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Climate and Average Weather Year Round in Golpāyegān Iran

In Golpāyegān, the summers are hot, arid, and clear and the winters are very cold, snowy, and mostly clear. Over the course of the year, the temperature typically varies from 23°F to 94°F and is rarely below 15°F or above 100°F.

Based on the beach/pool score, the best time of year to visit Golpāyegān for hot-weather activities is from mid June to early September.

Climate in Golpāyegān

very coldcoldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow100%100%64%64%clearprecipitation: 1.0 inprecipitation: 1.0 in0.1 in0.1 inmuggy: 0%muggy: 0%0%0%drydrybeach/pool score: 9.1beach/pool score: 9.10.00.0
Golpāyegān weather by month. Click on each chart for more information.

The hot season lasts for 3.6 months, from June 1 to September 18, with an average daily high temperature above 84°F. The hottest month of the year in Golpāyegān is July, with an average high of 94°F and low of 66°F.

The cold season lasts for 3.4 months, from November 24 to March 6, with an average daily high temperature below 53°F. The coldest month of the year in Golpāyegān is January, with an average low of 24°F and high of 43°F.

Average High and Low Temperature in Golpāyegān

Average High and Low Temperature in GolpāyegānhotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2242°FJan 2242°FJul 1694°FJul 1694°F23°F23°F66°F66°FJun 184°FJun 184°FSep 1884°FSep 1884°FNov 2453°FNov 2453°FMar 653°FMar 653°F56°F56°F53°F53°F32°F32°F31°F31°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 43°F47°F56°F66°F77°F89°F94°F93°F85°F71°F57°F47°F
Temp. 33°F37°F45°F55°F65°F76°F81°F79°F70°F58°F45°F36°F
Low 24°F27°F34°F43°F52°F60°F66°F63°F54°F44°F34°F27°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 Golpāyegān

Average Hourly Temperature in GolpāyegānJanFebMarAprMayJunJulAugSepOctNovDec12 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 coldcoldcoldcoolcoolcomfortablewarmhotwarmfreezing
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.

Dodge City, Kansas, United States (7,168 miles away) is the far-away foreign place with temperatures most similar to Golpāyegān (view comparison).

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In Golpāyegān, 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 Golpāyegān begins around May 24 and lasts for 4.6 months, ending around October 13.

The clearest month of the year in Golpāyegān is July, during which on average the sky is clear, mostly clear, or partly cloudy 99% of the time.

The cloudier part of the year begins around October 13 and lasts for 7.4 months, ending around May 24.

The cloudiest month of the year in Golpāyegān is April, during which on average the sky is overcast or mostly cloudy 34% of the time.

Cloud Cover Categories in Golpāyegān

Cloud Cover Categories in GolpāyegānclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 29100%Aug 29100%Apr 2564%Apr 2564%May 2481%May 2481%Oct 1383%Oct 1383%NowNowclearmostly clearovercastpartly 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%28%31%34%24%4%1%1%2%20%31%32%
Clearer 71%72%69%66%76%96%99%99%98%80%69%68%

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

The wetter season lasts 6.6 months, from October 22 to May 11, with a greater than 8% chance of a given day being a wet day. The month with the most wet days in Golpāyegān is March, with an average of 4.1 days with at least 0.04 inches of precipitation.

The drier season lasts 5.4 months, from May 11 to October 22. The month with the fewest wet days in Golpāyegān is June, with an average of 0.4 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 Golpāyegān is March, with an average of 3.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 14% on March 20.

Daily Chance of Precipitation in Golpāyegān

Daily Chance of Precipitation in GolpāyegānwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 2015%Mar 2015%Jun 161%Jun 161%Oct 228%Oct 228%May 118%May 118%NowNowrainsnow
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 1.7d2.2d3.9d3.7d2.0d0.4d0.6d0.5d0.7d2.0d3.3d2.8d
Mixed 0.8d0.6d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.2d0.5d
Snow 0.6d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.3d
Any 3.1d3.0d4.1d3.7d2.0d0.4d0.6d0.5d0.7d2.0d3.5d3.6d

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. Golpāyegān experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.5 months, from October 25 to May 8, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Golpāyegān is March, with an average rainfall of 0.9 inches.

The rainless period of the year lasts for 5.5 months, from May 8 to October 25. The month with the least rain in Golpāyegān is August, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Golpāyegān

Average Monthly Rainfall in GolpāyegānrainrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inMar 281.0 inMar 281.0 inJul 300.1 inJul 300.1 inNov 230.8 inNov 230.8 inJan 210.5 inJan 210.5 inJun 250.2 inJun 250.2 inMay 80.5 inMay 80.5 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 0.5″0.6″0.9″0.9″0.3″0.1″0.1″0.1″0.1″0.4″0.8″0.7″

Snowfall

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

The snowy period of the year lasts for 1.6 months, from December 25 to February 12, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Golpāyegān is January, with an average snowfall of 1.7 inches.

The snowless period of the year lasts for 10 months, from February 12 to December 25. The least snow falls around July 12, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Golpāyegān

Average Monthly Snowfall in GolpāyegānsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inJan 181.7 inJan 181.7 inJul 120.0 inJul 120.0 inDec 251.0 inDec 251.0 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 1.7″0.9″0.2″0.0″0.0″0.0″0.0″0.0″0.0″0.0″0.2″0.7″

The length of the day in Golpāyegān varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 56 minutes of daylight; the longest day is June 21, with 14 hours, 22 minutes of daylight.

Hours of Daylight and Twilight in Golpāyegān

Hours of Daylight and Twilight in GolpāyegānJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 22 minJun 2114 hr, 22 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 229 hr, 56 minDec 219 hr, 56 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 10.2h11.0h12.0h13.0h13.9h14.3h14.1h13.3h12.4h11.3h10.4h10.0h

The earliest sunrise is at 4:58 AM on June 11, and the latest sunrise is 2 hours, 15 minutes later at 7:13 AM on January 8. The earliest sunset is at 5:00 PM on December 4, and the latest sunset is 2 hours, 22 minutes later at 7:22 PM on June 29.

Daylight saving time (DST) is not observed in Golpāyegān during 2024.

Sunrise & Sunset with Twilight in Golpāyegān

Sunrise & Sunset with Twilight in GolpāyegānJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 114:58 AMJun 114:58 AM7:22 PMJun 297:22 PMJun 29Dec 45:00 PMDec 45:00 PM7:13 AMJan 87:13 AMJan 8daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 in Golpāyegān

Solar Elevation and Azimuth in GolpāyegānJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0000101010102020202030303030404040505050606070000010101010202020203030303040404050506070703380NowNow
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 Golpāyegān

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 in Golpāyegān, 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 in Golpāyegān

Humidity Comfort Levels in GolpāyegānJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 80%Jan 80%Jul 90%Jul 90%NowNowdrydry
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 in Golpāyegān experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.0 months, from January 15 to May 15, with average wind speeds of more than 8.3 miles per hour. The windiest month of the year in Golpāyegān is March, with an average hourly wind speed of 9.6 miles per hour.

The calmer time of year lasts for 8.0 months, from May 15 to January 15. The calmest month of the year in Golpāyegān is September, with an average hourly wind speed of 6.9 miles per hour.

Average Wind Speed in Golpāyegān

Average Wind Speed in GolpāyegānwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mphMar 139.7 mphMar 139.7 mphSep 96.8 mphSep 96.8 mphJan 158.3 mphJan 158.3 mphMay 158.3 mphMay 158.3 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) 8.39.29.69.18.27.68.07.56.97.17.57.9

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

The wind is most often from the east for 2.7 months, from June 16 to September 7, with a peak percentage of 55% on July 31. The wind is most often from the south for 4.0 days, from September 7 to September 11, with a peak percentage of 32% on September 7. The wind is most often from the west for 9.2 months, from September 11 to June 16, with a peak percentage of 47% on January 1.

Wind Direction in Golpāyegān

Wind Direction in GolpāyegānWEWJanFebMarAprMayJunJulAugSepOctNovDec0%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 Golpāyegān 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 Golpāyegān for general outdoor tourist activities are from mid May to late June and from late August to early October, with a peak score in the third week of September.

Tourism Score in Golpāyegān

Tourism Score in Golpāyegānbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.88.80.10.18.58.56.96.9NowNowtemperaturetemperature 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 Golpāyegān for hot-weather activities is from mid June to early September, with a peak score in the second week of July.

Beach/Pool Score in Golpāyegān

Beach/Pool Score in Golpāyegānbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810109.19.10.00.0NowNowtemperaturetemperature 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 Golpāyegān typically lasts for 7.3 months (225 days), from around March 28 to around November 8, rarely starting before March 11 or after April 13, and rarely ending before October 18 or after November 26.

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

Time Spent in Various Temperature Bands and the Growing Season in Golpāyegāngrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2850%Mar 2850%Nov 850%Nov 890%Apr 1390%Apr 1390%Oct 1890%Oct 1810%Mar 1110%Mar 1110%Nov 2610%Nov 260%Jan 250%Jan 25Jul 13100%Jul 13100%freezingvery coldcoldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Golpāyegān should appear around April 2, only rarely appearing before March 20 or after April 15.

Growing Degree Days in Golpāyegān

Growing Degree Days in GolpāyegānJanFebMarAprMayJunJulAugSepOctNovDec0°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°FApr 285°FApr 285°FJun 6900°FJun 6900°FJul 101,800°FJul 101,800°FDec 314,208°FDec 314,208°F
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 23, with an average daily incident shortwave energy per square meter above 7.7 kWh. The brightest month of the year in Golpāyegān is June, with an average of 8.8 kWh.

The darker period of the year lasts for 3.3 months, from November 1 to February 10, with an average daily incident shortwave energy per square meter below 4.4 kWh. The darkest month of the year in Golpāyegān is December, with an average of 3.3 kWh.

Average Daily Incident Shortwave Solar Energy in Golpāyegān

Average Daily Incident Shortwave Solar Energy in GolpāyegānbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 178.9 kWhJun 178.9 kWhDec 153.3 kWhDec 153.3 kWhAug 237.7 kWhAug 237.7 kWhNov 14.4 kWhNov 14.4 kWhFeb 104.4 kWhFeb 104.4 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) 3.64.65.86.97.98.88.57.96.95.33.93.3

For the purposes of this report, the geographical coordinates of Golpāyegān are 33.454 deg latitude, 50.288 deg longitude, and 5,961 ft elevation.

The topography within 2 miles of Golpāyegān contains only modest variations in elevation, with a maximum elevation change of 148 feet and an average elevation above sea level of 5,960 feet. Within 10 miles contains only modest variations in elevation (4,491 feet). Within 50 miles also contains extreme variations in elevation (8,720 feet).

The area within 2 miles of Golpāyegān is covered by cropland (91%), within 10 miles by shrubs (52%) and cropland (26%), and within 50 miles by shrubs (65%) and sparse vegetation (14%).

This report illustrates the typical weather in Golpāyegān, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Golpāyegān.

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