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Average Weather at Unalakleet Airport Alaska, United States

At Unalakleet Airport, the summers are cool and mostly cloudy and the winters are long, frigid, snowy, windy, and partly cloudy. Over the course of the year, the temperature typically varies from -1°F to 61°F and is rarely below -28°F or above 71°F.

Climate Summary

frigidfreezingcoldcoolcoldfreezingfrigidJanFebMarAprMayJunJulAugSepOctNovDec44%44%29%29%overcastclearprecipitation: 3.6 inprecipitation: 3.6 in0.6 in0.6 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 2.8tourism score: 2.80.00.0
Click on each chart for more information.

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

Temperature

The warm season lasts for 3.5 months, from May 30 to September 14, with an average daily high temperature above 51°F. The hottest day of the year is July 14, with an average high of 61°F and low of 51°F.

The cold season lasts for 4.2 months, from November 13 to March 21, with an average daily high temperature below 21°F. The coldest day of the year is January 19, with an average low of -1°F and high of 11°F.

Average High and Low Temperature

Average High and Low Temperature at Unalakleet AirportwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-30°F-20°F-10°F0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F100°F110°FJan 1911°FJan 1911°FJul 1461°FJul 1461°F-1°F-1°F51°F51°FMay 3051°FMay 3051°FSep 1451°FSep 1451°FNov 1321°FNov 1321°FMar 2121°FMar 2121°F38°F38°F40°F40°F11°F11°F6°F6°FLowHigh
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 Unalakleet AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfrigidfrigidfreezingfreezingcoldcoolvery coldvery coldcool
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.

Enontekiö, Finland (3,299 miles away) is the far-away foreign place with temperatures most similar to Unalakleet Airport (view comparison).

Clouds

At Unalakleet 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 Unalakleet Airport begins around February 18 and lasts for 4.1 months, ending around June 21. On March 19, 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 June 21 and lasts for 7.9 months, ending around February 18. On December 14, the cloudiest day of the year, the sky is overcast or mostly cloudy 70% of the time, and clear, mostly clear, or partly cloudy 29% of the time.

Cloud Cover Categories

Cloud Cover Categories at Unalakleet AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Mar 1944%Mar 1944%Dec 1429%Dec 1429%Jun 2137%Jun 2137%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 Unalakleet Airport varies significantly throughout the year.

The wetter season lasts 3.3 months, from July 1 to October 10, with a greater than 24% chance of a given day being a wet day. The chance of a wet day peaks at 39% on August 10.

The drier season lasts 8.7 months, from October 10 to July 1. The smallest chance of a wet day is 9% on March 22.

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 Unalakleet Airport changes throughout the year.

Rain alone is the most common for 6.7 months, from April 11 to October 31. The highest chance of a day with rain alone is 39% on August 10.

Snow alone is the most common for 5.3 months, from October 31 to April 11. The highest chance of a day with snow alone is 15% on January 1.

Daily Chance of Precipitation

Daily Chance of Precipitation at Unalakleet AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 1039%Aug 1039%Mar 229%Mar 229%Oct 3120%Oct 3120%Jan 118%Jan 118%Jul 124%Jul 124%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. Unalakleet Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.6 months, from April 20 to November 8, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 13, with an average total accumulation of 3.6 inches.

The rainless period of the year lasts for 5.4 months, from November 8 to April 20. The least rain falls around December 16, 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. Unalakleet Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.4 months, from September 30 to May 12, 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 29, with an average total liquid-equivalent accumulation of 0.8 inches.

The snowless period of the year lasts for 4.6 months, from May 12 to September 30. The least snow falls around July 26, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Unalakleet AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 in4.0 inDec 290.8 inDec 290.8 inJul 260.0 inJul 260.0 inJan 290.7 inJan 290.7 inSep 300.1 inSep 300.1 inMay 120.1 inMay 120.1 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 Unalakleet Airport varies extremely over the course of the year. In 2017, the shortest day is December 21, with 4 hours, 16 minutes of daylight; the longest day is June 20, with 20 hours, 56 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Unalakleet AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 12 minMar 2012 hr, 12 minMar 2020 hr, 56 minJun 2020 hr, 56 minJun 2012 hr, 14 minSep 2212 hr, 14 minSep 224 hr, 16 minDec 214 hr, 16 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 4:16 AM on June 19, and the latest sunrise is 7 hours, 18 minutes later at 11:34 AM on December 24. The earliest sunset is at 3:48 PM on December 17, and the latest sunset is 9 hours, 25 minutes later at 1:13 AM on June 21.

Daylight saving time (DST) is observed at Unalakleet 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 Unalakleet AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 194:16 AMJun 194:16 AM1:13 AMJun 211:13 AMJun 21Dec 173:48 PMDec 173:48 PM11:34 AMDec 2411:34 AMDec 24Mar 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 Unalakleet 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 Unalakleet AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 250%Dec 250%Jun 250%Jun 250%drydrycomfortablecomfortable
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 Unalakleet Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from October 2 to April 8, with average wind speeds of more than 11.3 miles per hour. The windiest day of the year is January 9, with an average hourly wind speed of 14.9 miles per hour.

The calmer time of year lasts for 5.8 months, from April 8 to October 2. The calmest day of the year is June 20, with an average hourly wind speed of 7.7 miles per hour.

Average Wind Speed

Average Wind Speed at Unalakleet AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mph24 mphJan 914.9 mphJan 914.9 mphJun 207.7 mphJun 207.7 mphOct 211.3 mphOct 211.3 mphApr 811.3 mphApr 811.3 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 Unalakleet Airport varies throughout the year.

The wind is most often from the west for 1.9 months, from May 30 to July 26, with a peak percentage of 39% on June 26. The wind is most often from the south for 1.1 months, from July 26 to August 30, with a peak percentage of 35% on July 29. The wind is most often from the east for 8.7 months, from August 30 to May 21, with a peak percentage of 61% on January 1.

Wind Direction

Wind Direction at Unalakleet AirportEWSEJanFebMarAprMayJunJulAugSepOctNovDec0%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

Unalakleet 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 2.2 months, from July 6 to September 12, with an average temperature above 49°F. The day of the year with the warmest water is August 8, with an average temperature of 54°F.

The time of year with cooler water lasts for 6.6 months, from October 30 to May 18, with an average temperature below 35°F. The day of the year with the coolest water is December 15, with an average temperature of 30°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 Unalakleet 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 Unalakleet Airport for general outdoor tourist activities is from early July to early August, with a peak score in the second week of July.

Tourism Score

Tourism Score at Unalakleet AirportJanFebMarAprMayJunJulAugSepOctNovDec02468102.82.80.00.0 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 Unalakleet Airport for hot-weather activities is for the entire month of July.

Beach/Pool Score

Beach/Pool Score at Unalakleet AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.10.10.00.0precipitationprecipitationcloudsclouds
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 at Unalakleet Airport typically lasts for 3.6 months (112 days), from around May 26 to around September 15, rarely starting before May 6 or after June 14, and rarely ending before August 25 or after October 6.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Unalakleet Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2650%May 2650%Sep 1550%Sep 1550%Jun 1490%Jun 1490%Aug 2590%Aug 2590%May 610%May 610%Oct 610%Oct 610%0%Nov 280%Nov 28Jul 20100%Jul 20100%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 Unalakleet Airport should appear around June 26, only rarely appearing before June 14 or after July 13.

Growing Degree Days

Growing Degree Days at Unalakleet AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F100°F200°F300°F400°F500°F600°FJun 2690°FJun 2690°FDec 31453°FDec 31453°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 3.1 months, from April 23 to July 26, with an average daily incident shortwave energy per square meter above 4.4 kWh. The brightest day of the year is June 6, with an average of 5.5 kWh.

The darker period of the year lasts for 4.3 months, from October 14 to February 23, with an average daily incident shortwave energy per square meter below 1.1 kWh. The darkest day of the year is December 22, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Unalakleet AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJun 65.5 kWhJun 65.5 kWhDec 220.0 kWhDec 220.0 kWhApr 234.4 kWhApr 234.4 kWhJul 264.4 kWhJul 264.4 kWhOct 141.1 kWhOct 141.1 kWhFeb 231.1 kWhFeb 231.1 kWh
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 Unalakleet Airport are 63.888 deg latitude, -160.799 deg longitude, and 7 ft elevation.

The topography within 2 miles of Unalakleet Airport contains significant variations in elevation, with a maximum elevation change of 492 feet and an average elevation above sea level of 39 feet. Within 10 miles contains significant variations in elevation (1,230 feet). Within 50 miles contains very significant variations in elevation (3,225 feet).

The area within 2 miles of Unalakleet Airport is covered by water (53%), shrubs (29%), and herbaceous vegetation (16%), within 10 miles by water (46%) and shrubs (43%), and within 50 miles by shrubs (49%) and water (37%).

Data Sources

This report illustrates the typical weather at Unalakleet 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

Unalakleet 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 are Koyuk Airport, St. Michael Airport, Anvik Airport, Holy Cross Airport, Kaltag Airport, and Golovin 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.