Average Weather in May in Waterville Washington, United States
In Waterville, the month of May is characterized by rising daily high temperatures, with daily highs increasing by 8°F, from 62°F to 70°F over the course of the month, and rarely exceeding 81°F or dropping below 53°F.
Daily low temperatures increase by 8°F, from 39°F to 47°F, rarely falling below 32°F or exceeding 55°F.
For reference, on August 2, the hottest day of the year, temperatures in Waterville typically range from 58°F to 84°F, while on December 30, the coldest day of the year, they range from 18°F to 26°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 Waterville experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 49% throughout the month.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 52% of the time.
For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 80%.
Cloud Cover in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Waterville, the chance of a wet day over the course of May is gradually increasing, starting the month at 12% and ending it at 14%.
For reference, the year's highest daily chance of a wet day is 32% on November 28, and its lowest chance is 5% on July 21.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Waterville is essentially constant, remaining about 0.7 inches throughout, and rarely exceeding 1.8 inches or falling below 0.1 inches.
The highest average 31-day accumulation is 0.8 inches on May 27.
Average Monthly Rainfall in May
Over the course of May in Waterville, 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, 52 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 Waterville is 5:42 AM on May 1 and the earliest sunrise is 36 minutes earlier at 5:06 AM on May 31.
The earliest sunset is 8:13 PM on May 1 and the latest sunset is 37 minutes later at 8:49 PM on May 31.
Daylight saving time is observed in Waterville 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 5:02 AM and sets 15 hours, 60 minutes later, at 9:02 PM, while on December 21, the shortest day of the year, it rises at 7:46 AM and sets 8 hours, 25 minutes later, at 4:11 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Waterville is essentially constant during May, remaining around 0% throughout.
Humidity Comfort Levels in May
The average hourly wind speed in Waterville is essentially constant during May, remaining around 3.3 miles per hour throughout.
For reference, on June 8, the windiest day of the year, the daily average wind speed is 3.3 miles per hour, while on January 5, the calmest day of the year, the daily average wind speed is 2.5 miles per hour.
Average Wind Speed in May
Wind Direction in May
The average daily incident shortwave solar energy in Waterville is gradually increasing during May, rising by 0.8 kWh, from 6.0 kWh to 6.8 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 Waterville are 47.647 deg latitude, -120.071 deg longitude, and 2,703 ft elevation.
The topography within 2 miles of Waterville contains only modest variations in elevation, with a maximum elevation change of 410 feet and an average elevation above sea level of 2,670 feet. Within 10 miles contains only modest variations in elevation (3,553 feet). Within 50 miles also contains extreme variations in elevation (8,743 feet).
The area within 2 miles of Waterville is covered by cropland (84%) and grassland (13%), within 10 miles by shrubs (43%) and cropland (37%), and within 50 miles by shrubs (47%) and trees (17%).
This report illustrates the typical weather in Waterville 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 Waterville.
For each station, the records are corrected for the elevation difference between that station and Waterville 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 Waterville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Waterville and a given station.
The stations contributing to this reconstruction are: Pangborn Field (50%, 29 kilometers, south); Ephrata Municipal Airport (33%, 56 kilometers, southeast); and Omak Airport (17%, 100 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .