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Climate and Average Weather Year Round in Qasigiannguit Greenland

In Qasigiannguit, the summers are cold and mostly cloudy and the winters are frigid, snowy, windy, and overcast. Over the course of the year, the temperature typically varies from -3°F to 52°F and is rarely below -23°F or above 59°F.

Based on the tourism score, the best time of year to visit Qasigiannguit for warm-weather activities is for the entire month of July.

Climate in Qasigiannguit

frigidfreezingvery coldcoldvery coldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow50%50%23%23%overcastclearprecipitation: 1.7 inprecipitation: 1.7 in0.2 in0.2 inmuggy: 0%muggy: 0%drydrytourism score: 1.3tourism score: 1.30.00.0
Qasigiannguit weather by month. Click on each chart for more information.

The warm season lasts for 3.1 months, from June 3 to September 5, with an average daily high temperature above 43°F. The hottest month of the year in Qasigiannguit is July, with an average high of 52°F and low of 42°F.

The cold season lasts for 3.2 months, from December 26 to April 2, with an average daily high temperature below 17°F. The coldest month of the year in Qasigiannguit is February, with an average low of -2°F and high of 9°F.

Average High and Low Temperature in Qasigiannguit

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 13°F9°F11°F23°F37°F47°F52°F49°F40°F30°F23°F18°F
Temp. 8°F3°F5°F17°F32°F42°F47°F45°F37°F26°F19°F13°F
Low 2°F-2°F-0°F12°F27°F38°F42°F40°F33°F23°F15°F9°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 Qasigiannguit

Average Hourly Temperature in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfrigidfrigidfreezingfreezingvery coldcoldcold
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.
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In Qasigiannguit, 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 Qasigiannguit begins around April 24 and lasts for 6.4 months, ending around November 6.

The clearest month of the year in Qasigiannguit is June, during which on average the sky is clear, mostly clear, or partly cloudy 48% of the time.

The cloudier part of the year begins around November 6 and lasts for 5.6 months, ending around April 24.

The cloudiest month of the year in Qasigiannguit is January, during which on average the sky is overcast or mostly cloudy 75% of the time.

Cloud Cover Categories in Qasigiannguit

Cloud Cover Categories in QasigiannguitclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 850%Jul 850%Jan 123%Jan 123%Apr 2437%Apr 2437%Nov 637%Nov 637%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 75%73%71%65%56%52%53%58%58%59%66%75%
Clearer 25%27%29%35%44%48%47%42%42%41%34%25%

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

The wetter season lasts 5.3 months, from June 11 to November 20, with a greater than 13% chance of a given day being a wet day. The month with the most wet days in Qasigiannguit is August, with an average of 6.3 days with at least 0.04 inches of precipitation.

The drier season lasts 6.7 months, from November 20 to June 11. The month with the fewest wet days in Qasigiannguit is January, with an average of 1.4 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. Based on this categorization, the most common form of precipitation in Qasigiannguit changes throughout the year.

Snow alone is the most common for 6.5 months, from October 17 to May 3. The month with the most days of snow alone in Qasigiannguit is November, with an average of 2.1 days.

Rain alone is the most common for 5.5 months, from May 3 to October 17. The month with the most days of rain alone in Qasigiannguit is August, with an average of 6.3 days.

Daily Chance of Precipitation in Qasigiannguit

Daily Chance of Precipitation in QasigiannguitsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Aug 922%Aug 922%Jan 44%Jan 44%May 311%May 311%Oct 1712%Oct 1712%Jun 1113%Jun 1113%Nov 2013%Nov 2013%NowNowsnowrain
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 0.1d0.1d0.2d0.7d2.1d3.8d5.4d6.3d4.1d1.7d0.9d0.3d
Mixed 0.3d0.4d0.4d0.7d0.7d0.1d0.0d0.0d0.3d0.9d1.0d0.3d
Snow 0.9d1.2d1.3d1.5d0.8d0.1d0.0d0.0d0.3d1.4d2.1d1.6d
Any 1.4d1.6d1.8d2.9d3.6d4.0d5.4d6.3d4.7d4.0d4.0d2.2d

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. Qasigiannguit experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.7 months, from May 8 to October 31, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Qasigiannguit is August, with an average rainfall of 1.7 inches.

The rainless period of the year lasts for 6.3 months, from October 31 to May 8. The month with the least rain in Qasigiannguit is January, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Qasigiannguit

Average Monthly Rainfall in QasigiannguitrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 inAug 151.7 inAug 151.7 inJan 80.1 inJan 80.1 inMay 80.5 inMay 80.5 inOct 310.5 inOct 310.5 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″0.1″0.1″0.3″0.5″0.8″1.1″1.7″1.0″0.5″0.4″0.1″

Snowfall

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

The snowy period of the year lasts for 8.1 months, from September 22 to May 25, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Qasigiannguit is November, with an average snowfall of 4.1 inches.

The snowless period of the year lasts for 3.9 months, from May 25 to September 22. The least snow falls around July 28, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Qasigiannguit

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″2.4″2.5″3.1″1.6″0.2″0.0″0.0″0.6″2.9″4.1″2.6″

Due to its extreme latitude, Qasigiannguit experiences polar day (also known as the midnight Sun) during the summer and polar night during the winter. These are periods of time in which the sun is continuously above or below the horizon for more than one day. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.

In the summer in Qasigiannguit during 2024, the Sun is continuously above the horizon for 2.0 months, rising at 2:38 AM on May 21, and not setting again until 2:02 AM on July 22.

In the winter in Qasigiannguit during 2024, the Sun is continuously below the horizon for 1.3 months, setting at 1:31 PM on December 1, and not rising again until 1:19 PM on January 10.

Hours of Daylight and Twilight in Qasigiannguit

Hours of Daylight and Twilight in Qasigiannguitpolar dayJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 14 minMar 2012 hr, 14 minMar 2024 hr, 0 minJun 2024 hr, 0 minJun 2012 hr, 25 minSep 2212 hr, 25 minSep 220 minDec 210 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 2.4h7.6h11.8h16.1h21.7h24.0h23.1h17.5h13.2h9.0h4.3h0.0h

Daylight saving time (DST) is observed in Qasigiannguit during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 26.

Sunrise & Sunset with Twilight and Daylight Saving Time in Qasigiannguit

Sunrise & Sunset with Twilight and Daylight Saving Time in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMMay 212:38 AMMay 212:38 AM2:02 AMJul 212:02 AMJul 211:31 PMDec 11:31 PMDec 1Jan 101:19 PMJan 101:19 PMMar 31DSTMar 31DSTDSTOct 26DSTOct 26daynightnightnightnightSolarMidnightSolarMidnightSolarNoonNowNow
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 Qasigiannguit

Solar Elevation and Azimuth in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0000101020203030400101020203040-245NowNow
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 Qasigiannguit

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 Qasigiannguit, 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 Qasigiannguit

Humidity Comfort Levels in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 20%Jul 20%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 Qasigiannguit experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.8 months, from September 21 to March 14, with average wind speeds of more than 8.8 miles per hour. The windiest month of the year in Qasigiannguit is December, with an average hourly wind speed of 11.8 miles per hour.

The calmer time of year lasts for 6.2 months, from March 14 to September 21. The calmest month of the year in Qasigiannguit is July, with an average hourly wind speed of 5.9 miles per hour.

Average Wind Speed in Qasigiannguit

Average Wind Speed in QasigiannguitwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mph22 mph22 mphNov 2812.0 mphNov 2812.0 mphJul 135.7 mphJul 135.7 mphSep 218.8 mphSep 218.8 mphMar 148.8 mphMar 148.8 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) 11.110.08.88.27.46.45.96.88.510.111.511.8

The predominant average hourly wind direction in Qasigiannguit is from the south throughout the year.

Wind Direction in Qasigiannguit

Wind Direction in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec0%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).

Qasigiannguit is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.7 months, from July 4 to September 27, with an average temperature above 38°F. The month of the year in Qasigiannguit with the warmest water is August, with an average temperature of 39°F.

The time of year with cooler water lasts for 5.0 months, from December 10 to May 9, with an average temperature below 32°F. The month of the year in Qasigiannguit with the coolest water is March, with an average temperature of 30°F.

Average Water Temperature in Qasigiannguit

Average Water Temperature in QasigiannguitwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec28°F28°F30°F30°F32°F32°F34°F34°F36°F36°F38°F38°F40°F40°F42°F42°F44°F44°FAug 2239°FAug 2239°F30°FMar 730°FMar 7Jul 438°FJul 438°FSep 2738°FSep 2738°FDec 1032°FDec 1032°FMay 932°FMay 932°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 30°F30°F30°F30°F32°F36°F38°F39°F38°F36°F33°F31°F

To characterize how pleasant the weather is in Qasigiannguit throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Qasigiannguit for general outdoor tourist activities is for the entire month of July, with a peak score in the third week of July.

Tourism Score in Qasigiannguit

Tourism Score in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec002244668810101.31.30.00.0NowNowtemperaturetemperature 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 Qasigiannguit for hot-weather activities is from early to mid July.

Beach/Pool Score in Qasigiannguit

Beach/Pool Score in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.00.00.00.0cloudscloudsprecipitationprecipitation
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 Qasigiannguit typically lasts for 3.0 months (93 days), from around June 7 to around September 9, rarely starting before May 19 or after July 1, and rarely ending before August 20 or after September 26.

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

Time Spent in Various Temperature Bands and the Growing Season in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 750%Jun 750%Sep 950%Sep 950%Jul 190%Jul 190%Aug 2090%Aug 2090%May 1910%May 1910%Sep 2610%Sep 2610%0%Mar 10%Mar 1Jul 3198%Jul 3198%NowNowfrigidfreezingvery coldcold
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 in Qasigiannguit

Growing Degree Days in QasigiannguitJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F20°F20°F40°F40°F60°F60°F80°F80°F100°F100°FDec 3161°FDec 3161°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 2.5 months, from May 10 to July 25, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest month of the year in Qasigiannguit is June, with an average of 6.3 kWh.

The darker period of the year lasts for 5.2 months, from October 2 to March 7, with an average daily incident shortwave energy per square meter below 1.3 kWh. The darkest month of the year in Qasigiannguit is December, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy in Qasigiannguit

Average Daily Incident Shortwave Solar Energy in QasigiannguitbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 246.4 kWhJun 246.4 kWhDec 160.0 kWhDec 160.0 kWhMay 105.1 kWhMay 105.1 kWhOct 21.3 kWhOct 21.3 kWhMar 71.3 kWhMar 71.3 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 0.00.51.83.75.46.35.63.82.10.70.10.0

For the purposes of this report, the geographical coordinates of Qasigiannguit are 68.819 deg latitude, -51.192 deg longitude, and 20 ft elevation.

The topography within 2 miles of Qasigiannguit contains very significant variations in elevation, with a maximum elevation change of 1,093 feet and an average elevation above sea level of 208 feet. Within 10 miles also contains very significant variations in elevation (1,706 feet). Within 50 miles contains very significant variations in elevation (3,563 feet).

The area within 2 miles of Qasigiannguit is covered by sparse vegetation (47%), trees (23%), and grassland (17%), within 10 miles by water (54%) and sparse vegetation (18%), and within 50 miles by water (37%) and snow and glaciers (31%).

This report illustrates the typical weather in Qasigiannguit, 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 is only a single weather station, Egedesminde, in our network suitable to be used as a proxy for the historical temperature and dew point records of Qasigiannguit.

At a distance of 68 kilometers from Qasigiannguit, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Qasigiannguit according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

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.