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Average Weather at Chevak Airport Alaska, United States

At Chevak Airport, the summers are cool; the winters are long, frigid, snowy, and windy; and it is overcast year round. Over the course of the year, the temperature typically varies from 3°F to 59°F and is rarely below -17°F or above 69°F.

Climate Summary

freezingcoldcoolcoldvery coldfreezingJanFebMarAprMayJunJulAugSepOctNovDec40%40%21%21%overcastclearprecipitation: 2.9 inprecipitation: 2.9 in0.7 in0.7 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 1.7tourism score: 1.70.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Chevak Airport for warm-weather activities is from early July to early August.

Temperature

The warm season lasts for 3.6 months, from May 30 to September 16, with an average daily high temperature above 51°F. The hottest day of the year is July 19, with an average high of 59°F and low of 49°F.

The cold season lasts for 4.2 months, from November 22 to March 28, with an average daily high temperature below 24°F. The coldest day of the year is January 20, with an average low of 3°F and high of 15°F.

Average High and Low Temperature

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.

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

Average Hourly Temperature at Chevak AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfrigidfrigidfreezingfreezingcoldcoolvery coldvery cold
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Kárášjohka, Norway (3,372 miles away) is the far-away foreign place with temperatures most similar to Chevak Airport (view comparison).

Clouds

At Chevak Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Chevak Airport begins around August 21 and lasts for 2.6 months, ending around November 10. On October 6, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 40% of the time, and overcast or mostly cloudy 60% of the time.

The cloudier part of the year begins around November 10 and lasts for 9.4 months, ending around August 21. On January 7, the cloudiest day of the year, the sky is overcast or mostly cloudy 79% of the time, and clear, mostly clear, or partly cloudy 21% of the time.

Cloud Cover Categories

Cloud Cover Categories at Chevak AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 640%Oct 640%Jan 721%Jan 721%Aug 2130%Aug 2130%Nov 1031%Nov 1031%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 5.5 months, from July 2 to December 19, with a greater than 24% chance of a given day being a wet day. The chance of a wet day peaks at 36% on August 15.

The drier season lasts 6.5 months, from December 19 to July 2. The smallest chance of a wet day is 13% on March 26.

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 at Chevak Airport changes throughout the year.

Rain alone is the most common for 6.5 months, from April 17 to November 2. The highest chance of a day with rain alone is 36% on August 15.

Snow alone is the most common for 5.2 months, from November 2 to April 9. The highest chance of a day with snow alone is 17% on January 2.

Mixed snow and rain is the most common for 1.1 weeks, from April 9 to April 17. The highest chance of a day with mixed snow and rain is 7% on November 21.

Daily Chance of Precipitation

Daily Chance of Precipitation at Chevak AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 1536%Aug 1536%Mar 2613%Mar 2613%Nov 223%Nov 223%Jan 124%Jan 124%Jul 224%Jul 224%snowrainmixed
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).

Rainfall

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. Chevak Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.0 months, from April 21 to November 22, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 22, with an average total accumulation of 2.9 inches.

The rainless period of the year lasts for 5.0 months, from November 22 to April 21. The least rain falls around March 13, with an average total accumulation of 0.2 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

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

The snowy period of the year lasts for 7.4 months, from September 30 to May 11, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 6, with an average total liquid-equivalent accumulation of 1.1 inches.

The snowless period of the year lasts for 4.6 months, from May 11 to September 30. The least snow falls around July 23, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Chevak AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 inDec 61.1 inDec 61.1 inJul 230.0 inJul 230.0 inSep 300.1 inSep 300.1 inMay 110.1 inMay 110.1 in
The average liquid-equivalent 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.

Sun

The length of the day at Chevak Airport varies extremely over the course of the year. In 2017, the shortest day is December 21, with 5 hours, 20 minutes of daylight; the longest day is June 20, with 19 hours, 31 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Chevak AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 11 minMar 2012 hr, 11 minMar 2019 hr, 31 minJun 2019 hr, 31 minJun 2012 hr, 13 minSep 2212 hr, 13 minSep 225 hr, 20 minDec 215 hr, 20 minDec 21nightnightday
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.

The earliest sunrise is at 5:18 AM on June 19, and the latest sunrise is 6 hours, 4 minutes later at 11:22 AM on December 25. The earliest sunset is at 4:39 PM on December 16, and the latest sunset is 8 hours, 11 minutes later at 12:50 AM on June 22.

Daylight saving time (DST) is observed at Chevak Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Chevak AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 195:18 AMJun 195:18 AM12:50 AMJun 2212:50 AMJun 22Dec 164:39 PMDec 164:39 PM11:22 AMDec 2511:22 AMDec 25Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

Humidity

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 Chevak 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

Humidity Comfort Levels at Chevak AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 80%Feb 80%Aug 100%Aug 100%drydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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

The windier part of the year lasts for 7.0 months, from September 23 to April 22, with average wind speeds of more than 13.0 miles per hour. The windiest day of the year is February 11, with an average hourly wind speed of 16.5 miles per hour.

The calmer time of year lasts for 5.0 months, from April 22 to September 23. The calmest day of the year is June 30, with an average hourly wind speed of 9.5 miles per hour.

Average Wind Speed

Average Wind Speed at Chevak AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mph24 mphFeb 1116.5 mphFeb 1116.5 mphJun 309.5 mphJun 309.5 mphSep 2313.0 mphSep 2313.0 mphApr 2213.0 mphApr 2213.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the north for 1.3 weeks, from January 11 to January 20; for 1.6 weeks, from February 5 to February 16; for 4.1 months, from February 22 to June 25; and for 3.6 months, from August 20 to December 8, with a peak percentage of 45% on April 20. The wind is most often from the east for 2.3 weeks, from January 20 to February 5; for 6.0 days, from February 16 to February 22; and for 1.1 months, from December 8 to January 11, with a peak percentage of 41% on January 27. The wind is most often from the south for 1.2 months, from June 25 to August 1 and for 3.0 days, from August 17 to August 20, with a peak percentage of 32% on July 29.

Wind Direction

Wind Direction at Chevak AirportEENNSWNEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

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

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

The time of year with warmer water lasts for 2.4 months, from July 9 to September 22, with an average temperature above 48°F. The day of the year with the warmest water is August 17, with an average temperature of 52°F.

The time of year with cooler water lasts for 6.3 months, from November 10 to May 20, with an average temperature below 35°F. The day of the year with the coolest water is December 29, with an average temperature of 31°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is at Chevak 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 Chevak Airport for general outdoor tourist activities is from early July to early August, with a peak score in the last week of July.

Tourism Score

Tourism Score at Chevak AirportJanFebMarAprMayJunJulAugSepOctNovDec02468101.71.70.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
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 Chevak Airport for hot-weather activities is for the entire month of July, with a peak score in the second week of July.

Beach/Pool Score

Beach/Pool Score at Chevak AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.10.10.00.0precipitationprecipitationcloudscloudstemperaturetemperature
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.

Growing Season

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 Chevak Airport typically lasts for 4.1 months (125 days), from around May 28 to around September 30, rarely starting before May 10 or after June 14, and rarely ending before September 15 or after October 16.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Chevak Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2850%May 2850%Sep 3050%Sep 3050%Jun 1490%Jun 1490%Sep 1590%Sep 1590%May 1010%May 1010%Oct 1610%Oct 1610%0%Dec 30%Dec 3Jul 31100%Jul 31100%frigidfreezingcoldcoolvery cold
The percentage of time spent in various temperature bands: 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 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 at Chevak Airport should appear around July 4, only rarely appearing before June 19 or after July 31.

Growing Degree Days

Growing Degree Days at Chevak AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F50°F100°F150°F200°F250°F300°F350°F400°FJul 490°FJul 490°FDec 31305°FDec 31305°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 3.0 months, from April 23 to July 22, with an average daily incident shortwave energy per square meter above 4.2 kWh. The brightest day of the year is June 5, with an average of 5.2 kWh.

The darker period of the year lasts for 4.2 months, from October 15 to February 21, with an average daily incident shortwave energy per square meter below 1.1 kWh. The darkest day of the year is December 21, with an average of 0.1 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Chevak Airport are 61.537 deg latitude, -165.603 deg longitude, and 26 ft elevation.

The topography within 2 miles of Chevak Airport is essentially flat, with a maximum elevation change of 75 feet and an average elevation above sea level of 25 feet. Within 10 miles is essentially flat (131 feet). Within 50 miles contains only modest variations in elevation (2,388 feet).

The area within 2 miles of Chevak Airport is covered by shrubs (47%), herbaceous vegetation (28%), and sparse vegetation (24%), within 10 miles by herbaceous vegetation (35%) and shrubs (34%), and within 50 miles by water (55%) and herbaceous vegetation (20%).

Data Sources

This report illustrates the typical weather at Chevak 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

Chevak Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Scammon Bay Airport, Cape Romanzof LRRS Airport, Hooper Bay Airport, Toksook Bay Airport, Mekoryuk Airport, Emmonak Airport, Mountain Village Airport, and St. Mary's 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 Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.