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Average Weather in Akutan Alaska, United States

In Akutan, the summers are short, cold, windy, and overcast and the winters are long, very cold, wet, extremely windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 31°F to 54°F and is rarely below 21°F or above 60°F.

Climate Summary

very coldcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDec44%44%20%20%overcastclearprecipitation: 3.9 inprecipitation: 3.9 in1.7 in1.7 inmuggy: 0%muggy: 0%drydrytourism score: 1.0tourism score: 1.00.00.0
Click on each chart for more information.

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

Temperature

The warm season lasts for 2.5 months, from July 3 to September 18, with an average daily high temperature above 51°F. The hottest day of the year is August 14, with an average high of 54°F and low of 48°F.

The cold season lasts for 4.8 months, from November 30 to April 23, with an average daily high temperature below 39°F. The coldest day of the year is January 23, with an average low of 31°F and high of 36°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 in AkutanJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldvery coldcold
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.

Ólafsvík, Iceland (3,975 miles away) is the far-away foreign place with temperatures most similar to Akutan (view comparison).

Clouds

In Akutan, 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 Akutan begins around September 1 and lasts for 2.9 months, ending around November 30. On October 14, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 44% of the time, and overcast or mostly cloudy 56% of the time.

The cloudier part of the year begins around November 30 and lasts for 9.1 months, ending around September 1. On July 10, the cloudiest day of the year, the sky is overcast or mostly cloudy 80% of the time, and clear, mostly clear, or partly cloudy 20% of the time.

Cloud Cover Categories

Cloud Cover Categories in AkutanclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 1444%Oct 1444%Jul 1020%Jul 1020%Sep 132%Sep 132%Nov 3033%Nov 3033%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 in Akutan varies throughout the year.

The wetter season lasts 5.7 months, from August 30 to February 19, with a greater than 36% chance of a given day being a wet day. The chance of a wet day peaks at 47% on December 17.

The drier season lasts 6.3 months, from February 19 to August 30. The smallest chance of a wet day is 24% on May 5.

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 throughout the year is rain alone, with a peak probability of 40% on November 6.

Daily Chance of Precipitation

Daily Chance of Precipitation in AkutanwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 1747%Dec 1747%May 524%May 524%Aug 3036%Aug 3036%Feb 1936%Feb 1936%rainsnow
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. Akutan experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Akutan. The most rain falls during the 31 days centered around December 8, with an average total accumulation of 3.7 inches.

The least rain falls around April 25, with an average total accumulation of 1.6 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. Akutan experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.5 months, from November 24 to April 10, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 28, with an average total liquid-equivalent accumulation of 0.6 inches.

The snowless period of the year lasts for 7.5 months, from April 10 to November 24. The least snow falls around August 6, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in AkutansnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 in4.0 inJan 280.6 inJan 280.6 inAug 60.0 inAug 60.0 inNov 240.1 inNov 240.1 inApr 100.1 inApr 100.1 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 in Akutan varies extremely over the course of the year. In 2017, the shortest day is December 21, with 7 hours, 21 minutes of daylight; the longest day is June 20, with 17 hours, 11 minutes of daylight.

Hours of Daylight and Twilight

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 6:29 AM on June 17, and the latest sunrise is 3 hours, 54 minutes later at 10:23 AM on December 29. The earliest sunset is at 5:39 PM on December 13, and the latest sunset is 6 hours, 1 minute later at 11:40 PM on June 24.

Daylight saving time (DST) is observed in Akutan 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 in AkutanJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 176:29 AMJun 176:29 AM11:40 PMJun 2411:40 PMJun 24Dec 135:39 PMDec 135:39 PM10:23 AMDec 2910:23 AMDec 29Mar 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 in Akutan, 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 in AkutanJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 30%Jul 30%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 in Akutan experiences extreme seasonal variation over the course of the year.

The windier part of the year lasts for 7.5 months, from September 15 to April 30, with average wind speeds of more than 16.2 miles per hour. The windiest day of the year is November 25, with an average hourly wind speed of 21.3 miles per hour.

The calmer time of year lasts for 4.5 months, from April 30 to September 15. The calmest day of the year is July 17, with an average hourly wind speed of 11.2 miles per hour.

Average Wind Speed

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 in Akutan varies throughout the year.

The wind is most often from the west for 6.0 months, from June 16 to December 16, with a peak percentage of 42% on August 29. The wind is most often from the north for 6.0 months, from December 16 to June 16, with a peak percentage of 29% on January 1.

Wind Direction

Wind Direction in AkutanNWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
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

Akutan 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 2.5 months, from July 15 to October 1, with an average temperature above 47°F. The day of the year with the warmest water is August 21, with an average temperature of 49°F.

The time of year with cooler water lasts for 4.4 months, from January 4 to May 16, with an average temperature below 40°F. The day of the year with the coolest water is March 29, with an average temperature of 38°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 in Akutan 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 Akutan for general outdoor tourist activities is for the entire month of August, with a peak score in the third week of August.

Tourism Score

Tourism Score in AkutanJanFebMarAprMayJunJulAugSepOctNovDec02468101.01.00.00.0 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 Akutan for hot-weather activities is from late July to mid August, with a peak score in the second week of August.

Beach/Pool Score

Beach/Pool Score in AkutanJanFebMarAprMayJunJulAugSepOctNovDec02468100.00.00.00.0precipitationprecipitationcloudsclouds
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 in Akutan typically lasts for 6.6 months (201 days), from around April 28 to around November 15, rarely starting before April 9 or after May 16, and rarely ending before October 24 or after December 12.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Akutangrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 2850%Apr 2850%Nov 1550%Nov 1590%May 1690%May 1690%Oct 2490%Oct 2410%Apr 910%Apr 910%Dec 1210%Dec 120%Feb 50%Feb 5Aug 2100%Aug 2100%freezingvery coldcoldcool
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.

Growing Degree Days

Growing Degree Days in AkutanJanFebMarAprMayJunJulAugSepOctNovDec0°F20°F40°F60°F80°F100°F120°F140°F160°FSep 1890°FSep 1890°FDec 3196°FDec 3196°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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.6 months, from April 24 to August 11, with an average daily incident shortwave energy per square meter above 3.9 kWh. The brightest day of the year is May 30, with an average of 4.8 kWh.

The darker period of the year lasts for 3.6 months, from October 28 to February 17, with an average daily incident shortwave energy per square meter below 1.3 kWh. The darkest day of the year is December 16, with an average of 0.4 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 Akutan are 54.136 deg latitude, -165.773 deg longitude, and 279 ft elevation.

The topography within 2 miles of Akutan contains very significant variations in elevation, with a maximum elevation change of 1,821 feet and an average elevation above sea level of 470 feet. Within 10 miles contains very significant variations in elevation (4,180 feet). Within 50 miles also contains extreme variations in elevation (5,833 feet).

The area within 2 miles of Akutan is covered by water (40%) and shrubs (34%), within 10 miles by water (62%) and shrubs (19%), and within 50 miles by water (90%).

Data Sources

This report illustrates the typical weather in Akutan, 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 Akutan.

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

The stations contributing to this reconstruction are: Unalaska Airport (84%, 57 kilometers, southwest) and False Pass Airport (16%, 172 kilometers, northeast).

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.