Average Weather in July at Eielson Air Force Base Alaska, United States
Daily high temperatures decrease by 2°F, from 73°F to 71°F, rarely falling below 61°F or exceeding 83°F. The highest daily average high temperature is 73°F on July 4.
Daily low temperatures are around 52°F, rarely falling below 45°F or exceeding 58°F. The highest daily average low temperature is 53°F on July 11.
For reference, on July 4, the hottest day of the year, temperatures at Eielson Air Force Base typically range from 52°F to 73°F, while on January 18, the coldest day of the year, they range from -14°F to 2°F.
Average High and Low Temperature in July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. The horizontal axis is the day, 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 July
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
Kotik, Russia (3,459 miles away); Зуунмод, Mongolia (3,727 miles); and Mogzon, Russia (3,372 miles) are the far-away foreign places with temperatures most similar to Eielson Air Force Base (view comparison).
The month of July at Eielson Air Force Base experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 62% throughout the month.
The clearest day of the month is July 2, with clear, mostly clear, or partly cloudy conditions 40% of the time.
For reference, on September 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 65%, while on March 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 46%.
Cloud Cover Categories in July
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Eielson Air Force Base, the chance of a wet day over the course of July is essentially constant, remaining around 32% throughout.
For reference, the year's highest daily chance of a wet day is 33% on July 12, and its lowest chance is 5% on March 22.
Probability of Precipitation in July
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during July at Eielson Air Force Base is essentially constant, remaining about 2.5 inches throughout, and rarely exceeding 4.4 inches or falling below 1.0 inches.
The highest average 31-day accumulation is 2.7 inches on July 11.
Average Monthly Rainfall in July
Over the course of July at Eielson Air Force Base, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 3 hours, 2 minutes, implying an average daily decrease of 6 minutes, 5 seconds, and weekly decrease of 42 minutes, 33 seconds.
The shortest day of the month is July 31, with 18 hours, 14 minutes of daylight and the longest day is July 1, with 21 hours, 17 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month at Eielson Air Force Base is 3:13 AM on July 1 and the latest sunrise is 1 hour, 33 minutes later at 4:46 AM on July 31.
The latest sunset is 12:29 AM on July 1 and the earliest sunset is 1 hour, 29 minutes earlier at 11:00 PM on July 31.
Daylight saving time is observed at Eielson Air Force Base during 2019, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 3:00 AM and sets 21 hours, 39 minutes later, at 12:39 AM, while on December 22, the shortest day of the year, it rises at 10:52 AM and sets 3 hours, 48 minutes later, at 2:41 PM.
Sunrise & Sunset with Twilight in July
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 chance that a given day will be muggy at Eielson Air Force Base is essentially constant during July, remaining around 0% throughout.
For reference, on July 8, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in July
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Eielson Air Force Base is essentially constant during July, remaining within 0.1 miles per hour of 4.4 miles per hour throughout.
For reference, on January 8, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on July 14, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.
The lowest daily average wind speed during July is 4.3 miles per hour on July 14.
Average Wind Speed in July
Wind Direction in July
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 Eielson Air Force Base typically lasts for 3.8 months (115 days), from around May 14 to around September 7, rarely starting before April 30 or after May 30, and rarely ending before August 18 or after September 26.
The month of July at Eielson Air Force Base is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
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
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.
The average accumulated growing degree days at Eielson Air Force Base are increasing during July, increasing by 364°F, from 488°F to 852°F, over the course of the month.
Growing Degree Days in July
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 at Eielson Air Force Base is gradually decreasing during July, falling by 0.9 kWh, from 5.5 kWh to 4.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Eielson Air Force Base are 64.664 deg latitude, -147.099 deg longitude, and 545 ft elevation.
The topography within 2 miles of Eielson Air Force Base is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 540 feet. Within 10 miles is essentially flat (1,522 feet). Within 50 miles contains very significant variations in elevation (6,076 feet).
The area within 2 miles of Eielson Air Force Base is covered by trees (51%), sparse vegetation (30%), and artificial surfaces (12%), within 10 miles by trees (75%), and within 50 miles by trees (68%) and shrubs (21%).
This report illustrates the typical weather at Eielson Air Force Base year round, 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
Eielson Air Force Base 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.
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.