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Climate and Average Weather Year Round at Westover Air Reserve Base / Metropolitan Airport Massachusetts, United States

At Westover Air Reserve Base / Metropolitan Airport, the summers are warm and wet, the winters are freezing and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 16°F to 84°F and is rarely below -0°F or above 92°F.

Based on the tourism score, the best time of year to visit Westover Air Reserve Base / Metropolitan Airport for warm-weather activities is from mid June to mid September.

Climate at Westover Air Reserve Base / Metropolitan Airport

very coldcoldcoolwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow65%65%46%46%clearovercastprecipitation: 4.0 inprecipitation: 4.0 in2.7 in2.7 inmuggy: 37%muggy: 37%0%0%drydrytourism score: 6.3tourism score: 6.30.10.1
Westover Air Reserve Base / Metropolitan Airport weather by month. Click on each chart for more information.

The warm season lasts for 3.6 months, from May 28 to September 15, with an average daily high temperature above 74°F. The hottest month of the year at Westover Air Reserve Base / Metropolitan Airport is July, with an average high of 83°F and low of 61°F.

The cold season lasts for 3.4 months, from November 30 to March 10, with an average daily high temperature below 44°F. The coldest month of the year at Westover Air Reserve Base / Metropolitan Airport is January, with an average low of 18°F and high of 34°F.

Average High and Low Temperature at Westover Air Reserve Base / Metropolitan Airport

Average High and Low Temperature at Westover Air Reserve Base / Metropolitan AirportwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2934°FJan 2934°FJul 2084°FJul 2084°F16°F16°F62°F62°FMay 2874°FMay 2874°FSep 1574°FSep 1574°FNov 3044°FNov 3044°FMar 1044°FMar 1044°F51°F51°F52°F52°F28°F28°F25°F25°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 34°F37°F47°F60°F70°F78°F83°F81°F73°F62°F50°F39°F
Temp. 25°F28°F36°F48°F59°F67°F72°F70°F62°F51°F41°F31°F
Low 18°F19°F28°F38°F47°F56°F61°F59°F52°F41°F32°F24°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 Westover Air Reserve Base / Metropolitan Airport

Average Hourly Temperature at Westover Air Reserve Base / Metropolitan 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 AMNowNowfreezingfreezingvery coldvery coldcoldcoldcoolcomfortablewarmcomfortablefreezing
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.

Tegh, Armenia (5,626 miles away) is the far-away foreign place with temperatures most similar to Westover Air Reserve Base / Metropolitan Airport (view comparison).

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Compare Westover Air Reserve Base / Metropolitan Airport to another city:

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At Westover Air Reserve Base / Metropolitan 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 Westover Air Reserve Base / Metropolitan Airport begins around June 24 and lasts for 4.4 months, ending around November 5.

The clearest month of the year at Westover Air Reserve Base / Metropolitan Airport is September, during which on average the sky is clear, mostly clear, or partly cloudy 63% of the time.

The cloudier part of the year begins around November 5 and lasts for 7.6 months, ending around June 24.

The cloudiest month of the year at Westover Air Reserve Base / Metropolitan Airport is February, during which on average the sky is overcast or mostly cloudy 53% of the time.

Cloud Cover Categories at Westover Air Reserve Base / Metropolitan Airport

Cloud Cover Categories at Westover Air Reserve Base / Metropolitan AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 565%Sep 565%Jan 346%Jan 346%Jun 2455%Jun 2455%Nov 555%Nov 555%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 53%53%53%52%52%48%42%38%37%40%48%53%
Clearer 47%47%47%48%48%52%58%62%63%60%52%47%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Westover Air Reserve Base / Metropolitan Airport varies throughout the year.

The wetter season lasts 3.5 months, from May 1 to August 18, with a greater than 29% chance of a given day being a wet day. The month with the most wet days at Westover Air Reserve Base / Metropolitan Airport is June, with an average of 10.7 days with at least 0.04 inches of precipitation.

The drier season lasts 8.5 months, from August 18 to May 1. The month with the fewest wet days at Westover Air Reserve Base / Metropolitan Airport is February, with an average of 6.7 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. Based on this categorization, the most common form of precipitation at Westover Air Reserve Base / Metropolitan Airport changes throughout the year.

Rain alone is the most common for 11 months, from January 31 to January 6. The month with the most days of rain alone at Westover Air Reserve Base / Metropolitan Airport is June, with an average of 10.7 days.

Snow alone is the most common for 2.9 weeks, from January 6 to January 26. The month with the most days of snow alone at Westover Air Reserve Base / Metropolitan Airport is January, with an average of 2.7 days.

Mixed snow and rain is the most common for 5.0 days, from January 26 to January 31. The month with the most days of mixed snow and rain at Westover Air Reserve Base / Metropolitan Airport is February, with an average of 2.0 days.

Daily Chance of Precipitation at Westover Air Reserve Base / Metropolitan Airport

Daily Chance of Precipitation at Westover Air Reserve Base / Metropolitan AirportrainJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%May 2937%May 2937%Jan 2921%Jan 2921%Aug 1829%Aug 1829%NowNowsnowrainmixed
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 2.5d2.7d5.4d7.7d10.2d10.7d10.7d9.4d8.2d7.7d6.3d4.1d
Mixed 2.1d2.0d1.7d0.5d0.0d0.0d0.0d0.0d0.0d0.2d1.1d2.1d
Snow 2.7d1.9d1.1d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.3d2.0d
Any 7.3d6.7d8.3d8.3d10.2d10.7d10.7d9.4d8.2d8.0d7.7d8.2d

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. Westover Air Reserve Base / Metropolitan Airport experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Westover Air Reserve Base / Metropolitan Airport. The month with the most rain at Westover Air Reserve Base / Metropolitan Airport is October, with an average rainfall of 3.8 inches.

The month with the least rain at Westover Air Reserve Base / Metropolitan Airport is January, with an average rainfall of 1.6 inches.

Average Monthly Rainfall at Westover Air Reserve Base / Metropolitan Airport

Average Monthly Rainfall at Westover Air Reserve Base / Metropolitan AirportJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inOct 34.0 inOct 34.0 inJan 221.6 inJan 221.6 inJun 23.9 inJun 23.9 inAug 23.6 inAug 23.6 inApr 153.4 inApr 153.4 inNowNow
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 1.6″1.8″2.8″3.4″3.5″3.6″3.3″3.4″3.6″3.8″3.3″2.4″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Westover Air Reserve Base / Metropolitan Airport experiences extreme seasonal variation in monthly snowfall.

The snowy period of the year lasts for 5.5 months, from October 30 to April 15, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Westover Air Reserve Base / Metropolitan Airport is January, with an average snowfall of 11.6 inches.

The snowless period of the year lasts for 6.5 months, from April 15 to October 30. The least snow falls around July 18, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Westover Air Reserve Base / Metropolitan Airport

Average Monthly Snowfall at Westover Air Reserve Base / Metropolitan AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inJan 2412.0 inJan 2412.0 inJul 180.0 inJul 180.0 inOct 301.0 inOct 301.0 inApr 151.0 inApr 151.0 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 11.6″10.7″5.9″1.0″0.0″0.0″0.0″0.0″0.0″0.3″2.8″8.8″

The length of the day at Westover Air Reserve Base / Metropolitan Airport varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 6 minutes of daylight; the longest day is June 20, with 15 hours, 16 minutes of daylight.

Hours of Daylight and Twilight at Westover Air Reserve Base / Metropolitan Airport

Hours of Daylight and Twilight at Westover Air Reserve Base / Metropolitan AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 16 minJun 2015 hr, 16 minJun 2012 hr, 11 minSep 2212 hr, 11 minSep 229 hr, 6 minDec 219 hr, 6 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 9.5h10.6h12.0h13.4h14.6h15.2h14.9h13.8h12.4h11.0h9.8h9.2h

The earliest sunrise is at 5:13 AM on June 14, and the latest sunrise is 2 hours, 12 minutes later at 7:25 AM on November 2. The earliest sunset is at 4:17 PM on December 8, and the latest sunset is 4 hours, 13 minutes later at 8:30 PM on June 26.

Daylight saving time (DST) is observed at Westover Air Reserve Base / Metropolitan 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 Westover Air Reserve Base / Metropolitan Airport

Sunrise & Sunset with Twilight and Daylight Saving Time at Westover Air Reserve Base / Metropolitan AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:13 AMJun 145:13 AM8:30 PMJun 268:30 PMJun 26Dec 84:17 PMDec 84:17 PM7:25 AMNov 27:25 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 Westover Air Reserve Base / Metropolitan Airport

Solar Elevation and Azimuth at Westover Air Reserve Base / Metropolitan 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 AM0001010101020202030303040405050606000010101020202020303040405050602471NowNow
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 Westover Air Reserve Base / Metropolitan 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.

Westover Air Reserve Base / Metropolitan Airport experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.5 months, from June 5 to September 20, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The month with the most muggy days at Westover Air Reserve Base / Metropolitan Airport is July, with 10.3 days that are muggy or worse.

The least muggy day of the year is February 20, when muggy conditions are essentially unheard of.

Humidity Comfort Levels at Westover Air Reserve Base / Metropolitan Airport

Humidity Comfort Levels at Westover Air Reserve Base / Metropolitan AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 200%Feb 200%Jul 2937%Jul 2937%Jun 59%Jun 59%Sep 209%Sep 209%NowNowmuggymuggydrydrycomfortablecomfortableoppressiveoppressivehumidhumid
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 0.0d0.0d0.0d0.0d0.8d4.8d10.3d8.6d3.4d0.5d0.0d0.0d

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 Westover Air Reserve Base / Metropolitan Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.3 months, from November 16 to April 25, with average wind speeds of more than 5.0 miles per hour. The windiest month of the year at Westover Air Reserve Base / Metropolitan Airport is February, with an average hourly wind speed of 6.4 miles per hour.

The calmer time of year lasts for 6.7 months, from April 25 to November 16. The calmest month of the year at Westover Air Reserve Base / Metropolitan Airport is August, with an average hourly wind speed of 3.6 miles per hour.

Average Wind Speed at Westover Air Reserve Base / Metropolitan Airport

Average Wind Speed at Westover Air Reserve Base / Metropolitan AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mphFeb 266.5 mphFeb 266.5 mphAug 123.5 mphAug 123.5 mphNov 165.0 mphNov 165.0 mphApr 255.0 mphApr 255.0 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) 6.16.46.25.44.43.93.73.64.04.55.05.5

The predominant average hourly wind direction at Westover Air Reserve Base / Metropolitan Airport is from the west throughout the year.

Wind Direction at Westover Air Reserve Base / Metropolitan Airport

Wind Direction at Westover Air Reserve Base / Metropolitan AirportJanFebMarAprMayJunJulAugSepOctNovDec0%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).

To characterize how pleasant the weather is at Westover Air Reserve Base / Metropolitan 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 time of year to visit Westover Air Reserve Base / Metropolitan Airport for general outdoor tourist activities is from mid June to mid September, with a peak score in the third week of August.

Tourism Score at Westover Air Reserve Base / Metropolitan Airport

Tourism Score at Westover Air Reserve Base / Metropolitan Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.36.30.10.1NowNowtemperaturetemperature 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 Westover Air Reserve Base / Metropolitan Airport for hot-weather activities is from late June to mid August, with a peak score in the last week of July.

Beach/Pool Score at Westover Air Reserve Base / Metropolitan Airport

Beach/Pool Score at Westover Air Reserve Base / Metropolitan Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.25.20.00.0NowNowtemperaturetemperature 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 Westover Air Reserve Base / Metropolitan Airport typically lasts for 5.0 months (153 days), from around May 6 to around October 6, rarely starting before April 19 or after May 22, and rarely ending before September 20 or after October 22.

Time Spent in Various Temperature Bands and the Growing Season at Westover Air Reserve Base / Metropolitan Airport

Time Spent in Various Temperature Bands and the Growing Season at Westover Air Reserve Base / Metropolitan Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 650%May 650%Oct 650%Oct 650%May 2290%May 2290%Sep 2090%Sep 2090%Apr 1910%Apr 1910%Oct 2210%Oct 2210%0%Feb 170%Feb 17Jul 20100%Jul 20100%NowNowfrigidfreezingvery 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 Westover Air Reserve Base / Metropolitan Airport should appear around April 19, only rarely appearing before April 7 or after April 29.

Growing Degree Days at Westover Air Reserve Base / Metropolitan Airport

Growing Degree Days at Westover Air Reserve Base / Metropolitan AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FApr 1990°FApr 1990°FJun 27900°FJun 27900°FAug 81,800°FAug 81,800°FDec 312,842°FDec 312,842°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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.6 months, from May 1 to August 20, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest month of the year at Westover Air Reserve Base / Metropolitan Airport is June, with an average of 6.7 kWh.

The darker period of the year lasts for 3.3 months, from November 2 to February 11, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest month of the year at Westover Air Reserve Base / Metropolitan Airport is December, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy at Westover Air Reserve Base / Metropolitan Airport

Average Daily Incident Shortwave Solar Energy at Westover Air Reserve Base / Metropolitan AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 296.9 kWhJun 296.9 kWhDec 221.6 kWhDec 221.6 kWhMay 15.8 kWhMay 15.8 kWhAug 205.8 kWhAug 205.8 kWhNov 22.7 kWhNov 22.7 kWhFeb 112.7 kWhFeb 112.7 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) 1.92.84.05.36.16.76.65.94.83.42.21.7

For the purposes of this report, the geographical coordinates of Westover Air Reserve Base / Metropolitan Airport are 42.193 deg latitude, -72.536 deg longitude, and 236 ft elevation.

The topography within 2 miles of Westover Air Reserve Base / Metropolitan Airport contains only modest variations in elevation, with a maximum elevation change of 148 feet and an average elevation above sea level of 232 feet. Within 10 miles contains only modest variations in elevation (1,148 feet). Within 50 miles contains very significant variations in elevation (3,468 feet).

The area within 2 miles of Westover Air Reserve Base / Metropolitan Airport is covered by artificial surfaces (72%), cropland (15%), and trees (13%), within 10 miles by trees (54%) and artificial surfaces (39%), and within 50 miles by trees (83%) and artificial surfaces (11%).

This report illustrates the typical weather at Westover Air Reserve Base / Metropolitan 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

Westover Air Reserve Base / Metropolitan 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 Barnes Municipal Airport; Bradley International Airport; Orange Municipal Airport; Hartford-Brainard Airport; Windham Airport; Worcester, Worcester Regional Airport; Dillant-Hopkins Airport; and Meriden Markham Municipal 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.