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Average Weather at Fort Yukon Airport Alaska, United States

At Fort Yukon Airport, the summers are comfortable and mostly cloudy and the winters are long, frigid, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from -24°F to 73°F and is rarely below -51°F or above 82°F.

Climate Summary

frigidcoolcomfortablecoolcoldfrigidJanFebMarAprMayJunJulAugSepOctNovDec48%48%31%31%overcastclearprecipitation: 1.4 inprecipitation: 1.4 in0.2 in0.2 inmuggy: 0%muggy: 0%drydrytourism score: 4.8tourism score: 4.80.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Fort Yukon Airport for warm-weather activities is from mid June to mid July.

Temperature

The warm season lasts for 3.7 months, from May 14 to September 6, with an average daily high temperature above 57°F. The hottest day of the year is July 3, with an average high of 73°F and low of 54°F.

The cold season lasts for 3.9 months, from November 8 to March 3, with an average daily high temperature below 8°F. The coldest day of the year is January 19, with an average low of -24°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 Fort Yukon AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfrigidfrigidcoldcoolcoolcomfortablevery coldfreezingfreezingvery 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.

Markovo, Russia (3,112 miles away) is the far-away foreign place with temperatures most similar to Fort Yukon Airport (view comparison).

Clouds

At Fort Yukon 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 Fort Yukon Airport begins around April 30 and lasts for 3.0 months, ending around July 30. On May 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 48% of the time, and overcast or mostly cloudy 52% of the time.

The cloudier part of the year begins around July 30 and lasts for 9.0 months, ending around April 30. On December 7, the cloudiest day of the year, the sky is overcast or mostly cloudy 69% of the time, and clear, mostly clear, or partly cloudy 31% of the time.

Cloud Cover Categories

Cloud Cover Categories at Fort Yukon AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2748%May 2748%Dec 731%Dec 731%Jul 3040%Jul 3040%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 Fort Yukon Airport varies throughout the year.

The wetter season lasts 4.5 months, from May 27 to October 11, with a greater than 14% chance of a given day being a wet day. The chance of a wet day peaks at 23% on August 23.

The drier season lasts 7.5 months, from October 11 to May 27. The smallest chance of a wet day is 4% on March 18.

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 Fort Yukon Airport changes throughout the year.

Snow alone is the most common for 6.4 months, from October 6 to April 19. The highest chance of a day with snow alone is 11% on January 2.

Rain alone is the most common for 5.6 months, from April 19 to October 6. The highest chance of a day with rain alone is 23% on August 23.

Daily Chance of Precipitation

Daily Chance of Precipitation at Fort Yukon AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 2323%Aug 2323%Mar 184%Mar 184%Apr 196%Apr 196%Oct 616%Oct 616%Jan 111%Jan 111%May 2714%May 2714%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. Fort Yukon Airport experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 4.7 months, from May 13 to October 2, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 10, with an average total accumulation of 1.4 inches.

The rainless period of the year lasts for 7.3 months, from October 2 to May 13. The least rain falls around November 23, with an 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

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. Fort Yukon Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.5 months, from September 15 to April 30, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around November 24, with an average total liquid-equivalent accumulation of 0.4 inches.

The snowless period of the year lasts for 4.5 months, from April 30 to September 15. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Fort Yukon AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.2 in0.4 in0.6 in0.8 in1.0 in1.2 in1.4 inNov 240.4 inNov 240.4 inJul 170.0 inJul 170.0 inOct 200.4 inOct 200.4 inSep 150.1 inSep 150.1 inApr 300.1 inApr 300.1 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, Fort Yukon Airport experiences polar day (also known as the midnight Sun) during the summer. 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 Fort Yukon Airport during 2017, the Sun is continuously above the horizon for 1.0 months, rising at 1:43 AM on June 5, and not setting again until 1:32 AM on July 7.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Fort Yukon AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 13 minMar 2012 hr, 13 minMar 2024 hr, 0 minJun 2024 hr, 0 minJun 2012 hr, 16 minSep 2212 hr, 16 minSep 222 hr, 9 minDec 212 hr, 9 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.

Daylight saving time (DST) is observed at Fort Yukon 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 Fort Yukon AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 51:43 AMJun 51:43 AM1:32 AMJul 61:32 AMJul 6Dec 191:43 PMDec 191:43 PM11:35 AMDec 2211:35 AMDec 22Mar 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 Fort Yukon 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 Fort Yukon AirportJanFebMarAprMayJunJulAugSepOctNovDec0%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 at Fort Yukon Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.3 months, from November 9 to May 19, with average wind speeds of more than 6.1 miles per hour. The windiest day of the year is March 12, with an average hourly wind speed of 7.3 miles per hour.

The calmer time of year lasts for 5.7 months, from May 19 to November 9. The calmest day of the year is September 1, with an average hourly wind speed of 4.9 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 at Fort Yukon Airport varies throughout the year.

The wind is most often from the north for 1.9 months, from March 21 to May 18 and for 1.0 months, from October 4 to November 4, with a peak percentage of 47% on April 20. The wind is most often from the east for 2.0 weeks, from May 18 to June 1; for 4.0 weeks, from September 6 to October 4; and for 4.5 months, from November 4 to March 21, with a peak percentage of 36% on September 24. The wind is most often from the west for 3.2 months, from June 1 to September 6, with a peak percentage of 56% on July 29.

Wind Direction

Wind Direction at Fort Yukon AirportENEWENEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westnortheastsouth
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).

Best Time of Year to Visit

To characterize how pleasant the weather is at Fort Yukon 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 Fort Yukon Airport for general outdoor tourist activities is from mid June to mid July, with a peak score in the first week of July.

Tourism Score

Tourism Score at Fort Yukon AirportJanFebMarAprMayJunJulAugSepOctNovDec02468104.84.80.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
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 Fort Yukon Airport for hot-weather activities is from late June to mid July, with a peak score in the first week of July.

Beach/Pool Score

Beach/Pool Score at Fort Yukon AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.90.90.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
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 Fort Yukon Airport typically lasts for 3.4 months (105 days), from around May 20 to around September 3, rarely starting before May 4 or after June 6, and rarely ending before August 16 or after September 21.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Fort Yukon Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2050%May 2050%Sep 350%Sep 350%Jun 690%Jun 690%Aug 1690%Aug 1690%May 410%May 410%Sep 2110%Sep 2110%0%Feb 220%Feb 22Jul 13100%Jul 13100%frigidcoldcoolcomfortablefreezingvery 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 Fort Yukon Airport should appear around May 27, only rarely appearing before May 19 or after June 5.

Growing Degree Days

Growing Degree Days at Fort Yukon AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F200°F400°F600°F800°F1,000°F1,200°FMay 2790°FMay 2790°FAug 8900°FAug 8900°FDec 311,079°FDec 311,079°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 2.8 months, from May 2 to July 29, with an average daily incident shortwave energy per square meter above 4.8 kWh. The brightest day of the year is June 21, with an average of 6.0 kWh.

The darker period of the year lasts for 4.8 months, from October 8 to March 1, with an average daily incident shortwave energy per square meter below 1.2 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 Fort Yukon AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJun 216.0 kWhJun 216.0 kWhDec 220.0 kWhDec 220.0 kWhMay 24.8 kWhMay 24.8 kWhJul 294.8 kWhJul 294.8 kWhOct 81.2 kWhOct 81.2 kWhMar 11.2 kWhMar 11.2 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 Fort Yukon Airport are 66.571 deg latitude, -145.250 deg longitude, and 430 ft elevation.

The topography within 2 miles of Fort Yukon Airport is essentially flat, with a maximum elevation change of 39 feet and an average elevation above sea level of 429 feet. Within 10 miles is also essentially flat (69 feet). Within 50 miles is essentially flat (1,155 feet).

The area within 2 miles of Fort Yukon Airport is covered by trees (66%), sparse vegetation (20%), and water (12%), within 10 miles by trees (75%) and sparse vegetation (12%), and within 50 miles by trees (62%) and shrubs (18%).

Data Sources

This report illustrates the typical weather at Fort Yukon 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

Fort Yukon 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.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

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.