Average Weather in April in Walla Walla East Washington, United States
Daily high temperatures increase by 8°F, from 60°F to 68°F, rarely falling below 51°F or exceeding 81°F.
Daily low temperatures increase by 5°F, from 42°F to 47°F, rarely falling below 35°F or exceeding 55°F.
For reference, on July 30, the hottest day of the year, temperatures in Walla Walla East typically range from 64°F to 93°F, while on December 29, the coldest day of the year, they range from 30°F to 40°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The month of April in Walla Walla East experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 61% to 53%.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 47% of the time.
For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Walla Walla East, the chance of a wet day over the course of April is gradually decreasing, starting the month at 24% and ending it at 21%.
For reference, the year's highest daily chance of a wet day is 37% on November 28, and its lowest chance is 7% on August 4.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Walla Walla East is essentially constant, remaining about 1.3 inches throughout, and rarely exceeding 2.6 inches or falling below 0.4 inches.
The lowest average 31-day accumulation is 1.2 inches on April 22.
Average Monthly Rainfall in April
Over the course of April in Walla Walla East, 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, 30 minutes, implying an average daily increase of 3 minutes, 6 seconds, and weekly increase of 21 minutes, 39 seconds.
The shortest day of the month is April 1, with 12 hours, 49 minutes of daylight and the longest day is April 30, with 14 hours, 19 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Walla Walla East is 6:32 AM on April 1 and the earliest sunrise is 51 minutes earlier at 5:41 AM on April 30.
The earliest sunset is 7:22 PM on April 1 and the latest sunset is 38 minutes later at 8:00 PM on April 30.
Daylight saving time is observed in Walla Walla East during 2018, but it neither starts nor ends during April, 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, 46 minutes later, at 8:47 PM, while on December 21, the shortest day of the year, it rises at 7:32 AM and sets 8 hours, 38 minutes later, at 4:10 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in Walla Walla East is essentially constant during April, remaining around 0% throughout.
For reference, on July 6, 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 April
The average hourly wind speed in Walla Walla East is gradually decreasing during April, decreasing from 7.6 miles per hour to 7.1 miles per hour over the course of the month.
For reference, on November 19, the windiest day of the year, the daily average wind speed is 8.2 miles per hour, while on September 9, the calmest day of the year, the daily average wind speed is 6.6 miles per hour.
Average Wind Speed in April
Wind Direction in April
The growing season in Walla Walla East typically lasts for 7.7 months (234 days), from around March 14 to around November 4, rarely starting before February 15 or after April 8, and rarely ending before October 14 or after November 26.
The month of April in Walla Walla East is more likely than not fully within the growing season, with the chance that a given day is in the growing season increasing from 81% to 100% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in April
The average accumulated growing degree days in Walla Walla East are gradually increasing during April, increasing by 147°F, from 97°F to 245°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Walla Walla East is increasing during April, rising by 1.4 kWh, from 4.4 kWh to 5.8 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Walla Walla East are 46.052 deg latitude, -118.304 deg longitude, and 1,053 ft elevation.
The topography within 2 miles of Walla Walla East contains only modest variations in elevation, with a maximum elevation change of 381 feet and an average elevation above sea level of 1,043 feet. Within 10 miles contains only modest variations in elevation (3,684 feet). Within 50 miles also contains extreme variations in elevation (6,089 feet).
The area within 2 miles of Walla Walla East is covered by cropland (59%) and artificial surfaces (40%), within 10 miles by cropland (72%) and grassland (12%), and within 50 miles by shrubs (39%) and cropland (29%).
This report illustrates the typical weather in Walla Walla East 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 Walla Walla East.
For each station, the records are corrected for the elevation difference between that station and Walla Walla East 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 Walla Walla East is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Walla Walla East and a given station.
The stations contributing to this reconstruction are: Walla Walla Regional Airport (96%, 5.0 kilometers, north); Eastern Oregon Regional Airport (3.1%, 58 kilometers, southwest); and Meacham, Meacham (1.4%, 61 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .