Average Weather in September in Rosebud South Dakota, United States
Daily high temperatures decrease by 14°F, from 83°F to 70°F, rarely falling below 54°F or exceeding 94°F.
Daily low temperatures decrease by 13°F, from 57°F to 44°F, rarely falling below 33°F or exceeding 67°F.
For reference, on July 19, the hottest day of the year, temperatures in Rosebud typically range from 63°F to 88°F, while on January 2, the coldest day of the year, they range from 13°F to 33°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 Rosebud 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 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 52%, while on July 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
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 Rosebud, the chance of a wet day over the course of September is gradually decreasing, starting the month at 19% and ending it at 16%.
For reference, the year's highest daily chance of a wet day is 36% on June 9, and its lowest chance is 3% on January 11.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Rosebud is essentially constant, remaining about 1.4 inches throughout, and rarely exceeding 3.0 inches or falling below 0.3 inches.
Average Monthly Rainfall in September
Over the course of September in Rosebud, 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, 24 minutes, implying an average daily decrease of 2 minutes, 54 seconds, and weekly decrease of 20 minutes, 18 seconds.
The shortest day of the month is September 30, with 11 hours, 47 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 Rosebud is 7:07 AM on September 1 and the latest sunrise is 32 minutes later at 7:39 AM on September 30.
The latest sunset is 8:18 PM on September 1 and the earliest sunset is 52 minutes earlier at 7:26 PM on September 30.
Daylight saving time is observed in Rosebud during 2019, 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 15 hours, 24 minutes later, at 9:26 PM, while on December 22, the shortest day of the year, it rises at 8:12 AM and sets 8 hours, 59 minutes later, at 5:11 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Rosebud is gradually decreasing during September, falling from 3% to 0% over the course of the month.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 11% of the time, while on January 1, 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 Rosebud is increasing during September, increasing from 10.5 miles per hour to 11.7 miles per hour over the course of the month.
For reference, on April 7, the windiest day of the year, the daily average wind speed is 12.8 miles per hour, while on July 26, the calmest day of the year, the daily average wind speed is 9.6 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Rosebud typically lasts for 4.8 months (148 days), from around May 7 to around October 1, rarely starting before April 19 or after May 24, and rarely ending before September 13 or after October 19.
The month of September in Rosebud 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 99% to 54% 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 Rosebud are increasing during September, increasing by 387°F, from 2,345°F to 2,732°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Rosebud is decreasing during September, falling by 1.4 kWh, from 5.8 kWh to 4.4 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 Rosebud are 43.233 deg latitude, -100.853 deg longitude, and 2,749 ft elevation.
The topography within 2 miles of Rosebud contains only modest variations in elevation, with a maximum elevation change of 417 feet and an average elevation above sea level of 2,727 feet. Within 10 miles contains only modest variations in elevation (810 feet). Within 50 miles contains significant variations in elevation (1,909 feet).
The area within 2 miles of Rosebud is covered by grassland (98%), within 10 miles by grassland (92%), and within 50 miles by grassland (94%).
This report illustrates the typical weather in Rosebud 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 Rosebud.
For each station, the records are corrected for the elevation difference between that station and Rosebud 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 Rosebud is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rosebud and a given station.
The stations contributing to this reconstruction are: Miller Field (48%, 47 kilometers, southeast); Winner Regional Airport (19%, 84 kilometers, east); Philip Municipal Airport (13%, 109 kilometers, northwest); Pierre Municipal Airport (9%, 136 kilometers, north); and Pine Ridge Airport (10%, 137 kilometers, west).
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 .