Average Weather in August in Lake Marcel-Stillwater Washington, United States
The highest daily average high temperature is 78°F on August 4.
Daily low temperatures decrease by 2°F, from 59°F to 57°F, rarely falling below 52°F or exceeding 64°F. The highest daily average low temperature is 59°F on August 3.
For reference, on August 3, the hottest day of the year, temperatures in Lake Marcel-Stillwater typically range from 59°F to 78°F, while on December 23, the coldest day of the year, they range from 36°F to 44°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 Lake Marcel-Stillwater experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 29% to 37%. The lowest chance of overcast or mostly cloudy conditions is 28% on August 3.
The clearest day of the month is August 3, with clear, mostly clear, or partly cloudy conditions 72% of the time.
For reference, on November 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Lake Marcel-Stillwater, the chance of a wet day over the course of August is rapidly increasing, starting the month at 10% and ending it at 18%.
For reference, the year's highest daily chance of a wet day is 62% on November 18, and its lowest chance is 10% on August 10.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Lake Marcel-Stillwater is increasing, starting the month at 0.8 inches, when it rarely exceeds 2.0 inches or falls below 0.1 inches, and ending the month at 1.7 inches, when it rarely exceeds 3.6 inches or falls below 0.2 inches.
Average Monthly Rainfall in August
Over the course of August in Lake Marcel-Stillwater, 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, 32 minutes, implying an average daily decrease of 3 minutes, 4 seconds, and weekly decrease of 21 minutes, 30 seconds.
The shortest day of the month is August 31, with 13 hours, 25 minutes of daylight and the longest day is August 1, with 14 hours, 57 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Lake Marcel-Stillwater is 5:44 AM on August 1 and the latest sunrise is 40 minutes later at 6:24 AM on August 31.
The latest sunset is 8:42 PM on August 1 and the earliest sunset is 52 minutes earlier at 7:49 PM on August 31.
Daylight saving time is observed in Lake Marcel-Stillwater 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 5:09 AM and sets 16 hours, 0 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, 25 minutes later, at 4:18 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Lake Marcel-Stillwater is essentially constant during August, remaining around 0% throughout.
For reference, on August 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 August
The average hourly wind speed in Lake Marcel-Stillwater is essentially constant during August, remaining within 0.1 miles per hour of 2.8 miles per hour throughout.
For reference, on December 29, the windiest day of the year, the daily average wind speed is 5.4 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 2.7 miles per hour.
The lowest daily average wind speed during August is 2.7 miles per hour on August 9.
Average Wind Speed in August
Wind Direction in August
Lake Marcel-Stillwater 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 Lake Marcel-Stillwater is essentially constant during August, remaining around 56°F throughout.
The highest average surface water temperature during August is 56°F on August 19.
Average Water Temperature in August
The growing season in Lake Marcel-Stillwater typically lasts for 8.7 months (266 days), from around March 1 to around November 22, rarely starting before February 2 or after March 31, and rarely ending before October 29 or after December 18.
The month of August in Lake Marcel-Stillwater 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 Lake Marcel-Stillwater are rapidly increasing during August, increasing by 476°F, from 1,129°F to 1,605°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Lake Marcel-Stillwater is decreasing during August, falling by 1.3 kWh, from 6.5 kWh to 5.2 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 Lake Marcel-Stillwater are 47.693 deg latitude, -121.915 deg longitude, and 390 ft elevation.
The topography within 2 miles of Lake Marcel-Stillwater contains significant variations in elevation, with a maximum elevation change of 597 feet and an average elevation above sea level of 325 feet. Within 10 miles contains significant variations in elevation (3,127 feet). Within 50 miles contains large variations in elevation (10,531 feet).
The area within 2 miles of Lake Marcel-Stillwater is covered by trees (76%) and cropland (15%), within 10 miles by trees (68%) and shrubs (10%), and within 50 miles by trees (54%) and shrubs (14%).
This report illustrates the typical weather in Lake Marcel-Stillwater 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Lake Marcel-Stillwater.
For each station, the records are corrected for the elevation difference between that station and Lake Marcel-Stillwater 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 Lake Marcel-Stillwater is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lake Marcel-Stillwater and a given station.
The stations contributing to this reconstruction are: Renton Municipal Airport (50%, 32 kilometers, southwest); Snohomish County Airport (Paine Field) (43%, 36 kilometers, northwest); and Stampede Pass (7%, 63 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .