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Climate and Average Weather Year Round at Prestwick Airport United Kingdom

At Prestwick Airport, the summers are cool; the winters are long, very cold, wet, and windy; and it is mostly cloudy year round. Over the course of the year, the temperature typically varies from 35°F to 65°F and is rarely below 24°F or above 73°F.

Based on the tourism score, the best time of year to visit Prestwick Airport for warm-weather activities is from late June to late August.

Climate at Prestwick Airport

very coldcoldcoolcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow49%49%29%29%overcastclearprecipitation: 4.2 inprecipitation: 4.2 in2.0 in2.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 5.6tourism score: 5.60.10.1
Prestwick Airport weather by month. Click on each chart for more information.

The warm season lasts for 3.1 months, from June 7 to September 12, with an average daily high temperature above 61°F. The hottest month of the year at Prestwick Airport is July, with an average high of 65°F and low of 52°F.

The cool season lasts for 4.0 months, from November 19 to March 18, with an average daily high temperature below 49°F. The coldest month of the year at Prestwick Airport is January, with an average low of 36°F and high of 45°F.

Average High and Low Temperature at Prestwick Airport

Average High and Low Temperature at Prestwick AirportwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 1745°FFeb 1745°FAug 165°FAug 165°F35°F35°F53°F53°FJun 761°FJun 761°FSep 1261°FSep 1261°FNov 1949°FNov 1949°F48°F48°F49°F49°F39°F39°F38°F38°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 45°F45°F48°F53°F58°F62°F65°F64°F60°F55°F49°F45°F
Temp. 40°F40°F43°F46°F51°F56°F59°F58°F55°F50°F45°F41°F
Low 36°F36°F37°F40°F44°F49°F52°F52°F49°F44°F40°F36°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 Prestwick Airport

Average Hourly Temperature at Prestwick 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 AMNowNowvery coldvery coldcoldcoolcool
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.

Victoria, Canada (4,438 miles away) is the far-away foreign place with temperatures most similar to Prestwick Airport (view comparison).

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At Prestwick 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 Prestwick Airport begins around April 14 and lasts for 5.8 months, ending around October 8.

The clearest month of the year at Prestwick Airport is July, during which on average the sky is clear, mostly clear, or partly cloudy 48% of the time.

The cloudier part of the year begins around October 8 and lasts for 6.2 months, ending around April 14.

The cloudiest month of the year at Prestwick Airport is January, during which on average the sky is overcast or mostly cloudy 70% of the time.

Cloud Cover Categories at Prestwick Airport

Cloud Cover Categories at Prestwick AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 1849%Jul 1849%Jan 2729%Jan 2729%Apr 1439%Apr 1439%Oct 839%Oct 839%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 70%67%66%61%55%54%52%54%57%63%67%68%
Clearer 30%33%34%39%45%46%48%46%43%37%33%32%

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

The wetter season lasts 5.3 months, from October 4 to March 13, with a greater than 42% chance of a given day being a wet day. The month with the most wet days at Prestwick Airport is January, with an average of 16.0 days with at least 0.04 inches of precipitation.

The drier season lasts 6.7 months, from March 13 to October 4. The month with the fewest wet days at Prestwick Airport is May, with an average of 9.9 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 Prestwick Airport is January, with an average of 15.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 53% on January 3.

Daily Chance of Precipitation at Prestwick Airport

Daily Chance of Precipitation at Prestwick AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 354%Jan 354%Apr 1830%Apr 1830%Oct 442%Oct 442%Mar 1342%Mar 1342%NowNowrain
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 15.6d12.2d12.2d9.6d9.9d9.8d11.1d11.9d11.7d14.2d14.4d14.7d
Mixed 0.4d0.2d0.2d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.2d
Any 16.0d12.4d12.4d9.6d9.9d9.8d11.1d11.9d11.7d14.2d14.4d14.9d

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. Prestwick Airport experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Prestwick Airport. The month with the most rain at Prestwick Airport is December, with an average rainfall of 4.1 inches.

The month with the least rain at Prestwick Airport is May, with an average rainfall of 2.0 inches.

Average Monthly Rainfall at Prestwick Airport

Average Monthly Rainfall at Prestwick AirportJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inDec 274.2 inDec 274.2 inApr 302.0 inApr 302.0 inOct 244.1 inOct 244.1 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 3.9″3.2″2.8″2.1″2.0″2.2″2.6″3.0″3.2″4.0″3.9″4.1″

The length of the day at Prestwick Airport varies extremely over the course of the year. In 2024, the shortest day is December 21, with 7 hours, 3 minutes of daylight; the longest day is June 20, with 17 hours, 30 minutes of daylight.

Hours of Daylight and Twilight at Prestwick Airport

Hours of Daylight and Twilight at Prestwick AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 9 minMar 2012 hr, 9 minMar 2017 hr, 30 minJun 2017 hr, 30 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 227 hr, 3 minDec 217 hr, 3 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 7.8h9.7h11.9h14.2h16.3h17.4h16.8h14.9h12.7h10.4h8.3h7.2h

The earliest sunrise is at 4:34 AM on June 17, and the latest sunrise is 4 hours, 12 minutes later at 8:46 AM on December 28. The earliest sunset is at 3:46 PM on December 14, and the latest sunset is 6 hours, 19 minutes later at 10:05 PM on June 23.

Daylight saving time (DST) is observed at Prestwick Airport during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

Sunrise & Sunset with Twilight and Daylight Saving Time at Prestwick Airport

Sunrise & Sunset with Twilight and Daylight Saving Time at Prestwick AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 174:34 AMJun 174:34 AM10:05 PMJun 2310:05 PMJun 23Dec 143:46 PMDec 143:46 PM8:46 AMDec 288:46 AMDec 28Mar 31DSTMar 31DSTDSTOct 27DSTOct 27daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 Prestwick Airport

Solar Elevation and Azimuth at Prestwick 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 AM00001010102020303040405000010101010202030304040501158NowNow
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 Prestwick 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.

The perceived humidity level at Prestwick Airport, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels at Prestwick Airport

Humidity Comfort Levels at Prestwick AirportJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 20%Feb 20%Jul 200%Jul 200%NowNowcomfortablecomfortabledrydryhumidhumid
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 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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 Prestwick Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.6 months, from October 10 to March 29, with average wind speeds of more than 13.6 miles per hour. The windiest month of the year at Prestwick Airport is January, with an average hourly wind speed of 16.4 miles per hour.

The calmer time of year lasts for 6.4 months, from March 29 to October 10. The calmest month of the year at Prestwick Airport is July, with an average hourly wind speed of 10.7 miles per hour.

Average Wind Speed at Prestwick Airport

Average Wind Speed at Prestwick AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphJan 716.6 mphJan 716.6 mphJul 2310.6 mphJul 2310.6 mphOct 1013.6 mphOct 1013.6 mphMar 2913.6 mphMar 2913.6 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) 16.415.414.612.511.710.910.711.212.713.814.615.3

The predominant average hourly wind direction at Prestwick Airport varies throughout the year.

The wind is most often from the west for 3.2 months, from January 14 to April 20; for 4.5 months, from May 13 to September 29; and for 2.2 months, from October 23 to December 30, with a peak percentage of 45% on July 2. The wind is most often from the south for 2.4 weeks, from April 20 to May 7; for 3.4 weeks, from September 29 to October 23; and for 2.1 weeks, from December 30 to January 14, with a peak percentage of 35% on October 11. The wind is most often from the east for 6.0 days, from May 7 to May 13, with a peak percentage of 29% on May 12.

Wind Direction at Prestwick Airport

Wind Direction at Prestwick AirportSWSWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
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).

Prestwick 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 some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.0 months, from June 29 to September 30, with an average temperature above 55°F. The month of the year at Prestwick Airport with the warmest water is August, with an average temperature of 58°F.

The time of year with cooler water lasts for 3.7 months, from January 3 to April 23, with an average temperature below 47°F. The month of the year at Prestwick Airport with the coolest water is March, with an average temperature of 45°F.

Average Water Temperature at Prestwick Airport

Average Water Temperature at Prestwick AirportwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec40°F40°F45°F45°F50°F50°F55°F55°F60°F60°FAug 1358°FAug 1358°F44°FMar 244°FMar 2Jun 2955°FJun 2955°FSep 3055°FSep 3055°FJan 347°FJan 347°FApr 2347°FApr 2347°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 46°F45°F45°F46°F50°F54°F57°F58°F57°F54°F51°F49°F

To characterize how pleasant the weather is at Prestwick 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 Prestwick Airport for general outdoor tourist activities is from late June to late August, with a peak score in the third week of July.

Tourism Score at Prestwick Airport

Tourism Score at Prestwick Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.65.60.10.1NowNowtemperaturetemperature 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 Prestwick Airport for hot-weather activities is from early July to early August, with a peak score in the third week of July.

Beach/Pool Score at Prestwick Airport

Beach/Pool Score at Prestwick AirportJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.90.90.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitation
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 Prestwick Airport typically lasts for 6.0 months (183 days), from around April 26 to around October 26, rarely starting before April 1 or after May 19, and rarely ending before September 29 or after November 24.

Time Spent in Various Temperature Bands and the Growing Season at Prestwick Airport

Time Spent in Various Temperature Bands and the Growing Season at Prestwick 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 2650%Apr 2650%Oct 2650%Oct 2690%May 1990%May 1990%Sep 2990%Sep 2910%Apr 110%Apr 110%Nov 2410%Nov 240%Feb 10%Feb 1Jul 21100%Jul 21100%very coldcoldcoolfreezingcomfortable
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 Prestwick Airport should appear around May 17, only rarely appearing before May 3 or after June 3.

Growing Degree Days at Prestwick Airport

Growing Degree Days at Prestwick AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°FMay 1790°FMay 1790°FSep 3900°FSep 3900°FDec 311,150°FDec 311,150°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 3.4 months, from April 29 to August 10, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest month of the year at Prestwick Airport is June, with an average of 5.7 kWh.

The darker period of the year lasts for 4.1 months, from October 20 to February 24, with an average daily incident shortwave energy per square meter below 1.4 kWh. The darkest month of the year at Prestwick Airport is December, with an average of 0.4 kWh.

Average Daily Incident Shortwave Solar Energy at Prestwick Airport

Average Daily Incident Shortwave Solar Energy at Prestwick AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJun 135.8 kWhJun 135.8 kWhDec 210.4 kWhDec 210.4 kWhApr 294.7 kWhApr 294.7 kWhAug 104.7 kWhAug 104.7 kWhOct 201.4 kWhOct 201.4 kWhFeb 241.4 kWhFeb 241.4 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) 0.51.22.33.95.35.75.54.43.01.60.70.4

For the purposes of this report, the geographical coordinates of Prestwick Airport are 55.509 deg latitude, -4.587 deg longitude, and 43 ft elevation.

The topography within 2 miles of Prestwick Airport contains only modest variations in elevation, with a maximum elevation change of 377 feet and an average elevation above sea level of 92 feet. Within 10 miles contains only modest variations in elevation (994 feet). Within 50 miles contains very significant variations in elevation (3,169 feet).

The area within 2 miles of Prestwick Airport is covered by artificial surfaces (40%), cropland (30%), and grassland (27%), within 10 miles by grassland (49%) and water (27%), and within 50 miles by grassland (34%) and water (25%).

This report illustrates the typical weather at Prestwick 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

Prestwick 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 Glasgow Airport, West Freugh, Campbeltown Airport, Machrihanish Meteorlogical Station, Oban Airport, Edinburgh Airport, Isle Of Man / Ronaldsway Airport, and Islay 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.