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Climate and Average Weather Year Round at Mahshahr Airport Iran

At Mahshahr Airport, the summers are long, sweltering, arid, and clear and the winters are cool, dry, and mostly clear. Over the course of the year, the temperature typically varies from 47°F to 113°F and is rarely below 39°F or above 117°F.

Based on the beach/pool score, the best times of year to visit Mahshahr Airport for hot-weather activities are from early April to early May and from late September to late October.

Climate at Mahshahr Airport

coolwarmhotswelteringhotJanFebMarAprMayJunJulAugSepOctNovDecNowNow99%99%66%66%clearprecipitation: 0.9 inprecipitation: 0.9 in0.0 in0.0 inmuggy: 18%muggy: 18%0%0%drydrybeach/pool score: 7.9beach/pool score: 7.90.60.6
Mahshahr Airport weather by month. Click on each chart for more information.

The hot season lasts for 4.2 months, from May 18 to September 24, with an average daily high temperature above 103°F. The hottest month of the year at Mahshahr Airport is July, with an average high of 112°F and low of 85°F.

The cool season lasts for 3.3 months, from November 27 to March 3, with an average daily high temperature below 74°F. The coldest month of the year at Mahshahr Airport is January, with an average low of 47°F and high of 64°F.

Average High and Low Temperature at Mahshahr Airport

Average High and Low Temperature at Mahshahr AirporthotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°F110°F110°F120°F120°FJan 1264°FJan 1264°FJul 19113°FJul 19113°F47°F47°F85°F85°FMay 18103°FMay 18103°FSep 24103°FSep 24103°FNov 2774°FNov 2774°FMar 374°FMar 374°F77°F77°F74°F74°F53°F53°F54°F54°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 64°F69°F78°F89°F102°F110°F112°F110°F105°F94°F79°F67°F
Temp. 55°F59°F67°F79°F90°F96°F99°F97°F91°F81°F67°F58°F
Low 47°F50°F57°F67°F77°F81°F85°F84°F76°F68°F57°F49°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 Mahshahr Airport

Average Hourly Temperature at Mahshahr 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 AMNowNowcoldcoldcoldcoolcoolwarmwarmhotswelteringcomfortablecomfortablecold
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.

Needles, California, United States (7,805 miles away) is the far-away foreign place with temperatures most similar to Mahshahr Airport (view comparison).

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At Mahshahr Airport, 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 at Mahshahr Airport begins around May 22 and lasts for 4.9 months, ending around October 19.

The clearest month of the year at Mahshahr Airport is September, during which on average the sky is clear, mostly clear, or partly cloudy 97% of the time.

The cloudier part of the year begins around October 19 and lasts for 7.1 months, ending around May 22.

The cloudiest month of the year at Mahshahr Airport is December, during which on average the sky is overcast or mostly cloudy 33% of the time.

Cloud Cover Categories at Mahshahr Airport

Cloud Cover Categories at Mahshahr AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 1299%Sep 1299%Apr 2366%Apr 2366%May 2282%May 2282%Oct 1982%Oct 1982%NowNowclearovercastmostly clearpartly cloudymostly cloudy
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 29%27%30%33%22%3%3%5%3%16%31%33%
Clearer 71%73%70%67%78%97%97%95%97%84%69%67%

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

The wetter season lasts 5.2 months, from November 5 to April 12, with a greater than 6% chance of a given day being a wet day. The month with the most wet days at Mahshahr Airport is December, with an average of 3.2 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from April 12 to November 5. The month with the fewest wet days at Mahshahr Airport is September, with an average of 0.1 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 Mahshahr Airport is December, with an average of 3.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 11% on December 8.

Daily Chance of Precipitation at Mahshahr Airport

Daily Chance of Precipitation at Mahshahr AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 811%Dec 811%Sep 70%Sep 70%Nov 56%Nov 56%Apr 126%Apr 126%rain
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 3.0d1.9d2.4d1.6d0.6d0.4d0.3d0.2d0.1d0.7d2.3d3.2d

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. Mahshahr Airport experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 3.0 months, from November 10 to February 9, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Mahshahr Airport is January, with an average rainfall of 0.8 inches.

The rainless period of the year lasts for 9.0 months, from February 9 to November 10. The month with the least rain at Mahshahr Airport is September, with an average rainfall of 0.0 inches.

Average Monthly Rainfall at Mahshahr Airport

Average Monthly Rainfall at Mahshahr AirportrainrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inJan 60.9 inJan 60.9 inSep 90.0 inSep 90.0 inMar 120.5 inMar 120.5 inJul 20.2 inJul 20.2 inNov 100.5 inNov 100.5 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 0.8″0.5″0.5″0.3″0.1″0.2″0.1″0.1″0.0″0.2″0.6″0.8″

The length of the day at Mahshahr Airport varies significantly over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 10 minutes of daylight; the longest day is June 21, with 14 hours, 8 minutes of daylight.

Hours of Daylight and Twilight at Mahshahr Airport

Hours of Daylight and Twilight at Mahshahr AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 7 minJun 2114 hr, 7 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 10 minDec 2110 hr, 10 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 10.4h11.1h12.0h12.9h13.7h14.1h13.9h13.2h12.3h11.4h10.6h10.2h

The earliest sunrise is at 5:10 AM on June 10, and the latest sunrise is 2 hours, 1 minute later at 7:11 AM on January 10. The earliest sunset is at 5:11 PM on December 2, and the latest sunset is 2 hours, 8 minutes later at 7:19 PM on June 29.

Daylight saving time (DST) is not observed at Mahshahr Airport during 2024.

Sunrise & Sunset with Twilight at Mahshahr Airport

Sunrise & Sunset with Twilight at Mahshahr AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 105:10 AMJun 105:10 AM7:19 PMJun 297:19 PMJun 29Dec 25:11 PMDec 25:11 PM7:11 AMJan 107:11 AMJan 10daynightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 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 Mahshahr Airport

Solar Elevation and Azimuth at Mahshahr 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 AM000010101010202020203030303040404050505060607080000010101010202020203030303040404040505050606070708036NowNow
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 Mahshahr 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.

Mahshahr Airport experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.2 months, from April 16 to November 22, during which time the comfort level is muggy, oppressive, or miserable at least 5% of the time. The month with the most muggy days at Mahshahr Airport is August, with 5.3 days that are muggy or worse.

The month with the fewest muggy days at Mahshahr Airport is February, with 0.1 days that are muggy or worse.

Humidity Comfort Levels at Mahshahr Airport

Humidity Comfort Levels at Mahshahr AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 240%Jan 240%Aug 1918%Aug 1918%Apr 165%Apr 165%Nov 225%Nov 225%drydrycomfortablecomfortablehumidhumidmiserablemiserablemuggymuggy
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 0.1d0.1d0.5d1.4d1.5d0.9d3.0d5.3d4.3d4.8d2.1d0.5d

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

The windier part of the year lasts for 2.8 months, from May 13 to August 6, with average wind speeds of more than 8.7 miles per hour. The windiest month of the year at Mahshahr Airport is June, with an average hourly wind speed of 10.1 miles per hour.

The calmer time of year lasts for 9.2 months, from August 6 to May 13. The calmest month of the year at Mahshahr Airport is October, with an average hourly wind speed of 7.3 miles per hour.

Average Wind Speed at Mahshahr Airport

Average Wind Speed at Mahshahr AirportwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphJun 1710.3 mphJun 1710.3 mphOct 127.2 mphOct 127.2 mphAug 68.7 mphAug 68.7 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) 7.98.38.38.29.010.19.48.57.97.37.77.7

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

The wind is most often from the west for 3.7 months, from June 4 to September 24, with a peak percentage of 61% on July 4. The wind is most often from the north for 8.3 months, from September 24 to June 4, with a peak percentage of 42% on January 1.

Wind Direction at Mahshahr Airport

Wind Direction at Mahshahr AirportNWNJanFebMarAprMayJunJulAugSepOctNovDec0%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).

Mahshahr 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.4 months, from June 24 to October 6, with an average temperature above 81°F. The month of the year at Mahshahr Airport with the warmest water is August, with an average temperature of 87°F.

The time of year with cooler water lasts for 3.4 months, from December 20 to March 31, with an average temperature below 65°F. The month of the year at Mahshahr Airport with the coolest water is February, with an average temperature of 59°F.

Average Water Temperature at Mahshahr Airport

Average Water Temperature at Mahshahr AirportwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FAug 1487°FAug 1487°F59°FFeb 859°FFeb 8Jun 2481°FJun 2481°FOct 681°FOct 681°FDec 2065°FDec 2065°FMar 3165°FMar 3165°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 61°F59°F62°F68°F75°F80°F85°F87°F85°F79°F73°F66°F

To characterize how pleasant the weather is at Mahshahr Airport throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Mahshahr Airport for general outdoor tourist activities are from late February to mid April and from late October to late November, with a peak score in the third week of March.

Tourism Score at Mahshahr Airport

Tourism Score at Mahshahr Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.77.73.23.27.47.45.15.1NowNowtemperaturetemperature 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 times of year to visit Mahshahr Airport for hot-weather activities are from early April to early May and from late September to late October, with a peak score in the second week of October.

Beach/Pool Score at Mahshahr Airport

Beach/Pool Score at Mahshahr AirportJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.97.90.60.67.67.64.54.5NowNowtemperaturetemperature 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).

Temperatures at Mahshahr Airport are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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

Time Spent in Various Temperature Bands and the Growing Season at Mahshahr AirportJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Feb 7100%Feb 795%Jan 1295%Jan 12Jul 13100%Jul 13100%NowNowcoldcoolwarmhotswelteringvery coldcomfortable
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.

Growing Degree Days at Mahshahr Airport

Growing Degree Days at Mahshahr AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°F7,000°F7,000°F8,000°F8,000°F9,000°F9,000°FJan 1590°FJan 1590°FMar 25900°FMar 25900°FDec 318,820°FDec 318,820°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 3.3 months, from May 13 to August 24, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest month of the year at Mahshahr Airport is June, with an average of 8.2 kWh.

The darker period of the year lasts for 3.2 months, from November 3 to February 8, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest month of the year at Mahshahr Airport is December, with an average of 3.2 kWh.

Average Daily Incident Shortwave Solar Energy at Mahshahr Airport

Average Daily Incident Shortwave Solar Energy at Mahshahr AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 178.3 kWhJun 178.3 kWhDec 243.2 kWhDec 243.2 kWhAug 247.3 kWhAug 247.3 kWhNov 34.2 kWhNov 34.2 kWhFeb 84.2 kWhFeb 84.2 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) 3.54.55.56.57.48.27.97.46.65.13.83.2

For the purposes of this report, the geographical coordinates of Mahshahr Airport are 30.556 deg latitude, 49.152 deg longitude, and 16 ft elevation.

The topography within 2 miles of Mahshahr Airport contains only modest variations in elevation, with a maximum elevation change of 112 feet and an average elevation above sea level of 15 feet. Within 10 miles also contains only modest variations in elevation (430 feet). Within 50 miles contains only modest variations in elevation (2,290 feet).

The area within 2 miles of Mahshahr Airport is covered by shrubs (42%), bare soil (39%), and water (12%), within 10 miles by shrubs (50%) and bare soil (36%), and within 50 miles by shrubs (48%) and bare soil (22%).

This report illustrates the typical weather at Mahshahr 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

Mahshahr 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 are Aghajari Airport, Ahwaz International Airport, Abadan International Airport, Basra International Airport, and Gachsaran 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.