Average Weather in Tok Alaska, United States
In Tok, the summers are long and cool, the winters are frigid and snowy, and it is mostly cloudy year round. Over the course of the year, the temperature typically varies from -15°F to 69°F and is rarely below -43°F or above 78°F.
Based on the tourism score, the best time of year to visit Tok for warm-weather activities is from late June to late July.
The warm season lasts for 4.0 months, from May 12 to September 10, with an average daily high temperature above 55°F. The hottest day of the year is July 7, with an average high of 69°F and low of 49°F.
The cold season lasts for 3.5 months, from November 8 to February 23, with an average daily high temperature below 13°F. The coldest day of the year is January 16, with an average low of -15°F and high of -2°F.
Average High and Low Temperature
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
In Tok, 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 in Tok begins around April 12 and lasts for 5.0 months, ending around September 14. On May 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 42% of the time, and overcast or mostly cloudy 58% of the time.
The cloudier part of the year begins around September 14 and lasts for 7.0 months, ending around April 12. On December 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 70% of the time, and clear, mostly clear, or partly cloudy 30% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Tok varies throughout the year.
The wetter season lasts 4.8 months, from May 19 to October 11, with a greater than 19% chance of a given day being a wet day. The chance of a wet day peaks at 34% on July 8.
The drier season lasts 7.2 months, from October 11 to May 19. The smallest chance of a wet day is 4% on March 16.
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 in Tok changes throughout the year.
Snow alone is the most common for 6.1 months, from October 10 to April 13. The highest chance of a day with snow alone is 11% on December 19.
Rain alone is the most common for 5.9 months, from April 13 to October 10. The highest chance of a day with rain alone is 34% on July 8.
Daily Chance of Precipitation
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. Tok experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 5.3 months, from May 1 to October 10, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 3, with an average total accumulation of 2.7 inches.
The rainless period of the year lasts for 6.7 months, from October 10 to May 1. The least rain falls around February 10, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
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. Tok experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 7.9 months, from September 9 to May 5, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around October 25, with an average total liquid-equivalent accumulation of 0.5 inches.
The snowless period of the year lasts for 4.1 months, from May 5 to September 9. The least snow falls around July 10, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Tok varies extremely over the course of the year. In 2017, the shortest day is December 21, with 4 hours, 33 minutes of daylight; the longest day is June 20, with 20 hours, 32 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 3:17 AM on June 19, and the latest sunrise is 6 hours, 57 minutes later at 10:14 AM on December 25. The earliest sunset is at 2:45 PM on December 17, and the latest sunset is 9 hours, 4 minutes later at 11:49 PM on June 21.
Daylight saving time (DST) is observed in Tok 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
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 Tok, 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
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 Tok does not vary significantly over the course of the year, remaining within 0.3 miles per hour of 4.0 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction in Tok varies throughout the year.
The wind is most often from the east for 1.9 months, from February 22 to April 19 and for 1.7 months, from September 26 to November 17, with a peak percentage of 37% on March 22. The wind is most often from the west for 5.0 months, from April 19 to September 18, with a peak percentage of 62% on July 22. The wind is most often from the south for 1.1 weeks, from September 18 to September 26 and for 3.2 months, from November 17 to February 22, with a peak percentage of 29% on September 23.
Best Time of Year to Visit
To characterize how pleasant the weather is in Tok 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 Tok for general outdoor tourist activities is from late June to late July, with a peak score in the second week of July.
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 Tok for hot-weather activities is from late June to mid July, with a peak score in the first week of July.
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.
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 Tok typically lasts for 3.3 months (103 days), from around May 21 to around August 31, rarely starting before May 5 or after June 6, and rarely ending before August 15 or after September 17.
Time Spent in Various Temperature Bands and 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 in Tok should appear around June 1, only rarely appearing before May 22 or after June 12.
Growing Degree Days
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 3.4 months, from April 26 to August 7, with an average daily incident shortwave energy per square meter above 4.6 kWh. The brightest day of the year is June 12, with an average of 5.8 kWh.
The darker period of the year lasts for 4.2 months, from October 16 to February 22, 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 0.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Tok are 63.337 deg latitude, -142.986 deg longitude, and 1,631 ft elevation.
The topography within 2 miles of Tok is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 1,630 feet. Within 10 miles is essentially flat (1,739 feet). Within 50 miles contains very significant variations in elevation (7,756 feet).
The area within 2 miles of Tok is covered by trees (84%) and shrubs (13%), within 10 miles by trees (70%) and shrubs (20%), and within 50 miles by trees (46%) and shrubs (31%).
This report illustrates the typical weather in Tok, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Tok.
For each station, the records are corrected for the elevation difference between that station and Tok 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 Tok is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Tok and a given station.
The stations contributing to this reconstruction are: Northway Airport (58%, 67 kilometers, southeast); Allen Army Air Field (17%, 154 kilometers, northwest); Gulkana Airport (13%, 182 kilometers, southwest); and Eagle Airport (13%, 184 kilometers, northeast).
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.
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.