Average Weather in April in Stilwell Oklahoma, United States
Daily high temperatures increase by 7°F, from 66°F to 74°F, rarely falling below 52°F or exceeding 82°F.
Daily low temperatures increase by 8°F, from 45°F to 53°F, rarely falling below 32°F or exceeding 64°F.
For reference, on July 24, the hottest day of the year, temperatures in Stilwell typically range from 70°F to 91°F, while on January 6, the coldest day of the year, they range from 28°F to 47°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 Stilwell experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 41% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 40% on April 15.
The clearest day of the month is April 15, with clear, mostly clear, or partly cloudy conditions 60% of the time.
For reference, on February 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, while on October 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Stilwell, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 29% and ending it at 37%.
For reference, the year's highest daily chance of a wet day is 44% on May 21, and its lowest chance is 16% on January 19.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Stilwell is rapidly increasing, starting the month at 3.6 inches, when it rarely exceeds 6.1 inches or falls below 1.5 inches, and ending the month at 4.8 inches, when it rarely exceeds 8.0 inches or falls below 1.9 inches.
Average Monthly Rainfall in April
Over the course of April in Stilwell, 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, 2 minutes, implying an average daily increase of 2 minutes, 8 seconds, and weekly increase of 14 minutes, 55 seconds.
The shortest day of the month is April 1, with 12 hours, 36 minutes of daylight and the longest day is April 30, with 13 hours, 37 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Stilwell is 7:04 AM on April 1 and the earliest sunrise is 38 minutes earlier at 6:27 AM on April 30.
The earliest sunset is 7:40 PM on April 1 and the latest sunset is 24 minutes later at 8:04 PM on April 30.
Daylight saving time is observed in Stilwell 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 6:02 AM and sets 14 hours, 35 minutes later, at 8:38 PM, while on December 21, the shortest day of the year, it rises at 7:24 AM and sets 9 hours, 44 minutes later, at 5:08 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in Stilwell is increasing during April, rising from 0% to 6% over the course of the month.
For reference, on July 15, the muggiest day of the year, there are muggy conditions 79% of the time, while on December 13, 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 Stilwell is gradually decreasing during April, decreasing from 7.8 miles per hour to 6.9 miles per hour over the course of the month.
For reference, on March 19, the windiest day of the year, the daily average wind speed is 7.8 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.
Average Wind Speed in April
Wind Direction in April
The growing season in Stilwell typically lasts for 6.9 months (211 days), from around April 3 to around October 31, rarely starting before March 11 or after April 23, and rarely ending before October 13 or after November 20.
During April in Stilwell, the chance that a given day is within the growing season is very rapidly increasing rising from 45% to 97% 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 Stilwell are increasing during April, increasing by 293°F, from 251°F to 544°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Stilwell is gradually increasing during April, rising by 0.8 kWh, from 5.3 kWh to 6.1 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 Stilwell are 35.815 deg latitude, -94.629 deg longitude, and 1,106 ft elevation.
The topography within 2 miles of Stilwell contains significant variations in elevation, with a maximum elevation change of 614 feet and an average elevation above sea level of 1,145 feet. Within 10 miles contains significant variations in elevation (1,030 feet). Within 50 miles contains very significant variations in elevation (2,067 feet).
The area within 2 miles of Stilwell is covered by cropland (76%) and trees (16%), within 10 miles by trees (57%) and cropland (43%), and within 50 miles by trees (47%) and cropland (45%).
This report illustrates the typical weather in Stilwell 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Stilwell.
For each station, the records are corrected for the elevation difference between that station and Stilwell 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 Stilwell is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Stilwell and a given station.
The stations contributing to this reconstruction are: Tahlequah Municipal Airport (28%, 36 kilometers, west); Smith Field (22%, 44 kilometers, north); Sallisaw Municipal Airport (19%, 45 kilometers, south); Drake Field (19%, 47 kilometers, northeast); and Fort Smith Municipal Airport (13%, 59 kilometers, southeast).
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Time zones for aiports and weather stations are provided by AskGeo.com .