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Climate and Average Weather Year Round at Adak Airport Alaska, United States

At Adak Airport, the summers are short, cold, and windy; the winters are long, very cold, and extremely windy; and it is overcast year round. Over the course of the year, the temperature typically varies from 29°F to 56°F and is rarely below 20°F or above 61°F.

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

Climate at Adak Airport

very coldcoldcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow41%41%13%13%overcastclearprecipitation: 3.1 inprecipitation: 3.1 in1.4 in1.4 inmuggy: 0%muggy: 0%drydrytourism score: 0.8tourism score: 0.80.00.0
Adak Airport weather by month. Click on each chart for more information.

The warm season lasts for 2.4 months, from July 4 to September 18, with an average daily high temperature above 52°F. The hottest month of the year at Adak Airport is August, with an average high of 55°F and low of 47°F.

The cold season lasts for 4.2 months, from November 27 to April 4, with an average daily high temperature below 40°F. The coldest month of the year at Adak Airport is January, with an average low of 29°F and high of 36°F.

Average High and Low Temperature at Adak Airport

Average High and Low Temperature at Adak AirportwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2435°FJan 2435°FAug 1256°FAug 1256°F29°F29°F47°F47°FJul 452°FJul 452°FSep 1852°FSep 1852°FNov 2740°FNov 2740°FApr 440°FApr 440°F44°F44°F44°F44°F33°F33°F32°F32°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 36°F36°F38°F41°F44°F49°F53°F55°F52°F47°F41°F37°F
Temp. 32°F33°F34°F37°F40°F44°F48°F51°F48°F43°F38°F34°F
Low 29°F30°F31°F34°F37°F42°F46°F47°F45°F39°F34°F31°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 Adak Airport

Average Hourly Temperature at Adak 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 AMNowNowfreezingvery coldvery coldcoldfreezing
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.

Ólafsvík, Iceland (4,245 miles away) is the far-away foreign place with temperatures most similar to Adak Airport (view comparison).

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At Adak 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 Adak Airport begins around August 31 and lasts for 3.4 months, ending around December 13.

The clearest month of the year at Adak Airport is October, during which on average the sky is clear, mostly clear, or partly cloudy 40% of the time.

The cloudier part of the year begins around December 13 and lasts for 8.6 months, ending around August 31.

The cloudiest month of the year at Adak Airport is July, during which on average the sky is overcast or mostly cloudy 85% of the time.

Cloud Cover Categories at Adak Airport

Cloud Cover Categories at Adak AirportclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 1341%Oct 1341%Jul 513%Jul 513%Aug 3127%Aug 3127%Dec 1328%Dec 1328%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 77%76%73%66%69%82%85%78%67%60%65%72%
Clearer 23%24%27%34%31%18%15%22%33%40%35%28%

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

The wetter season lasts 8.6 months, from July 7 to March 26, with a greater than 30% chance of a given day being a wet day. The month with the most wet days at Adak Airport is November, with an average of 11.7 days with at least 0.04 inches of precipitation.

The drier season lasts 3.4 months, from March 26 to July 7. The month with the fewest wet days at Adak Airport is May, with an average of 6.3 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 Adak Airport is November, with an average of 10.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 38% on November 8.

Daily Chance of Precipitation at Adak Airport

Daily Chance of Precipitation at Adak AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 1140%Nov 1140%May 420%May 420%Jul 730%Jul 730%Mar 2630%Mar 2630%NowNowrainmixedsnow
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 6.9d6.2d7.5d7.1d6.2d7.6d9.9d10.7d9.9d10.9d10.9d9.0d
Mixed 1.6d1.7d1.7d0.5d0.1d0.0d0.0d0.0d0.0d0.1d0.7d1.4d
Snow 0.7d0.7d0.3d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.4d
Any 9.3d8.5d9.5d7.5d6.3d7.6d9.9d10.7d9.9d10.9d11.7d10.8d

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. Adak Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Adak Airport. The month with the most rain at Adak Airport is August, with an average rainfall of 3.1 inches.

The month with the least rain at Adak Airport is May, with an average rainfall of 1.4 inches.

Average Monthly Rainfall at Adak Airport

Average Monthly Rainfall at Adak AirportJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inAug 253.1 inAug 253.1 inMay 151.4 inMay 151.4 inNov 33.0 inNov 33.0 inMar 142.0 inMar 142.0 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 1.9″1.8″2.0″1.6″1.4″1.8″2.5″3.1″2.9″2.9″2.9″2.5″

Snowfall

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

The snowy period of the year lasts for 4.0 months, from November 27 to March 28, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Adak Airport is February, with an average snowfall of 2.5 inches.

The snowless period of the year lasts for 8.0 months, from March 28 to November 27. The least snow falls around August 1, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Adak Airport

Average Monthly Snowfall at Adak AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inFeb 102.6 inFeb 102.6 inAug 10.0 inAug 10.0 inNov 271.0 inNov 271.0 inMar 281.0 inMar 281.0 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 2.3″2.5″1.6″0.3″0.0″0.0″0.0″0.0″0.0″0.0″0.5″1.7″

The length of the day at Adak Airport varies extremely over the course of the year. In 2024, the shortest day is December 20, with 7 hours, 46 minutes of daylight; the longest day is June 20, with 16 hours, 43 minutes of daylight.

Hours of Daylight and Twilight at Adak Airport

Hours of Daylight and Twilight at Adak AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 10 minMar 1912 hr, 10 minMar 1916 hr, 43 minJun 2016 hr, 43 minJun 2012 hr, 13 minSep 2212 hr, 13 minSep 227 hr, 46 minDec 207 hr, 46 minDec 20nightnightdayNowNow
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 8.4h10.0h12.0h14.0h15.7h16.6h16.1h14.5h12.6h10.6h8.8h7.9h

The earliest sunrise is at 6:26 AM on June 16, and the latest sunrise is 3 hours, 28 minutes later at 9:54 AM on December 29. The earliest sunset is at 5:35 PM on December 12, and the latest sunset is 5 hours, 35 minutes later at 11:10 PM on June 23.

Daylight saving time (DST) is observed at Adak Airport during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time at Adak Airport

Sunrise & Sunset with Twilight and Daylight Saving Time at Adak AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 166:26 AMJun 166:26 AM11:10 PMJun 2311:10 PMJun 23Dec 125:35 PMDec 125:35 PM9:54 AMDec 299:54 AMDec 29Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth at Adak Airport

Solar Elevation and Azimuth at Adak 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 AM00010101010202030304040500001010102020203030404050601562NowNow
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 Adak 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.

The perceived humidity level at Adak Airport, 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 at Adak Airport

Humidity Comfort Levels at Adak AirportJanFebMarAprMayJunJulAugSepOctNovDec0%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 at Adak Airport experiences extreme seasonal variation over the course of the year.

The windier part of the year lasts for 7.7 months, from September 15 to May 6, with average wind speeds of more than 16.9 miles per hour. The windiest month of the year at Adak Airport is November, with an average hourly wind speed of 21.2 miles per hour.

The calmer time of year lasts for 4.3 months, from May 6 to September 15. The calmest month of the year at Adak Airport is July, with an average hourly wind speed of 12.3 miles per hour.

Average Wind Speed at Adak Airport

Average Wind Speed at Adak AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mph35 mph35 mphNov 1921.7 mphNov 1921.7 mphJul 2012.0 mphJul 2012.0 mphSep 1516.9 mphSep 1516.9 mphMay 616.9 mphMay 616.9 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) 20.420.720.218.915.813.412.313.416.819.021.220.9

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

The wind is most often from the north for 1.2 months, from January 7 to February 13, with a peak percentage of 30% on January 21. The wind is most often from the east for 1.0 weeks, from February 13 to February 20 and for 1.1 weeks, from December 30 to January 7, with a peak percentage of 27% on February 19. The wind is most often from the west for 10 months, from February 20 to December 30, with a peak percentage of 45% on October 26.

Wind Direction at Adak Airport

Wind Direction at Adak AirportNWJanFebMarAprMayJunJulAugSepOctNovDec0%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).

Adak 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 some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.1 months, from July 22 to September 27, with an average temperature above 47°F. The month of the year at Adak Airport with the warmest water is August, with an average temperature of 48°F.

The time of year with cooler water lasts for 5.2 months, from December 12 to May 18, with an average temperature below 41°F. The month of the year at Adak Airport with the coolest water is February, with an average temperature of 39°F.

Average Water Temperature at Adak Airport

Average Water Temperature at Adak AirportwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec36°F36°F38°F38°F40°F40°F42°F42°F44°F44°F46°F46°F48°F48°F50°F50°F52°F52°FAug 2549°FAug 2549°F39°FFeb 2139°FFeb 21Jul 2247°FJul 2247°FSep 2747°FSep 2747°FDec 1241°FDec 1241°FMay 1841°FMay 1841°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 39°F39°F39°F39°F40°F43°F46°F48°F48°F45°F42°F40°F

To characterize how pleasant the weather is at Adak 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 time of year to visit Adak Airport for general outdoor tourist activities is for the entire month of August, with a peak score in the second week of August.

Tourism Score at Adak Airport

Tourism Score at Adak AirportJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.80.80.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitation
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 Adak Airport for hot-weather activities is from mid to late August.

Beach/Pool Score at Adak Airport

Beach/Pool Score at Adak AirportJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.00.00.00.0cloudscloudsprecipitationprecipitation
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 at Adak Airport typically lasts for 5.7 months (175 days), from around May 1 to around October 23, rarely starting before April 9 or after May 23, and rarely ending before September 27 or after November 20.

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

Time Spent in Various Temperature Bands and the Growing Season at Adak Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 150%May 150%Oct 2350%Oct 2350%May 2390%May 2390%Sep 2790%Sep 2790%Apr 910%Apr 910%Nov 2010%Nov 2010%0%Feb 60%Feb 6Jul 27100%Jul 27100%NowNowfreezingvery coldcoldcool
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 Adak Airport

Growing Degree Days at Adak AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F20°F20°F40°F40°F60°F60°F80°F80°F100°F100°F120°F120°F140°F140°F160°F160°FSep 490°FSep 490°FDec 31109°FDec 31109°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.8 months, from April 21 to August 15, with an average daily incident shortwave energy per square meter above 3.8 kWh. The brightest month of the year at Adak Airport is May, with an average of 4.5 kWh.

The darker period of the year lasts for 3.6 months, from October 28 to February 18, with an average daily incident shortwave energy per square meter below 1.3 kWh. The darkest month of the year at Adak Airport is December, with an average of 0.5 kWh.

Average Daily Incident Shortwave Solar Energy at Adak Airport

Average Daily Incident Shortwave Solar Energy at Adak AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhMay 284.7 kWhMay 284.7 kWhDec 210.5 kWhDec 210.5 kWhApr 213.8 kWhApr 213.8 kWhAug 153.8 kWhAug 153.8 kWhOct 281.3 kWhOct 281.3 kWhFeb 181.3 kWhFeb 181.3 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) 0.71.32.33.64.54.44.13.82.91.80.90.5

For the purposes of this report, the geographical coordinates of Adak Airport are 51.878 deg latitude, -176.646 deg longitude, and 10 ft elevation.

The topography within 2 miles of Adak Airport contains significant variations in elevation, with a maximum elevation change of 663 feet and an average elevation above sea level of 124 feet. Within 10 miles contains significant variations in elevation (3,819 feet). Within 50 miles also contains extreme variations in elevation (5,889 feet).

The area within 2 miles of Adak Airport is covered by water (48%), shrubs (39%), and grassland (10%), within 10 miles by water (56%) and shrubs (28%), and within 50 miles by water (94%).

This report illustrates the typical weather at Adak 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

Adak 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.

In this case, the only station close and reliable enough to use as a fallback is Atka 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.