Average Weather in May in Lake Marcel-Stillwater Washington, United States
Daily low temperatures increase by 5°F, from 47°F to 52°F, rarely falling below 40°F or exceeding 57°F.
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 May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
The month of May in Lake Marcel-Stillwater 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 May 22, with clear, mostly clear, or partly cloudy conditions 39% 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 May
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 May is gradually decreasing, starting the month at 38% and ending it at 35%.
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 May
The average sliding 31-day rainfall during May in Lake Marcel-Stillwater is decreasing, starting the month at 3.4 inches, when it rarely exceeds 5.6 inches or falls below 1.3 inches, and ending the month at 2.7 inches, when it rarely exceeds 4.6 inches or falls below 0.8 inches.
Average Monthly Rainfall in May
Over the course of May in Lake Marcel-Stillwater, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 12 minutes, implying an average daily increase of 2 minutes, 25 seconds, and weekly increase of 16 minutes, 53 seconds.
The shortest day of the month is May 1, with 14 hours, 31 minutes of daylight and the longest day is May 31, with 15 hours, 43 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Lake Marcel-Stillwater is 5:49 AM on May 1 and the earliest sunrise is 36 minutes earlier at 5:14 AM on May 31.
The earliest sunset is 8:20 PM on May 1 and the latest sunset is 37 minutes later at 8:57 PM on May 31.
Daylight saving time is observed in Lake Marcel-Stillwater during 2017, but it neither starts nor ends during May, 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 May
The chance that a given day will be muggy in Lake Marcel-Stillwater is essentially constant during May, 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 May
The average hourly wind speed in Lake Marcel-Stillwater is essentially constant during May, remaining within 0.2 miles per hour of 3.4 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.
Average Wind Speed in May
Wind Direction in May
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 gradually increasing during May, rising by 2°F, from 50°F to 52°F, over the course of the month.
Average Water Temperature in May
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 May in Lake Marcel-Stillwater is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in Lake Marcel-Stillwater are increasing during May, increasing by 192°F, from 140°F to 332°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Lake Marcel-Stillwater is gradually increasing during May, rising by 0.6 kWh, from 5.1 kWh to 5.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
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 .