Average Weather in August in McChord Air Force Base Washington, United States
Daily high temperatures decrease by 3°F, from 79°F to 76°F, rarely falling below 68°F or exceeding 89°F. The highest daily average high temperature is 79°F on August 4.
Daily low temperatures decrease by 3°F, from 55°F to 52°F, rarely falling below 45°F or exceeding 60°F. The highest daily average low temperature is 55°F on August 2.
For reference, on August 3, the hottest day of the year, temperatures in McChord Air Force Base typically range from 55°F to 79°F, while on January 1, the coldest day of the year, they range from 34°F to 45°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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 August
The month of August in McChord Air Force Base experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 23% to 33%. The lowest chance of overcast or mostly cloudy conditions is 23% on August 3.
The clearest day of the month is August 3, with clear, mostly clear, or partly cloudy conditions 77% of the time.
For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 75%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
Cloud Cover Categories in August
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. In McChord Air Force Base, the chance of a wet day over the course of August is rapidly increasing, starting the month at 7% and ending it at 14%.
For reference, the year's highest daily chance of a wet day is 58% on November 18, and its lowest chance is 7% on August 5.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in McChord Air Force Base is increasing, starting the month at 0.5 inches, when it rarely exceeds 1.4 inches, and ending the month at 1.3 inches, when it rarely exceeds 3.0 inches or falls below 0.1 inches.
Average Monthly Rainfall in August
Over the course of August in McChord Air Force Base, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 30 minutes, implying an average daily decrease of 3 minutes, 0 seconds, and weekly decrease of 21 minutes, 3 seconds.
The shortest day of the month is August 31, with 13 hours, 23 minutes of daylight and the longest day is August 1, with 14 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in McChord Air Force Base is 5:49 AM on August 1 and the latest sunrise is 39 minutes later at 6:28 AM on August 31.
The latest sunset is 8:42 PM on August 1 and the earliest sunset is 51 minutes earlier at 7:51 PM on August 31.
Daylight saving time is observed in McChord Air Force Base during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:14 AM and sets 15 hours, 55 minutes later, at 9:09 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 29 minutes later, at 4:22 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in McChord Air Force Base is essentially constant during August, remaining around 0% throughout.
For reference, on September 13, 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 August
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in McChord Air Force Base is essentially constant during August, remaining within 0.1 miles per hour of 3.4 miles per hour throughout.
For reference, on November 30, the windiest day of the year, the daily average wind speed is 5.3 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 3.2 miles per hour.
The lowest daily average wind speed during August is 3.2 miles per hour on August 2.
Average Wind Speed in August
Wind Direction in August
McChord Air Force Base 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 surface water temperature in McChord Air Force Base is essentially constant during August, remaining around 57°F throughout.
The highest average surface water temperature during August is 57°F on August 25.
Average Water Temperature in August
The growing season in McChord Air Force Base typically lasts for 6.4 months (196 days), from around April 14 to around October 27, rarely starting before March 24 or after May 5, and rarely ending before October 5 or after November 19.
The month of August in McChord Air Force Base is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
The average accumulated growing degree days in McChord Air Force Base are increasing during August, increasing by 445°F, from 1,090°F to 1,535°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in McChord Air Force Base is decreasing during August, falling by 1.3 kWh, from 6.7 kWh to 5.4 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of McChord Air Force Base are 47.134 deg latitude, -122.492 deg longitude, and 295 ft elevation.
The topography within 2 miles of McChord Air Force Base contains only modest variations in elevation, with a maximum elevation change of 112 feet and an average elevation above sea level of 296 feet. Within 10 miles contains only modest variations in elevation (574 feet). Within 50 miles contains significant variations in elevation (14,383 feet).
The area within 2 miles of McChord Air Force Base is covered by artificial surfaces (70%) and trees (18%), within 10 miles by artificial surfaces (54%) and trees (27%), and within 50 miles by trees (52%) and shrubs (17%).
This report illustrates the typical weather in McChord 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
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in McChord Air Force Base.
For each station, the records are corrected for the elevation difference between that station and McChord Air Force Base 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 McChord Air Force Base is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between McChord Air Force Base and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .