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Average Weather at Deadhorse Airport Alaska, United States

At Deadhorse Airport, the summers are cold; the winters are long, frigid, and windy; and it is dry and overcast year round. Over the course of the year, the temperature typically varies from -22°F to 56°F and is rarely below -41°F or above 69°F.

The warm season lasts for 3.0 months, from June 8 to September 8, with an average daily high temperature above 42°F. The hottest day of the year is July 28, with an average high of 56°F and low of 41°F.

The cold season lasts for 4.7 months, from November 17 to April 7, with an average daily high temperature below 4°F. The coldest day of the year is February 9, with an average low of -22°F and high of -9°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 Deadhorse Airport12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecfrigidfreezingchillycold
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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.

Clouds

At Deadhorse 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 Deadhorse Airport begins around May 1 and lasts for 5.5 months, ending around October 18. On June 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 36% of the time, and overcast or mostly cloudy 64% of the time.

The cloudier part of the year begins around October 18 and lasts for 6.5 months, ending around May 1. On January 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 88% of the time, and clear, mostly clear, or partly cloudy 12% of the time.

Cloud Cover

Cloud Cover at Deadhorse Airportclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 2188%Jan 2188%Jun 2764%Jun 2764%May 176%May 176%Oct 1876%Oct 1876%overcastmostly cloudypartly cloudymostly clearclear
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 Deadhorse Airport varies throughout the year.

The wetter season lasts 3.2 months, from June 20 to September 25, with a greater than 12% chance of a given day being a wet day. The chance of a wet day peaks at 23% on August 15.

The drier season lasts 8.8 months, from September 25 to June 20. The smallest chance of a wet day is 2% on March 24.

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 Deadhorse Airport changes throughout the year.

Snow alone is the most common for 7.8 months, from September 26 to May 21. The highest chance of a day with snow alone is 5% on October 5.

Rain alone is the most common for 4.2 months, from May 21 to September 26. The highest chance of a day with rain alone is 22% on August 12.

Daily Chance of Precipitation

Daily Chance of Precipitation at Deadhorse Airportsnowrainsnow0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecAug 1523%Aug 1523%Mar 242%Mar 242%May 217%May 217%Sep 2612%Sep 2612%Jan 14%Jan 14%Jun 2012%Jun 2012%snowrain
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. Deadhorse Airport experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 3.3 months, from June 10 to September 18, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 10, with an average total accumulation of 1.2 inches.

The rainless period of the year lasts for 8.7 months, from September 18 to June 10. The least rain falls around March 16, with and average total accumulation of 0.0 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

The sliding 31-day liquid-equivalent quantity of snowfall at Deadhorse Airport does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Deadhorse Airportsnowsnow0.0 in0.2 in0.4 in0.6 in0.8 in1.0 in1.2 in1.4 inJanFebMarAprMayJunJulAugSepOctNovDecOct 50.2 inOct 50.2 inJul 140.0 inJul 140.0 inMay 200.2 inMay 200.2 inJan 150.1 inJan 150.1 inNov 170.1 inNov 170.1 inSep 30.1 inSep 30.1 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

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

In the summer at Deadhorse Airport during 2017, the Sun is continuously above the horizon for 2.4 months, rising at 1:55 AM on May 15, and not setting again until 1:40 AM on July 28.

In the winter at Deadhorse Airport during 2017, the Sun is continuously below the horizon for 1.8 months, setting at 1:05 PM on November 23, and not rising again until 12:45 PM on January 17.

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.

Daylight saving time (DST) is observed at Deadhorse 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 Deadhorse Airport2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJanFebMarAprMayJunJulAugSepOctNovDecMay 151:55 AMMay 151:55 AM1:40 AMJul 271:40 AMJul 271:05 PMNov 231:05 PMNov 23Jan 1712:45 PMJan 1712:45 PMMar 12DSTMar 12DSTdaynightnightnightnight
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 Deadhorse 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 Deadhorse Airport0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 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 at Deadhorse Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.8 months, from September 20 to May 15, with average wind speeds of more than 5.9 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 6.8 miles per hour.

The calmer time of year lasts for 4.2 months, from May 15 to September 20. The calmest day of the year is July 29, with an average hourly wind speed of 5.0 miles per hour.

Average Wind Speed

Average Wind Speed at Deadhorse Airportwindywindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mph12 mphJanFebMarAprMayJunJulAugSepOctNovDecJan 126.8 mphJan 126.8 mphJul 295.0 mphJul 295.0 mphSep 205.9 mphSep 205.9 mphMay 155.9 mphMay 155.9 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 Deadhorse Airport is from the east throughout the year.

Wind Direction

Wind Direction at Deadhorse Airport0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
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

Deadhorse 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 1.7 months, from July 21 to September 11, with an average temperature above 34°F. The day of the year with the warmest water is August 17, with an average temperature of 36°F.

The time of year with cooler water lasts for 7.6 months, from October 21 to June 8, with an average temperature below 30°F. The day of the year with the coolest water is February 9, with an average temperature of 29°F.

Average Water Temperature

Average Water Temperature at Deadhorse Airportwarmcoolcool28°F30°F32°F34°F36°F38°F40°FJanFebMarAprMayJunJulAugSepOctNovDecAug 1736°FAug 1736°F29°FFeb 929°FFeb 9Jul 2134°FJul 2134°FOct 2130°FOct 2130°FJun 830°FJun 830°F
The daily average water temperature (purple line), 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 2.6 months, from May 5 to July 23, with an average daily incident shortwave energy per square meter above 4.6 kWh. The brightest day of the year is June 21, with an average of 5.9 kWh.

The darker period of the year lasts for 5.5 months, from September 28 to March 12, with an average daily incident shortwave energy per square meter below 1.2 kWh. The darkest day of the year is December 10, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Deadhorse Airportbrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJanFebMarAprMayJunJulAugSepOctNovDecJun 215.9 kWhJun 215.9 kWhDec 100.0 kWhDec 100.0 kWhMay 54.7 kWhMay 54.7 kWhJul 234.6 kWhJul 234.6 kWhSep 281.2 kWhSep 281.2 kWhMar 121.2 kWhMar 121.2 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 Deadhorse Airport are 70.195 deg latitude, -148.465 deg longitude, and 49 ft elevation.

The topography within 2 miles of Deadhorse Airport is essentially flat, with a maximum elevation change of 46 feet and an average elevation above sea level of 51 feet. Within 10 miles is essentially flat (141 feet). Within 50 miles contains only modest variations in elevation (1,030 feet).

The area within 2 miles of Deadhorse Airport is covered by sparse vegetation (36%), grassland (31%), water (14%), and herbaceous vegetation (14%), within 10 miles by grassland (41%) and sparse vegetation (32%), and within 50 miles by water (39%) and grassland (36%).

Data Sources

This report illustrates the typical weather at Deadhorse 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

Deadhorse 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 Nuiqsut Airport and Barter Island LRRS 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.