Average Weather in September in Redwood Falls Minnesota, United States
Daily high temperatures decrease by 11°F, from 78°F to 68°F, rarely falling below 54°F or exceeding 88°F.
Daily low temperatures decrease by 12°F, from 58°F to 46°F, rarely falling below 34°F or exceeding 67°F.
For reference, on July 18, the hottest day of the year, temperatures in Redwood Falls typically range from 64°F to 84°F, while on January 15, the coldest day of the year, they range from 8°F to 24°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 Redwood Falls experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 30% to 36%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 70% of the time.
For reference, on February 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.
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 Redwood Falls, the chance of a wet day over the course of September is rapidly decreasing, starting the month at 31% and ending it at 23%.
For reference, the year's highest daily chance of a wet day is 40% on June 9, and its lowest chance is 6% on January 30.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Redwood Falls is decreasing, starting the month at 2.8 inches, when it rarely exceeds 5.0 inches or falls below 0.9 inches, and ending the month at 2.2 inches, when it rarely exceeds 4.5 inches or falls below 0.6 inches.
Average Monthly Rainfall in September
Over the course of September in Redwood Falls, 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, 28 minutes, implying an average daily decrease of 3 minutes, 2 seconds, and weekly decrease of 21 minutes, 16 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, 14 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Redwood Falls is 6:43 AM on September 1 and the latest sunrise is 34 minutes later at 7:17 AM on September 30.
The latest sunset is 7:56 PM on September 1 and the earliest sunset is 54 minutes earlier at 7:02 PM on September 30.
Daylight saving time is observed in Redwood Falls 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 5:35 AM and sets 15 hours, 33 minutes later, at 9:09 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 49 minutes later, at 4:43 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Redwood Falls is rapidly decreasing during September, falling from 21% to 2% over the course of the month.
For reference, on July 20, the muggiest day of the year, there are muggy conditions 38% of the time, while on November 15, the least muggy day of the year, there are muggy conditions 0% of the time.
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 Redwood Falls is increasing during September, increasing from 9.8 miles per hour to 11.1 miles per hour over the course of the month.
For reference, on April 9, the windiest day of the year, the daily average wind speed is 13.1 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 8.6 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Redwood Falls typically lasts for 5.4 months (163 days), from around April 24 to around October 4, rarely starting before April 4 or after May 14, and rarely ending before September 16 or after October 23.
The month of September in Redwood Falls is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 61% 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 Redwood Falls are increasing during September, increasing by 365°F, from 2,365°F to 2,731°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Redwood Falls is decreasing during September, falling by 1.4 kWh, from 5.5 kWh to 4.1 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 Redwood Falls are 44.539 deg latitude, -95.117 deg longitude, and 1,020 ft elevation.
The topography within 2 miles of Redwood Falls contains only modest variations in elevation, with a maximum elevation change of 210 feet and an average elevation above sea level of 1,010 feet. Within 10 miles also contains only modest variations in elevation (272 feet). Within 50 miles contains only modest variations in elevation (968 feet).
The area within 2 miles of Redwood Falls is covered by cropland (72%), trees (13%), and artificial surfaces (12%), within 10 miles by cropland (94%), and within 50 miles by cropland (96%).
This report illustrates the typical weather in Redwood Falls 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 Redwood Falls.
For each station, the records are corrected for the elevation difference between that station and Redwood Falls 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 Redwood Falls is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Redwood Falls and a given station.
The stations contributing to this reconstruction are: Redwood Falls Municipal Airport (95%, 3.1 kilometers, east); Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (1.9%, 42 kilometers, northwest); Tracy Municipal Airport (1.4%, 51 kilometers, southwest); Marshall, Southwest Minnesota Regional Airport - Marshall/Ryan Field (1.2%, 56 kilometers, west); and Windom Municipal Airport (0.9%, 70 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .