Average Weather in May in Maple Valley Washington, United States
Daily high temperatures increase by 5°F, from 62°F to 68°F, rarely falling below 53°F or exceeding 79°F.
Daily low temperatures increase by 5°F, from 45°F to 51°F, rarely falling below 39°F or exceeding 56°F.
For reference, on August 3, the hottest day of the year, temperatures in Maple Valley typically range from 58°F to 79°F, while on January 1, the coldest day of the year, they range from 35°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 Maple Valley experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 61% throughout the month.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 40% of the time.
For reference, on November 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 77%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
Cloud Cover Categories in May
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 Maple Valley, the chance of a wet day over the course of May is decreasing, starting the month at 37% and ending it at 33%.
For reference, the year's highest daily chance of a wet day is 60% on November 18, and its lowest chance is 9% on August 5.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Maple Valley is decreasing, starting the month at 3.0 inches, when it rarely exceeds 5.0 inches or falls below 1.2 inches, and ending the month at 2.4 inches, when it rarely exceeds 4.1 inches or falls below 0.7 inches.
Average Monthly Rainfall in May
Over the course of May in Maple Valley, 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, 24 seconds, and weekly increase of 16 minutes, 51 seconds.
The shortest day of the month is May 1, with 14 hours, 28 minutes of daylight and the longest day is May 31, with 15 hours, 40 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Maple Valley is 5:51 AM on May 1 and the earliest sunrise is 36 minutes earlier at 5:16 AM on May 31.
The earliest sunset is 8:19 PM on May 1 and the latest sunset is 37 minutes later at 8:56 PM on May 31.
Daylight saving time is observed in Maple Valley during 2019, 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 5:11 AM and sets 15 hours, 57 minutes later, at 9:08 PM, while on December 22, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 27 minutes later, at 4:20 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Maple Valley is essentially constant during May, remaining around 0% throughout.
For reference, on July 29, 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Maple Valley is essentially constant during May, remaining within 0.2 miles per hour of 3.6 miles per hour throughout.
For reference, on December 4, the windiest day of the year, the daily average wind speed is 5.4 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
Average Wind Speed in May
Wind Direction in May
Maple Valley 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 Maple Valley is gradually increasing during May, rising by 3°F, from 50°F to 53°F, over the course of the month.
Average Water Temperature in May
The growing season in Maple Valley typically lasts for 7.7 months (236 days), from around March 21 to around November 12, rarely starting before February 21 or after April 14, and rarely ending before October 24 or after December 7.
The month of May in Maple Valley 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 Maple Valley are increasing during May, increasing by 187°F, from 131°F to 318°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Maple Valley is gradually increasing during May, rising by 0.6 kWh, from 5.1 kWh to 5.8 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 Maple Valley are 47.393 deg latitude, -122.046 deg longitude, and 522 ft elevation.
The topography within 2 miles of Maple Valley contains only modest variations in elevation, with a maximum elevation change of 449 feet and an average elevation above sea level of 488 feet. Within 10 miles contains only modest variations in elevation (3,271 feet). Within 50 miles contains large variations in elevation (14,383 feet).
The area within 2 miles of Maple Valley is covered by trees (62%) and artificial surfaces (36%), within 10 miles by trees (48%) and artificial surfaces (34%), and within 50 miles by trees (54%) and shrubs (15%).
This report illustrates the typical weather in Maple Valley 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 Maple Valley.
For each station, the records are corrected for the elevation difference between that station and Maple Valley 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 Maple Valley is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Maple Valley and a given station.
The stations contributing to this reconstruction are: Renton Municipal Airport (64%, 17 kilometers, northwest); Pierce County Airport Thun Field (31%, 37 kilometers, southwest); and Stampede Pass (5%, 55 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .