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Climate and Average Weather Year Round at Baltimore-Washington International Airport United States

At Baltimore-Washington International Airport, the summers are warm and humid; the winters are very cold, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 26°F to 87°F and is rarely below 14°F or above 95°F.

Based on the tourism score, the best times of year to visit Baltimore-Washington International Airport for warm-weather activities are from mid to late June and from early August to late September.

Climate at Baltimore-Washington International Airport

very coldcoldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow65%65%48%48%clearovercastprecipitation: 3.6 inprecipitation: 3.6 in2.6 in2.6 inmuggy: 62%muggy: 62%0%0%drydrytourism score: 6.6tourism score: 6.60.30.3
Baltimore-Washington International Airport weather by month. Click on each chart for more information.

The hot season lasts for 3.5 months, from May 29 to September 15, with an average daily high temperature above 78°F. The hottest month of the year at Baltimore-Washington International Airport is July, with an average high of 87°F and low of 69°F.

The cold season lasts for 3.2 months, from November 30 to March 4, with an average daily high temperature below 51°F. The coldest month of the year at Baltimore-Washington International Airport is January, with an average low of 27°F and high of 42°F.

Average High and Low Temperature at Baltimore-Washington International Airport

Average High and Low Temperature at Baltimore-Washington International AirporthotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 3042°FJan 3042°FJul 2087°FJul 2087°F26°F26°F70°F70°FMay 2978°FMay 2978°FSep 1578°FSep 1578°FNov 3051°FNov 3051°FMar 451°FMar 451°F60°F60°F61°F61°F35°F35°F33°F33°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 42°F45°F55°F65°F75°F83°F87°F85°F78°F67°F56°F47°F
Temp. 34°F36°F44°F55°F64°F73°F78°F76°F69°F57°F47°F38°F
Low 27°F29°F37°F46°F55°F64°F69°F67°F60°F49°F39°F32°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature at Baltimore-Washington International Airport

Average Hourly Temperature at Baltimore-Washington International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingvery coldvery coldcoldcoldcoolcoolcomfortablewarmhotvery cold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Tbilisi, Georgia (5,758 miles away) is the far-away foreign place with temperatures most similar to Baltimore-Washington International Airport (view comparison).

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At Baltimore-Washington International Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Baltimore-Washington International Airport begins around June 30 and lasts for 4.4 months, ending around November 12.

The clearest month of the year at Baltimore-Washington International Airport is September, during which on average the sky is clear, mostly clear, or partly cloudy 64% of the time.

The cloudier part of the year begins around November 12 and lasts for 7.6 months, ending around June 30.

The cloudiest month of the year at Baltimore-Washington International Airport is January, during which on average the sky is overcast or mostly cloudy 51% of the time.

Cloud Cover Categories at Baltimore-Washington International Airport

Cloud Cover Categories at Baltimore-Washington International AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 2265%Sep 2265%Jan 548%Jan 548%Jun 3056%Jun 3056%Nov 1257%Nov 1257%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 51%51%49%48%48%45%41%37%36%37%44%50%
Clearer 49%49%51%52%52%55%59%63%64%63%56%50%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Baltimore-Washington International Airport varies throughout the year.

The wetter season lasts 4.5 months, from April 9 to August 24, with a greater than 29% chance of a given day being a wet day. The month with the most wet days at Baltimore-Washington International Airport is July, with an average of 11.4 days with at least 0.04 inches of precipitation.

The drier season lasts 7.5 months, from August 24 to April 9. The month with the fewest wet days at Baltimore-Washington International Airport is January, with an average of 6.9 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Baltimore-Washington International Airport is July, with an average of 11.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 38% on July 13.

Daily Chance of Precipitation at Baltimore-Washington International Airport

Daily Chance of Precipitation at Baltimore-Washington International AirportwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 1338%Jul 1338%Jan 2821%Jan 2821%Apr 929%Apr 929%Aug 2429%Aug 2429%NowNowrainmixedsnow
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 4.3d4.3d7.2d8.8d10.4d10.7d11.4d10.0d7.8d7.2d6.6d5.9d
Mixed 1.4d1.5d0.7d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.2d1.0d
Snow 1.2d1.0d0.3d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.5d
Any 6.9d6.8d8.2d8.8d10.4d10.7d11.4d10.0d7.8d7.2d6.9d7.5d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Baltimore-Washington International Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Baltimore-Washington International Airport. The month with the most rain at Baltimore-Washington International Airport is May, with an average rainfall of 3.5 inches.

The month with the least rain at Baltimore-Washington International Airport is January, with an average rainfall of 2.0 inches.

Average Monthly Rainfall at Baltimore-Washington International Airport

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 2.0″2.0″3.1″3.3″3.5″3.4″3.2″3.2″3.5″3.3″3.1″2.8″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Baltimore-Washington International Airport experiences significant seasonal variation in monthly snowfall.

The snowy period of the year lasts for 4.1 months, from November 21 to March 24, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Baltimore-Washington International Airport is February, with an average snowfall of 6.6 inches.

The snowless period of the year lasts for 7.9 months, from March 24 to November 21. The least snow falls around July 10, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Baltimore-Washington International Airport

Average Monthly Snowfall at Baltimore-Washington International AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 inFeb 57.1 inFeb 57.1 inJul 100.0 inJul 100.0 inNov 211.0 inNov 211.0 inMar 241.0 inMar 241.0 inNowNow
The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 6.2″6.6″1.9″0.0″0.0″0.0″0.0″0.0″0.0″0.0″0.6″3.1″

The length of the day at Baltimore-Washington International Airport varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 25 minutes of daylight; the longest day is June 20, with 14 hours, 56 minutes of daylight.

Hours of Daylight and Twilight at Baltimore-Washington International Airport

Hours of Daylight and Twilight at Baltimore-Washington International AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 1912 hr, 7 minMar 1914 hr, 56 minJun 2014 hr, 56 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 25 minDec 219 hr, 25 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.8h10.7h12.0h13.3h14.3h14.9h14.6h13.6h12.4h11.1h10.0h9.5h

The earliest sunrise is at 5:39 AM on June 13, and the latest sunrise is 1 hour, 56 minutes later at 7:36 AM on November 2. The earliest sunset is at 4:43 PM on December 7, and the latest sunset is 3 hours, 53 minutes later at 8:37 PM on June 27.

Daylight saving time (DST) is observed at Baltimore-Washington International Airport during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time at Baltimore-Washington International Airport

Sunrise & Sunset with Twilight and Daylight Saving Time at Baltimore-Washington International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:39 AMJun 135:39 AM8:37 PMJun 278:37 PMJun 27Dec 74:43 PMDec 74:43 PM7:36 AMNov 27:36 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth at Baltimore-Washington International Airport

Solar Elevation and Azimuth at Baltimore-Washington International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0001010101020202030303040404050506060700001010102020202030304040505060702774NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases at Baltimore-Washington International Airport

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Baltimore-Washington International Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.0 months, from May 25 to September 26, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The month with the most muggy days at Baltimore-Washington International Airport is July, with 17.8 days that are muggy or worse.

The month with the fewest muggy days at Baltimore-Washington International Airport is February, with 0.0 days that are muggy or worse.

Humidity Comfort Levels at Baltimore-Washington International Airport

Humidity Comfort Levels at Baltimore-Washington International AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 100%Feb 100%Aug 162%Aug 162%May 2515%May 2515%Sep 2615%Sep 2615%NowNowoppressiveoppressivemuggymuggydrydryhumidhumidcomfortablecomfortablemiserablemiserable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.2d3.0d11.0d17.8d15.9d7.6d1.5d0.1d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Baltimore-Washington International Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.7 months, from October 17 to May 8, with average wind speeds of more than 8.8 miles per hour. The windiest month of the year at Baltimore-Washington International Airport is March, with an average hourly wind speed of 10.7 miles per hour.

The calmer time of year lasts for 5.3 months, from May 8 to October 17. The calmest month of the year at Baltimore-Washington International Airport is July, with an average hourly wind speed of 6.8 miles per hour.

Average Wind Speed at Baltimore-Washington International Airport

Average Wind Speed at Baltimore-Washington International AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mphFeb 2610.9 mphFeb 2610.9 mphJul 316.6 mphJul 316.6 mphOct 178.8 mphOct 178.8 mphMay 88.8 mphMay 88.8 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 10.410.710.79.98.47.46.86.87.88.89.69.8

The predominant average hourly wind direction at Baltimore-Washington International Airport varies throughout the year.

The wind is most often from the north for 3.0 weeks, from March 6 to March 27, with a peak percentage of 32% on March 9. The wind is most often from the west for 1.2 months, from March 27 to May 3; for 3.4 weeks, from June 28 to July 22; and for 4.9 months, from October 10 to March 6, with a peak percentage of 35% on July 5. The wind is most often from the south for 1.8 months, from May 3 to June 28 and for 2.6 months, from July 22 to October 10, with a peak percentage of 35% on August 15.

Wind Direction at Baltimore-Washington International Airport

Wind Direction at Baltimore-Washington International AirportWNWSWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Baltimore-Washington International Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences extreme seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from June 22 to October 1, with an average temperature above 69°F. The month of the year at Baltimore-Washington International Airport with the warmest water is August, with an average temperature of 76°F.

The time of year with cooler water lasts for 3.6 months, from December 18 to April 5, with an average temperature below 44°F. The month of the year at Baltimore-Washington International Airport with the coolest water is February, with an average temperature of 36°F.

Average Water Temperature at Baltimore-Washington International Airport

Average Water Temperature at Baltimore-Washington International AirportwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°FAug 1077°FAug 1077°F36°FFeb 1036°FFeb 10Jun 2269°FJun 2269°FOct 169°FOct 169°FDec 1844°FDec 1844°FApr 544°FApr 544°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 38°F36°F40°F47°F56°F67°F74°F76°F72°F64°F54°F45°F

To characterize how pleasant the weather is at Baltimore-Washington International Airport throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Baltimore-Washington International Airport for general outdoor tourist activities are from mid to late June and from early August to late September, with a peak score in the first week of September.

Tourism Score at Baltimore-Washington International Airport

Tourism Score at Baltimore-Washington International Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.60.30.36.06.05.75.7NowNow cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Baltimore-Washington International Airport for hot-weather activities is from late June to early September, with a peak score in the last week of July.

Beach/Pool Score at Baltimore-Washington International Airport

Beach/Pool Score at Baltimore-Washington International Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.16.10.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Baltimore-Washington International Airport typically lasts for 6.9 months (211 days), from around April 3 to around October 31, rarely starting before March 18 or after April 19, and rarely ending before October 15 or after November 16.

Time Spent in Various Temperature Bands and the Growing Season at Baltimore-Washington International Airport

Time Spent in Various Temperature Bands and the Growing Season at Baltimore-Washington International Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 350%Apr 350%Oct 3150%Oct 3190%Apr 1990%Apr 1990%Oct 1590%Oct 1510%Mar 1810%Mar 1810%Nov 1610%Nov 160%Jan 290%Jan 29Jul 14100%Jul 14100%freezingvery coldcoldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Baltimore-Washington International Airport should appear around March 23, only rarely appearing before March 7 or after April 10.

Growing Degree Days at Baltimore-Washington International Airport

Growing Degree Days at Baltimore-Washington International AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°FMar 2385°FMar 2385°FJun 6900°FJun 6900°FJul 131,800°FJul 131,800°FDec 314,032°FDec 314,032°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.8 months, from April 27 to August 22, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year at Baltimore-Washington International Airport is June, with an average of 6.8 kWh.

The darker period of the year lasts for 3.1 months, from November 5 to February 9, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest month of the year at Baltimore-Washington International Airport is December, with an average of 2.0 kWh.

Average Daily Incident Shortwave Solar Energy at Baltimore-Washington International Airport

Average Daily Incident Shortwave Solar Energy at Baltimore-Washington International AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 226.9 kWhJun 226.9 kWhDec 222.0 kWhDec 222.0 kWhApr 275.9 kWhApr 275.9 kWhAug 225.9 kWhAug 225.9 kWhNov 53.0 kWhNov 53.0 kWhFeb 93.0 kWhFeb 93.0 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 2.33.14.35.56.46.86.76.15.13.82.62.0

For the purposes of this report, the geographical coordinates of Baltimore-Washington International Airport are 39.175 deg latitude, -76.668 deg longitude, and 141 ft elevation.

The topography within 2 miles of Baltimore-Washington International Airport contains only modest variations in elevation, with a maximum elevation change of 180 feet and an average elevation above sea level of 116 feet. Within 10 miles contains only modest variations in elevation (558 feet). Within 50 miles contains significant variations in elevation (1,732 feet).

The area within 2 miles of Baltimore-Washington International Airport is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (67%) and trees (22%), and within 50 miles by cropland (34%) and trees (30%).

This report illustrates the typical weather at Baltimore-Washington International Airport, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Baltimore-Washington International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Tipton Airport; Baltimore, Inner Harbor; Annapolis, United States Naval Academy; College Park Airport; Martin State Airport; Washington Executive Airport/Hyde Field; Thomas Point Coast Guard Station; and Ronald Reagan Washington National Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.