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Climate and Average Weather Year Round in St. Louis Missouri, United States

In St. Louis, the summers are hot and muggy, the winters are very cold and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 25°F to 89°F and is rarely below 9°F or above 97°F.

Based on the tourism score, the best times of year to visit St. Louis for warm-weather activities are from late May to early July and from late July to late September.

Climate in St. Louis

very coldcoldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow71%71%46%46%clearovercastprecipitation: 4.1 inprecipitation: 4.1 in1.9 in1.9 inmuggy: 71%muggy: 71%0%0%drydrytourism score: 6.3tourism score: 6.30.30.3
St. Louis weather by month. Click on each chart for more information.

The hot season lasts for 3.7 months, from May 27 to September 18, with an average daily high temperature above 80°F. The hottest month of the year in St. Louis is July, with an average high of 89°F and low of 70°F.

The cold season lasts for 3.0 months, from November 27 to February 28, with an average daily high temperature below 50°F. The coldest month of the year in St. Louis is January, with an average low of 25°F and high of 41°F.

Average High and Low Temperature in St. Louis

Average High and Low Temperature in St. LouishotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2241°FJan 2241°FJul 1989°FJul 1989°F25°F25°F70°F70°FMay 2780°FMay 2780°FSep 1880°FSep 1880°FNov 2750°FNov 2750°FFeb 2850°FFeb 2850°F60°F60°F58°F58°F35°F35°F32°F32°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 41°F46°F57°F68°F77°F85°F89°F87°F80°F69°F56°F44°F
Temp. 32°F35°F46°F57°F66°F75°F79°F77°F69°F58°F46°F35°F
Low 25°F29°F38°F48°F57°F66°F70°F67°F59°F48°F38°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 St. Louis

Average Hourly Temperature in St. LouisJanFebMarAprMayJunJulAugSepOctNovDec12 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 coldcoldcoldcoolcoolcomfortablewarmhotfreezingwarm
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.

Mahdishahr, Iran (6,805 miles away) and Gwangju, South Korea (6,822 miles) are the far-away foreign places with temperatures most similar to St. Louis (view comparison).

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In St. Louis, 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 St. Louis begins around June 12 and lasts for 4.5 months, ending around October 29.

The clearest month of the year in St. Louis is August, during which on average the sky is clear, mostly clear, or partly cloudy 69% of the time.

The cloudier part of the year begins around October 29 and lasts for 7.5 months, ending around June 12.

The cloudiest month of the year in St. Louis is February, during which on average the sky is overcast or mostly cloudy 53% of the time.

Cloud Cover Categories in St. Louis

Cloud Cover Categories in St. LouisclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 2671%Aug 2671%Feb 1246%Feb 1246%Jun 1258%Jun 1258%Oct 2958%Oct 2958%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 52%53%50%45%48%41%34%31%31%37%46%52%
Clearer 48%47%50%55%52%59%66%69%69%63%54%48%

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

The wetter season lasts 5.3 months, from March 19 to August 28, with a greater than 28% chance of a given day being a wet day. The month with the most wet days in St. Louis is May, with an average of 12.1 days with at least 0.04 inches of precipitation.

The drier season lasts 6.7 months, from August 28 to March 19. The month with the fewest wet days in St. Louis is January, with an average of 5.2 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 St. Louis is May, with an average of 12.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 40% on May 20.

Daily Chance of Precipitation in St. Louis

Daily Chance of Precipitation in St. LouiswetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%May 2040%May 2040%Jan 1616%Jan 1616%Mar 1928%Mar 1928%Aug 2828%Aug 2828%NowNowrainsnowmixed
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 3.3d3.9d7.6d10.4d12.1d11.3d10.3d9.3d7.8d7.7d6.9d5.2d
Mixed 0.9d0.5d0.3d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.3d0.9d
Snow 1.0d1.0d0.3d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.6d
Any 5.2d5.3d8.1d10.4d12.1d11.3d10.3d9.3d7.8d7.7d7.2d6.6d

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. St. Louis experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in St. Louis. The month with the most rain in St. Louis is May, with an average rainfall of 4.1 inches.

The month with the least rain in St. Louis is January, with an average rainfall of 1.6 inches.

Average Monthly Rainfall in St. Louis

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″1.7″2.7″3.8″4.1″3.7″3.0″2.8″3.0″2.9″3.2″2.4″

Snowfall

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

The snowy period of the year lasts for 3.7 months, from November 25 to March 16, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in St. Louis is January, with an average snowfall of 3.2 inches.

The snowless period of the year lasts for 8.3 months, from March 16 to November 25. The least snow falls around July 22, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in St. Louis

Average Monthly Snowfall in St. LouissnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inJan 273.3 inJan 273.3 inJul 220.0 inJul 220.0 inNov 251.0 inNov 251.0 inMar 161.0 inMar 161.0 in
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 3.2″2.7″1.0″0.1″0.0″0.0″0.0″0.0″0.0″0.0″0.5″2.1″

The length of the day in St. Louis varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 28 minutes of daylight; the longest day is June 20, with 14 hours, 52 minutes of daylight.

Hours of Daylight and Twilight in St. Louis

Hours of Daylight and Twilight in St. LouisJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 1912 hr, 7 minMar 1914 hr, 52 minJun 2014 hr, 52 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 28 minDec 219 hr, 28 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 9.8h10.8h12.0h13.3h14.3h14.8h14.5h13.6h12.4h11.2h10.1h9.5h

The earliest sunrise is at 5:35 AM on June 13, and the latest sunrise is 1 hour, 54 minutes later at 7:29 AM on November 2. The earliest sunset is at 4:39 PM on December 7, and the latest sunset is 3 hours, 50 minutes later at 8:29 PM on June 27.

Daylight saving time (DST) is observed in St. Louis 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 St. Louis

Sunrise & Sunset with Twilight and Daylight Saving Time in St. LouisJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:35 AMJun 135:35 AM8:29 PMJun 278:29 PMJun 27Dec 74:39 PMDec 74:39 PM7:29 AMNov 27:29 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 St. Louis

Solar Elevation and Azimuth in St. LouisJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0001010101020202030303040404050506060700001010102020202030304040505060702875NowNow
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 St. Louis

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.

St. Louis experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.1 months, from May 18 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 18% of the time. The month with the most muggy days in St. Louis is July, with 21.2 days that are muggy or worse.

The month with the fewest muggy days in St. Louis is January, with 0.0 days that are muggy or worse.

Humidity Comfort Levels in St. Louis

Humidity Comfort Levels in St. LouismuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 280%Jan 280%Jul 2171%Jul 2171%May 1818%May 1818%Sep 2218%Sep 2218%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 0.0d0.0d0.0d0.4d5.0d14.7d21.2d18.4d8.1d1.2d0.1d0.0d

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 in St. Louis experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.2 months, from October 12 to May 17, with average wind speeds of more than 7.7 miles per hour. The windiest month of the year in St. Louis is March, with an average hourly wind speed of 9.8 miles per hour.

The calmer time of year lasts for 4.8 months, from May 17 to October 12. The calmest month of the year in St. Louis is August, with an average hourly wind speed of 5.8 miles per hour.

Average Wind Speed in St. Louis

Average Wind Speed in St. LouiswindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphMar 319.9 mphMar 319.9 mphJul 305.6 mphJul 305.6 mphOct 127.7 mphOct 127.7 mphMay 177.7 mphMay 177.7 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) 9.49.59.89.47.96.65.85.86.77.98.78.9

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

The wind is most often from the south for 10 months, from February 20 to December 21, with a peak percentage of 43% on June 21. The wind is most often from the west for 2.0 months, from December 21 to February 20, with a peak percentage of 34% on January 1.

Wind Direction in St. Louis

Wind Direction in St. LouisWSJanFebMarAprMayJunJulAugSepOctNovDec0%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).

To characterize how pleasant the weather is in St. Louis 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 St. Louis for general outdoor tourist activities are from late May to early July and from late July to late September, with a peak score in the first week of September.

Tourism Score in St. Louis

Tourism Score in St. Louisbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.36.30.30.35.95.95.75.7NowNowtemperaturetemperature 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 St. Louis for hot-weather activities is from mid June to late August, with a peak score in the last week of July.

Beach/Pool Score in St. Louis

Beach/Pool Score in St. Louisbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.06.00.00.0NowNowtemperaturetemperature 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 in St. Louis typically lasts for 6.8 months (209 days), from around April 3 to around October 29, rarely starting before March 16 or after April 21, and rarely ending before October 13 or after November 15.

Time Spent in Various Temperature Bands and the Growing Season in St. Louis

Time Spent in Various Temperature Bands and the Growing Season in St. Louisgrowing 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 2950%Oct 2990%Apr 2190%Apr 2190%Oct 1390%Oct 1310%Mar 1610%Mar 1610%Nov 1510%Nov 150%Dec 190%Dec 19Jul 15100%Jul 15100%freezingvery coldcomfortablewarmhotfrigidcoolcold
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 St. Louis should appear around March 16, only rarely appearing before March 1 or after April 4.

Growing Degree Days in St. Louis

Growing Degree Days in St. LouisJanFebMarAprMayJunJulAugSepOctNovDec0°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°F4,500°F4,500°FMar 1686°FMar 1686°FMay 29900°FMay 29900°FJul 51,800°FJul 51,800°FDec 314,331°FDec 314,331°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 4.1 months, from April 25 to August 28, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year in St. Louis is July, 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 in St. Louis is December, with an average of 2.1 kWh.

Average Daily Incident Shortwave Solar Energy in St. Louis

Average Daily Incident Shortwave Solar Energy in St. LouisbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 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 222.0 kWhDec 222.0 kWhApr 255.9 kWhApr 255.9 kWhAug 285.9 kWhAug 285.9 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) 2.43.24.45.66.36.76.86.25.23.92.72.1

For the purposes of this report, the geographical coordinates of St. Louis are 38.627 deg latitude, -90.198 deg longitude, and 463 ft elevation.

The topography within 2 miles of St. Louis contains only modest variations in elevation, with a maximum elevation change of 161 feet and an average elevation above sea level of 456 feet. Within 10 miles also contains only modest variations in elevation (308 feet). Within 50 miles contains only modest variations in elevation (892 feet).

The area within 2 miles of St. Louis is covered by artificial surfaces (88%) and water (12%), within 10 miles by artificial surfaces (66%) and cropland (22%), and within 50 miles by cropland (54%) and trees (31%).

This report illustrates the typical weather in St. Louis, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in St. Louis.

For each station, the records are corrected for the elevation difference between that station and St. Louis 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 St. Louis is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between St. Louis 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 St. Louis 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.