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Climate and Average Weather Year Round in Yerevan Armenia

In Yerevan, the summers are hot, dry, and clear and the winters are freezing, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from 19°F to 92°F and is rarely below 8°F or above 99°F.

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

Climate in Yerevan

very coldcoldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow98%98%52%52%clearovercastprecipitation: 1.1 inprecipitation: 1.1 in0.2 in0.2 inmuggy: 1%muggy: 1%0%0%drydrybeach/pool score: 8.8beach/pool score: 8.80.00.0
Yerevan weather by month. Click on each chart for more information.

The hot season lasts for 3.5 months, from June 1 to September 17, with an average daily high temperature above 81°F. The hottest month of the year in Yerevan is July, with an average high of 91°F and low of 67°F.

The cold season lasts for 3.0 months, from November 27 to February 28, with an average daily high temperature below 48°F. The coldest month of the year in Yerevan is January, with an average low of 19°F and high of 37°F.

Average High and Low Temperature in Yerevan

Average High and Low Temperature in YerevanhotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2337°FJan 2337°FJul 2792°FJul 2792°F19°F19°F68°F68°FJun 181°FJun 181°FSep 1781°FSep 1781°FNov 2748°FNov 2748°FFeb 2848°FFeb 2848°F56°F56°F55°F55°F29°F29°F27°F27°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 37°F42°F54°F66°F75°F85°F91°F91°F82°F68°F53°F41°F
Temp. 28°F32°F43°F55°F63°F73°F80°F79°F69°F56°F42°F31°F
Low 19°F23°F33°F43°F52°F60°F67°F65°F55°F44°F33°F24°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 Yerevan

Average Hourly Temperature in YerevanJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfreezingfreezingfreezingvery coldcoldcoldcoolcoolcomfortablewarmwarmhotvery coldfreezing
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.

Belleville, Kansas, United States (6,424 miles away) is the far-away foreign place with temperatures most similar to Yerevan (view comparison).

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Compare Yerevan to another city:

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In Yerevan, 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 Yerevan begins around May 30 and lasts for 4.2 months, ending around October 6.

The clearest month of the year in Yerevan is August, 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 6 and lasts for 7.8 months, ending around May 30.

The cloudiest month of the year in Yerevan is March, during which on average the sky is overcast or mostly cloudy 47% of the time.

Cloud Cover Categories in Yerevan

Cloud Cover Categories in YerevanclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 1698%Aug 1698%Apr 1152%Apr 1152%May 3075%May 3075%Oct 675%Oct 675%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 43%45%47%47%36%15%4%3%12%31%39%41%
Clearer 57%55%53%53%64%85%96%97%88%69%61%59%

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

The wetter season lasts 2.7 months, from April 5 to June 26, with a greater than 15% chance of a given day being a wet day. The month with the most wet days in Yerevan is May, with an average of 7.0 days with at least 0.04 inches of precipitation.

The drier season lasts 9.3 months, from June 26 to April 5. The month with the fewest wet days in Yerevan is January, with an average of 2.0 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. Based on this categorization, the most common form of precipitation in Yerevan changes throughout the year.

Rain alone is the most common for 12 months, from January 15 to December 31. The month with the most days of rain alone in Yerevan is May, with an average of 7.0 days.

Snow alone is the most common for 2.0 weeks, from January 1 to January 15. The month with the most days of snow alone in Yerevan is January, with an average of 0.9 days.

Daily Chance of Precipitation in Yerevan

Daily Chance of Precipitation in YerevanrainJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%May 524%May 524%Jan 46%Jan 46%Apr 515%Apr 515%Jun 2615%Jun 2615%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 0.8d1.2d3.0d5.6d7.0d5.2d3.4d2.2d2.5d3.9d2.7d1.4d
Mixed 0.4d0.4d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.2d0.3d
Snow 0.9d0.5d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.2d0.7d
Any 2.0d2.1d3.2d5.6d7.0d5.2d3.4d2.2d2.5d3.9d3.0d2.3d

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. Yerevan experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.7 months, from March 22 to November 12, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Yerevan is May, with an average rainfall of 1.1 inches.

The rainless period of the year lasts for 4.3 months, from November 12 to March 22. The month with the least rain in Yerevan is January, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Yerevan

Average Monthly Rainfall in YerevanrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inMay 111.1 inMay 111.1 inJan 190.1 inJan 190.1 inOct 260.7 inOct 260.7 inAug 210.3 inAug 210.3 inMar 220.5 inMar 220.5 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 0.1″0.2″0.4″0.8″1.1″0.8″0.5″0.3″0.4″0.6″0.4″0.2″

Snowfall

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

The snowy period of the year lasts for 2.1 months, from December 11 to February 13, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Yerevan is January, with an average snowfall of 1.4 inches.

The snowless period of the year lasts for 9.9 months, from February 13 to December 11. The least snow falls around July 16, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Yerevan

Average Monthly Snowfall in YerevansnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inJan 11.5 inJan 11.5 inJul 160.0 inJul 160.0 inDec 111.0 inDec 111.0 inFeb 131.0 inFeb 131.0 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 1.4″1.0″0.2″0.0″0.0″0.0″0.0″0.0″0.0″0.0″0.4″1.1″

The length of the day in Yerevan varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 19 minutes of daylight; the longest day is June 21, with 15 hours, 2 minutes of daylight.

Hours of Daylight and Twilight in Yerevan

Hours of Daylight and Twilight in YerevanJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 2 minJun 2115 hr, 2 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 19 minDec 219 hr, 19 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.7h10.7h12.0h13.3h14.4h15.0h14.7h13.7h12.4h11.1h10.0h9.4h

The earliest sunrise is at 5:31 AM on June 13, and the latest sunrise is 2 hours, 53 minutes later at 8:24 AM on January 5. The earliest sunset is at 5:35 PM on December 7, and the latest sunset is 3 hours, 0 minutes later at 8:35 PM on June 27.

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

Sunrise & Sunset with Twilight in Yerevan

Sunrise & Sunset with Twilight in YerevanJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:31 AMJun 135:31 AM8:35 PMJun 278:35 PMJun 27Dec 75:35 PMDec 75:35 PM8:24 AMJan 58:24 AMJan 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 Yerevan

Solar Elevation and Azimuth in YerevanJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM000010101010202020203030303040404050506060700000101010102020202030303040405050602673NowNow
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 Yerevan

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 Yerevan, 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, staying within 1% of 1% throughout.

Humidity Comfort Levels in Yerevan

Humidity Comfort Levels in YerevanJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 60%Mar 60%Jul 181%Jul 181%comfortablecomfortabledrydryhumidhumid
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 0.0d0.0d0.0d0.0d0.0d0.1d0.3d0.2d0.0d0.0d0.0d0.0d

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 Yerevan experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.4 months, from February 6 to September 18, with average wind speeds of more than 4.9 miles per hour. The windiest month of the year in Yerevan is March, with an average hourly wind speed of 5.8 miles per hour.

The calmer time of year lasts for 4.6 months, from September 18 to February 6. The calmest month of the year in Yerevan is December, with an average hourly wind speed of 4.0 miles per hour.

Average Wind Speed in Yerevan

Average Wind Speed in YerevanwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mph11 mph11 mphApr 75.9 mphApr 75.9 mphJan 13.9 mphJan 13.9 mphSep 184.9 mphSep 184.9 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) 4.25.15.85.75.35.35.65.44.94.44.24.0

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

The wind is most often from the east for 5.6 months, from May 24 to November 11, with a peak percentage of 56% on July 26. The wind is most often from the west for 1.1 months, from November 11 to December 15 and for 4.9 months, from December 26 to May 24, with a peak percentage of 32% on December 8. The wind is most often from the south for 1.6 weeks, from December 15 to December 26, with a peak percentage of 33% on December 21.

Wind Direction in Yerevan

Wind Direction in YerevanWEWSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwesteastnorthsouth
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 Yerevan 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 Yerevan for general outdoor tourist activities are from late May to late June and from late August to late September, with a peak score in the second week of September.

Tourism Score in Yerevan

Tourism Score in YerevanJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.28.20.00.07.87.86.66.6NowNow 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 Yerevan for hot-weather activities is from late June to early September, with a peak score in the second week of August.

Beach/Pool Score in Yerevan

Beach/Pool Score in Yerevanbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.88.80.00.0NowNowtemperaturetemperature 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 Yerevan typically lasts for 7.2 months (219 days), from around March 29 to around November 4, rarely starting before March 11 or after April 18, and rarely ending before October 17 or after November 21.

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

Time Spent in Various Temperature Bands and the Growing Season in Yerevangrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2950%Mar 2950%Nov 450%Nov 490%Apr 1890%Apr 1890%Oct 1790%Oct 1710%Mar 1110%Mar 1110%Nov 2110%Nov 210%Dec 210%Dec 21Jul 14100%Jul 14100%frigidfreezingvery 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 Yerevan should appear around April 6, only rarely appearing before March 25 or after April 17.

Growing Degree Days in Yerevan

Growing Degree Days in YerevanJanFebMarAprMayJunJulAugSepOctNovDec0°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 688°FApr 688°FJun 10900°FJun 10900°FJul 161,800°FJul 161,800°FDec 313,931°FDec 313,931°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 3.2 months, from May 19 to August 25, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest month of the year in Yerevan is July, with an average of 7.9 kWh.

The darker period of the year lasts for 3.5 months, from October 29 to February 13, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest month of the year in Yerevan is December, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy in Yerevan

Average Daily Incident Shortwave Solar Energy in YerevanbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJul 48.0 kWhJul 48.0 kWhDec 212.2 kWhDec 212.2 kWhMay 196.9 kWhMay 196.9 kWhAug 256.9 kWhAug 256.9 kWhOct 293.4 kWhOct 293.4 kWhFeb 133.4 kWhFeb 133.4 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) 2.63.54.65.76.87.87.97.15.84.12.82.3

For the purposes of this report, the geographical coordinates of Yerevan are 40.181 deg latitude, 44.514 deg longitude, and 3,261 ft elevation.

The topography within 2 miles of Yerevan contains very significant variations in elevation, with a maximum elevation change of 1,293 feet and an average elevation above sea level of 3,475 feet. Within 10 miles contains very significant variations in elevation (4,344 feet). Within 50 miles also contains extreme variations in elevation (14,206 feet).

The area within 2 miles of Yerevan is covered by trees (36%), grassland (27%), shrubs (19%), and sparse vegetation (11%), within 10 miles by cropland (31%) and trees (22%), and within 50 miles by cropland (23%) and trees (18%).

This report illustrates the typical weather in Yerevan, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Yerevan.

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