Average Weather in August in Johnson Arkansas, United States
Daily high temperatures decrease by 3°F, from 90°F to 87°F, rarely falling below 78°F or exceeding 97°F.
Daily low temperatures decrease by 4°F, from 70°F to 67°F, rarely falling below 58°F or exceeding 76°F.
For reference, on July 25, the hottest day of the year, temperatures in Johnson typically range from 71°F to 90°F, while on January 22, the coldest day of the year, they range from 29°F to 47°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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 August
The month of August in Johnson experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 31% throughout the month.
The clearest day of the month is August 2, with clear, mostly clear, or partly cloudy conditions 70% of the time.
For reference, on February 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 50%, while on July 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in August
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 Johnson, the chance of a wet day over the course of August is essentially constant, remaining around 29% throughout.
For reference, the year's highest daily chance of a wet day is 44% on May 27, and its lowest chance is 15% on January 13.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Johnson is increasing, starting the month at 2.8 inches, when it rarely exceeds 5.1 inches or falls below 0.9 inches, and ending the month at 3.3 inches, when it rarely exceeds 6.1 inches or falls below 1.1 inches.
Average Monthly Rainfall in August
Over the course of August in Johnson, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 0 minutes, implying an average daily decrease of 2 minutes, 0 seconds, and weekly decrease of 13 minutes, 57 seconds.
The shortest day of the month is August 31, with 12 hours, 58 minutes of daylight and the longest day is August 1, with 13 hours, 58 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Johnson is 6:23 AM on August 1 and the latest sunrise is 24 minutes later at 6:47 AM on August 31.
The latest sunset is 8:21 PM on August 1 and the earliest sunset is 36 minutes earlier at 7:45 PM on August 31.
Daylight saving time is observed in Johnson during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:59 AM and sets 14 hours, 37 minutes later, at 8:37 PM, while on December 21, the shortest day of the year, it rises at 7:23 AM and sets 9 hours, 42 minutes later, at 5:05 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Johnson is very rapidly decreasing during August, falling from 70% to 47% over the course of the month.
For reference, on July 23, the muggiest day of the year, there are muggy conditions 74% of the time, while on January 11, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in August
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Johnson is essentially constant during August, remaining within 0.2 miles per hour of 4.4 miles per hour throughout.
For reference, on March 10, the windiest day of the year, the daily average wind speed is 7.3 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.2 miles per hour.
The lowest daily average wind speed during August is 4.2 miles per hour on August 4.
Average Wind Speed in August
Wind Direction in August
The growing season in Johnson typically lasts for 7.2 months (218 days), from around March 31 to around November 5, rarely starting before March 10 or after April 19, and rarely ending before October 16 or after November 27.
The month of August in Johnson is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
The average accumulated growing degree days in Johnson are rapidly increasing during August, increasing by 828°F, from 2,698°F to 3,526°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Johnson is gradually decreasing during August, falling by 0.8 kWh, from 6.7 kWh to 5.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Johnson are 36.133 deg latitude, -94.165 deg longitude, and 1,273 ft elevation.
The topography within 2 miles of Johnson contains only modest variations in elevation, with a maximum elevation change of 240 feet and an average elevation above sea level of 1,250 feet. Within 10 miles contains only modest variations in elevation (869 feet). Within 50 miles contains very significant variations in elevation (2,221 feet).
The area within 2 miles of Johnson is covered by artificial surfaces (54%) and cropland (40%), within 10 miles by cropland (58%) and trees (23%), and within 50 miles by trees (60%) and cropland (37%).
This report illustrates the typical weather in Johnson 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 Johnson.
For each station, the records are corrected for the elevation difference between that station and Johnson 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 Johnson is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Johnson and a given station.
The stations contributing to this reconstruction are: Springdale Municipal Airport (68%, 5.8 kilometers, northeast); Drake Field (21%, 14 kilometers, south); and Northwest Arkansas Regional Airport (11%, 21 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .