Average Weather in September in Arkoma Oklahoma, United States
Daily high temperatures decrease by 10°F, from 90°F to 80°F, rarely falling below 70°F or exceeding 98°F.
Daily low temperatures decrease by 11°F, from 69°F to 58°F, rarely falling below 47°F or exceeding 75°F.
For reference, on July 26, the hottest day of the year, temperatures in Arkoma typically range from 73°F to 94°F, while on January 7, the coldest day of the year, they range from 31°F to 50°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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 September
’Aïn el Bell, Algeria (5,278 miles away); Kafr Takhārīm, Syria (6,585 miles); and Shahrisabz, Uzbekistan (7,166 miles) are the far-away foreign places with temperatures most similar to Arkoma (view comparison).
The month of September in Arkoma 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 September 30, with clear, mostly clear, or partly cloudy conditions 70% of the time.
For reference, on February 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on October 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Arkoma, the chance of a wet day over the course of September is essentially constant, remaining around 28% throughout.
For reference, the year's highest daily chance of a wet day is 44% on May 21, and its lowest chance is 17% on January 19.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Arkoma is increasing, starting the month at 3.2 inches, when it rarely exceeds 5.9 inches or falls below 1.0 inches, and ending the month at 3.9 inches, when it rarely exceeds 7.0 inches or falls below 1.1 inches.
Average Monthly Rainfall in September
Over the course of September in Arkoma, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 3 minutes, implying an average daily decrease of 2 minutes, 11 seconds, and weekly decrease of 15 minutes, 18 seconds.
The shortest day of the month is September 30, with 11 hours, 51 minutes of daylight and the longest day is September 1, with 12 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Arkoma is 6:50 AM on September 1 and the latest sunrise is 22 minutes later at 7:11 AM on September 30.
The latest sunset is 7:44 PM on September 1 and the earliest sunset is 42 minutes earlier at 7:02 PM on September 30.
Daylight saving time is observed in Arkoma during 2018, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:03 AM and sets 14 hours, 33 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:22 AM and sets 9 hours, 46 minutes later, at 5:08 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Arkoma is very rapidly decreasing during September, falling from 66% to 21% over the course of the month.
For reference, on July 22, the muggiest day of the year, there are muggy conditions 86% of the time, while on January 12, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Arkoma is gradually increasing during September, increasing from 5.2 miles per hour to 5.9 miles per hour over the course of the month.
For reference, on March 23, 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 4.7 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Arkoma typically lasts for 7.5 months (230 days), from around March 24 to around November 9, rarely starting before March 2 or after April 15, and rarely ending before October 21 or after November 30.
The month of September in Arkoma is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Arkoma are rapidly increasing during September, increasing by 666°F, from 3,960°F to 4,626°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Arkoma is gradually decreasing during September, falling by 0.9 kWh, from 5.9 kWh to 4.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Arkoma are 35.355 deg latitude, -94.434 deg longitude, and 427 ft elevation.
The topography within 2 miles of Arkoma contains only modest variations in elevation, with a maximum elevation change of 299 feet and an average elevation above sea level of 454 feet. Within 10 miles contains only modest variations in elevation (656 feet). Within 50 miles contains significant variations in elevation (2,428 feet).
The area within 2 miles of Arkoma is covered by artificial surfaces (66%) and cropland (33%), within 10 miles by cropland (53%) and artificial surfaces (25%), and within 50 miles by trees (58%) and cropland (37%).
This report illustrates the typical weather in Arkoma 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Arkoma.
For each station, the records are corrected for the elevation difference between that station and Arkoma 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 Arkoma is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Arkoma and a given station.
The stations contributing to this reconstruction are: Fort Smith Municipal Airport (85%, 7 kilometers, east); Sallisaw Municipal Airport (7%, 35 kilometers, west); Robert S Kerr Airport (6%, 41 kilometers, southwest); and Drake Field (2.1%, 77 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .