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Climate and Average Weather Year Round in Bellaire Ohio, United States

In Bellaire, the summers are warm, humid, and partly cloudy and the winters are very cold, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 23°F to 83°F and is rarely below 7°F or above 91°F.

Based on the tourism score, the best time of year to visit Bellaire for warm-weather activities is from mid June to mid September.

Climate in Bellaire

very coldcoldcoolwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow66%66%32%32%clearovercastprecipitation: 3.4 inprecipitation: 3.4 in2.0 in2.0 inmuggy: 45%muggy: 45%0%0%drydrytourism score: 6.7tourism score: 6.70.20.2
Bellaire weather by month. Click on each chart for more information.

The warm season lasts for 3.8 months, from May 25 to September 18, with an average daily high temperature above 74°F. The hottest month of the year in Bellaire is July, with an average high of 83°F and low of 65°F.

The cold season lasts for 3.0 months, from December 1 to March 2, with an average daily high temperature below 46°F. The coldest month of the year in Bellaire is January, with an average low of 24°F and high of 38°F.

Average High and Low Temperature in Bellaire

Average High and Low Temperature in BellairewarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2937°FJan 2937°FJul 1983°FJul 1983°F23°F23°F65°F65°FMay 2574°FMay 2574°FSep 1874°FSep 1874°FDec 146°FDec 146°FMar 246°FMar 246°F55°F55°F56°F56°F33°F33°F30°F30°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 38°F41°F52°F63°F72°F79°F83°F81°F75°F64°F52°F42°F
Temp. 30°F32°F41°F53°F62°F70°F73°F72°F65°F54°F44°F35°F
Low 24°F26°F34°F44°F53°F61°F65°F63°F56°F46°F37°F29°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 in Bellaire

Average Hourly Temperature in BellaireJanFebMarAprMayJunJulAugSepOctNovDec12 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 coldcoldcoldcoolcoolcomfortablewarmfreezing
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.

Nisipari, Romania (5,146 miles away); Maykop, Russia (5,540 miles); and Khasht’arrak, Armenia (5,900 miles) are the far-away foreign places with temperatures most similar to Bellaire (view comparison).

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In Bellaire, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Bellaire begins around May 29 and lasts for 5.4 months, ending around November 11.

The clearest month of the year in Bellaire is September, during which on average the sky is clear, mostly clear, or partly cloudy 65% of the time.

The cloudier part of the year begins around November 11 and lasts for 6.6 months, ending around May 29.

The cloudiest month of the year in Bellaire is January, during which on average the sky is overcast or mostly cloudy 67% of the time.

Cloud Cover Categories in Bellaire

Cloud Cover Categories in BellaireclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 2666%Aug 2666%Jan 1132%Jan 1132%May 2949%May 2949%Nov 1149%Nov 1149%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 67%64%57%53%52%46%39%35%35%42%53%64%
Clearer 33%36%43%47%48%54%61%65%65%58%47%36%

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

The wetter season lasts 5.2 months, from March 14 to August 20, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in Bellaire is June, with an average of 11.9 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from August 20 to March 14. The month with the fewest wet days in Bellaire is January, with an average of 6.6 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 in Bellaire is June, with an average of 11.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 41% on June 29.

Daily Chance of Precipitation in Bellaire

Daily Chance of Precipitation in BellairewetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 2941%Jun 2941%Jan 1420%Jan 1420%Mar 1430%Mar 1430%Aug 2030%Aug 2030%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 4.6d4.8d8.3d10.0d11.6d11.9d11.6d9.8d8.1d8.0d7.4d6.4d
Mixed 1.1d1.4d0.8d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.4d1.0d
Snow 0.9d0.6d0.4d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.4d
Any 6.6d6.8d9.4d10.1d11.6d11.9d11.6d9.8d8.1d8.0d7.9d7.9d

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. Bellaire experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Bellaire. The month with the most rain in Bellaire is June, with an average rainfall of 3.4 inches.

The month with the least rain in Bellaire is January, with an average rainfall of 1.7 inches.

Average Monthly Rainfall in Bellaire

Average Monthly Rainfall in BellaireJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inJun 43.4 inJun 43.4 inJan 261.7 inJan 261.7 inNov 252.6 inNov 252.6 inOct 102.4 inOct 102.4 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 1.7″1.8″2.5″2.8″3.3″3.4″3.1″2.8″2.5″2.4″2.6″2.3″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Bellaire experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 3.8 months, from November 30 to March 24, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Bellaire is February, with an average snowfall of 2.9 inches.

The snowless period of the year lasts for 8.2 months, from March 24 to November 30. The least snow falls around July 20, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Bellaire

Average Monthly Snowfall in BellairesnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inFeb 112.9 inFeb 112.9 inJul 200.0 inJul 200.0 inNov 301.0 inNov 301.0 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 2.7″2.9″1.6″0.1″0.0″0.0″0.0″0.0″0.0″0.0″0.5″1.6″

The length of the day in Bellaire varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 20 minutes of daylight; the longest day is June 20, with 15 hours, 1 minute of daylight.

Hours of Daylight and Twilight in Bellaire

Hours of Daylight and Twilight in BellaireJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 1912 hr, 7 minMar 1915 hr, 1 minJun 2015 hr, 1 minJun 2012 hr, 11 minSep 2212 hr, 11 minSep 229 hr, 20 minDec 219 hr, 20 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 9.7h10.7h12.0h13.3h14.4h15.0h14.7h13.7h12.4h11.1h10.0h9.4h

The earliest sunrise is at 5:53 AM on June 13, and the latest sunrise is 2 hours, 0 minutes later at 7:53 AM on November 2. The earliest sunset is at 4:57 PM on December 6, and the latest sunset is 3 hours, 59 minutes later at 8:56 PM on June 27.

Daylight saving time (DST) is observed in Bellaire 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 in Bellaire

Sunrise & Sunset with Twilight and Daylight Saving Time in BellaireJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:53 AMJun 135:53 AM8:56 PMJun 278:56 PMJun 27Dec 64:57 PMDec 64:57 PM7:53 AMNov 27:53 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 in Bellaire

Solar Elevation and Azimuth in BellaireJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM00010101010202020303030404040505060607000010101020202020303040405050602773NowNow
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 in Bellaire

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.

Bellaire experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.8 months, from May 27 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 11% of the time. The month with the most muggy days in Bellaire is July, with 13.4 days that are muggy or worse.

The least muggy day of the year is February 21, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Bellaire

Humidity Comfort Levels in BellairemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 210%Feb 210%Jul 1845%Jul 1845%May 2711%May 2711%Sep 1911%Sep 1911%NowNowoppressiveoppressivemuggymuggydrydryhumidhumidcomfortablecomfortable
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 0.0d0.0d0.0d0.0d1.8d8.1d13.4d11.2d4.5d0.4d0.0d0.0d

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 in Bellaire experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.4 months, from November 13 to April 27, with average wind speeds of more than 4.7 miles per hour. The windiest month of the year in Bellaire is February, with an average hourly wind speed of 6.1 miles per hour.

The calmer time of year lasts for 6.6 months, from April 27 to November 13. The calmest month of the year in Bellaire is August, with an average hourly wind speed of 3.2 miles per hour.

Average Wind Speed in Bellaire

Average Wind Speed in BellairewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mphFeb 256.1 mphFeb 256.1 mphAug 43.2 mphAug 43.2 mphNov 134.7 mphNov 134.7 mphApr 274.7 mphApr 274.7 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) 5.96.15.85.14.13.63.33.23.64.24.75.2

The predominant average hourly wind direction in Bellaire varies throughout the year.

The wind is most often from the south for 4.0 weeks, from May 19 to June 16 and for 2.7 months, from August 23 to November 15, with a peak percentage of 37% on November 14. The wind is most often from the west for 2.2 months, from June 16 to August 23 and for 6.1 months, from November 15 to May 19, with a peak percentage of 40% on July 12.

Wind Direction in Bellaire

Wind Direction in BellaireWSWSWJanFebMarAprMayJunJulAugSepOctNovDec0%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 in Bellaire 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 Bellaire for general outdoor tourist activities is from mid June to mid September, with a peak score in the last week of August.

Tourism Score in Bellaire

Tourism Score in Bellairebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.76.70.20.2NowNowtemperaturetemperature 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 Bellaire for hot-weather activities is from late June to late August, with a peak score in the last week of July.

Beach/Pool Score in Bellaire

Beach/Pool Score in Bellairebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.55.50.00.0NowNow 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 in Bellaire typically lasts for 6.1 months (187 days), from around April 17 to around October 21, rarely starting before March 29 or after May 11, and rarely ending before October 4 or after November 8.

Time Spent in Various Temperature Bands and the Growing Season in Bellaire

Time Spent in Various Temperature Bands and the Growing Season in Bellairegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1750%Apr 1750%Oct 2150%Oct 2190%May 1190%May 1190%Oct 490%Oct 410%Mar 2910%Mar 2910%Nov 810%Nov 80%Dec 180%Dec 18Jul 29100%Jul 29100%frigidfreezingvery coldcoolcomfortablewarmcoldhot
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 in Bellaire should appear around March 27, only rarely appearing before March 11 or after April 11.

Growing Degree Days in Bellaire

Growing Degree Days in BellaireJanFebMarAprMayJunJulAugSepOctNovDec0°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°FMar 2789°FMar 2789°FJun 13900°FJun 13900°FJul 241,800°FJul 241,800°FDec 313,415°FDec 313,415°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 4.0 months, from April 29 to August 28, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest month of the year in Bellaire is June, with an average of 6.7 kWh.

The darker period of the year lasts for 3.3 months, from November 5 to February 13, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest month of the year in Bellaire is December, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy in Bellaire

Average Daily Incident Shortwave Solar Energy in BellairebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 16.8 kWhJul 16.8 kWhDec 221.6 kWhDec 221.6 kWhApr 295.8 kWhApr 295.8 kWhAug 285.8 kWhAug 285.8 kWhNov 52.7 kWhNov 52.7 kWhFeb 132.7 kWhFeb 132.7 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) 1.92.74.05.36.16.76.66.15.03.62.31.7

For the purposes of this report, the geographical coordinates of Bellaire are 40.016 deg latitude, -80.742 deg longitude, and 663 ft elevation.

The topography within 2 miles of Bellaire contains significant variations in elevation, with a maximum elevation change of 689 feet and an average elevation above sea level of 884 feet. Within 10 miles contains significant variations in elevation (840 feet). Within 50 miles also contains very significant variations in elevation (1,102 feet).

The area within 2 miles of Bellaire is covered by trees (57%) and artificial surfaces (36%), within 10 miles by trees (75%) and artificial surfaces (12%), and within 50 miles by trees (74%) and cropland (18%).

This report illustrates the typical weather in Bellaire, 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

There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Bellaire.

For each station, the records are corrected for the elevation difference between that station and Bellaire according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Bellaire is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Bellaire and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Bellaire and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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.