Average Weather in September in Wilson Wyoming, United States
Daily high temperatures decrease by 12°F, from 74°F to 62°F, rarely falling below 48°F or exceeding 82°F.
Daily low temperatures decrease by 8°F, from 41°F to 33°F, rarely falling below 25°F or exceeding 49°F.
For reference, on July 27, the hottest day of the year, temperatures in Wilson typically range from 46°F to 80°F, while on January 27, the coldest day of the year, they range from 7°F to 26°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
The month of September in Wilson experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 28% to 34%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 72% of the time.
For reference, on March 18, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.
Cloud Cover Categories in September
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 Wilson, the chance of a wet day over the course of September is gradually increasing, starting the month at 17% and ending it at 19%.
For reference, the year's highest daily chance of a wet day is 32% on May 30, and its lowest chance is 14% on July 4.
Over the course of September in Wilson, the chance of a day with only rain remains an essentially constant 18% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Wilson is essentially constant, remaining about 1.1 inches throughout, and rarely exceeding 2.5 inches or falling below 0.2 inches.
The highest average 31-day accumulation is 1.2 inches on September 30.
Average Monthly Rainfall in September
Over the course of September in Wilson, 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, 25 minutes, implying an average daily decrease of 2 minutes, 56 seconds, and weekly decrease of 20 minutes, 30 seconds.
The shortest day of the month is September 30, with 11 hours, 46 minutes of daylight and the longest day is September 1, with 13 hours, 11 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Wilson is 6:47 AM on September 1 and the latest sunrise is 32 minutes later at 7:19 AM on September 30.
The latest sunset is 7:58 PM on September 1 and the earliest sunset is 52 minutes earlier at 7:06 PM on September 30.
Daylight saving time is observed in Wilson 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 5:42 AM and sets 15 hours, 26 minutes later, at 9:08 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 57 minutes later, at 4:50 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Wilson is essentially constant during September, remaining around 0% throughout.
Humidity Comfort Levels in September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Wilson is essentially constant during September, remaining within 0.1 miles per hour of 4.9 miles per hour throughout.
For reference, on March 30, the windiest day of the year, the daily average wind speed is 5.6 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.
The highest daily average wind speed during September is 5.0 miles per hour on September 6.
Average Wind Speed in September
Wind Direction in September
The growing season in Wilson typically lasts for 2.7 months (83 days), from around June 14 to around September 5, rarely starting before May 20 or after July 6, and rarely ending before August 17 or after September 23.
During September in Wilson, the chance that a given day is within the growing season is very rapidly decreasing falling from 60% to 3% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Wilson are increasing during September, increasing by 181°F, from 1,149°F to 1,330°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Wilson is rapidly decreasing during September, falling by 1.5 kWh, from 6.2 kWh to 4.7 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 Wilson are 43.501 deg latitude, -110.875 deg longitude, and 6,299 ft elevation.
The topography within 2 miles of Wilson contains large variations in elevation, with a maximum elevation change of 2,313 feet and an average elevation above sea level of 6,503 feet. Within 10 miles contains large variations in elevation (4,964 feet). Within 50 miles also contains extreme variations in elevation (8,753 feet).
The area within 2 miles of Wilson is covered by shrubs (64%) and trees (23%), within 10 miles by shrubs (42%) and trees (40%), and within 50 miles by trees (42%) and shrubs (40%).
This report illustrates the typical weather in Wilson 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 Wilson.
For each station, the records are corrected for the elevation difference between that station and Wilson 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 Wilson is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Wilson and a given station.
The stations contributing to this reconstruction are: Jackson Hole Airport (67%, 16 kilometers, northeast); Driggs, Driggs-Reed Memorial Airport (24%, 32 kilometers, northwest); Afton Municipal Airport (5%, 88 kilometers, south); and Ralph Wenz Field (3.4%, 117 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .