Average Weather in August in Siloam Springs Arkansas, United States
Daily high temperatures decrease by 3°F, from 90°F to 87°F, rarely falling below 78°F or exceeding 98°F.
Daily low temperatures decrease by 4°F, from 69°F to 65°F, rarely falling below 58°F or exceeding 75°F.
For reference, on July 25, the hottest day of the year, temperatures in Siloam Springs typically range from 70°F to 90°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 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 Siloam Springs experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 30% throughout the month.
The clearest day of the month is August 2, with clear, mostly clear, or partly cloudy conditions 71% of the time.
For reference, on February 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, 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
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Siloam Springs, the chance of a wet day over the course of August is essentially constant, remaining around 28% throughout.
For reference, the year's highest daily chance of a wet day is 43% on May 21, and its lowest chance is 14% on January 13.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Siloam Springs 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 3.4 inches, when it rarely exceeds 6.0 inches or falls below 1.1 inches.
Average Monthly Rainfall in August
Over the course of August in Siloam Springs, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 60 minutes, implying an average daily decrease of 1 minute, 60 seconds, and weekly decrease of 13 minutes, 58 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 Siloam Springs is 6:25 AM on August 1 and the latest sunrise is 24 minutes later at 6:48 AM on August 31.
The latest sunset is 8:23 PM on August 1 and the earliest sunset is 36 minutes earlier at 7:47 PM on August 31.
Daylight saving time is observed in Siloam Springs 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 6:01 AM and sets 14 hours, 38 minutes later, at 8:38 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 9 hours, 42 minutes later, at 5:07 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Siloam Springs is very rapidly decreasing during August, falling from 61% to 38% over the course of the month.
For reference, on July 17, the muggiest day of the year, there are muggy conditions 66% of the time, while on November 20, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in August
The average hourly wind speed in Siloam Springs is essentially constant during August, remaining within 0.2 miles per hour of 5.0 miles per hour throughout.
For reference, on March 12, the windiest day of the year, the daily average wind speed is 8.0 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.
The lowest daily average wind speed during August is 4.7 miles per hour on August 4.
Average Wind Speed in August
Wind Direction in August
The growing season in Siloam Springs typically lasts for 6.7 months (205 days), from around April 6 to around October 29, rarely starting before March 17 or after April 25, and rarely ending before October 11 or after November 16.
The month of August in Siloam Springs 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 Siloam Springs are rapidly increasing during August, increasing by 797°F, from 2,626°F to 3,424°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Siloam Springs 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 Siloam Springs are 36.188 deg latitude, -94.540 deg longitude, and 1,135 ft elevation.
The topography within 2 miles of Siloam Springs contains only modest variations in elevation, with a maximum elevation change of 177 feet and an average elevation above sea level of 1,133 feet. Within 10 miles contains only modest variations in elevation (600 feet). Within 50 miles contains significant variations in elevation (2,034 feet).
The area within 2 miles of Siloam Springs is covered by cropland (59%) and artificial surfaces (38%), within 10 miles by cropland (62%) and trees (36%), and within 50 miles by trees (52%) and cropland (43%).
This report illustrates the typical weather in Siloam Springs 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 Siloam Springs.
For each station, the records are corrected for the elevation difference between that station and Siloam Springs 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 Siloam Springs is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Siloam Springs and a given station.
The stations contributing to this reconstruction are: Smith Field (95%, 4.5 kilometers, east); Grove Municipal Airport (2.7%, 50 kilometers, north); and Tahlequah Municipal Airport (2.7%, 51 kilometers, southwest).
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 .