Average Weather in September in Primghar Iowa, United States
Daily high temperatures decrease by 10°F, from 78°F to 69°F, rarely falling below 56°F or exceeding 88°F.
Daily low temperatures decrease by 12°F, from 58°F to 46°F, rarely falling below 33°F or exceeding 68°F.
For reference, on July 5, the hottest day of the year, temperatures in Primghar typically range from 63°F to 84°F, while on January 19, the coldest day of the year, they range from 11°F to 28°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 Primghar experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 30% to 35%.
The clearest day of the month is September 13, with clear, mostly clear, or partly cloudy conditions 70% of the time.
For reference, on February 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
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 Primghar, the chance of a wet day over the course of September is decreasing, starting the month at 31% and ending it at 27%.
For reference, the year's highest daily chance of a wet day is 42% on June 7, and its lowest chance is 7% on January 30.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Primghar is decreasing, starting the month at 3.1 inches, when it rarely exceeds 5.6 inches or falls below 1.2 inches, and ending the month at 2.5 inches, when it rarely exceeds 4.7 inches or falls below 0.7 inches.
Average Monthly Rainfall in September
Over the course of September in Primghar, 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, 53 seconds, and weekly decrease of 20 minutes, 12 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, 10 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Primghar is 6:46 AM on September 1 and the latest sunrise is 32 minutes later at 7:18 AM on September 30.
The latest sunset is 7:57 PM on September 1 and the earliest sunset is 52 minutes earlier at 7:05 PM on September 30.
Daylight saving time is observed in Primghar 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 5:43 AM and sets 15 hours, 22 minutes later, at 9:05 PM, while on December 21, the shortest day of the year, it rises at 7:50 AM and sets 9 hours, 0 minutes later, at 4:50 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Primghar is very rapidly decreasing during September, falling from 28% to 3% over the course of the month.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 50% 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 Primghar is increasing during September, increasing from 10.0 miles per hour to 11.3 miles per hour over the course of the month.
For reference, on April 8, the windiest day of the year, the daily average wind speed is 13.6 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 8.8 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Primghar typically lasts for 5.1 months (155 days), from around April 29 to around October 1, rarely starting before April 11 or after May 16, and rarely ending before September 13 or after October 20.
The month of September in Primghar 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 52% 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 Primghar are increasing during September, increasing by 378°F, from 2,403°F to 2,781°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Primghar is decreasing during September, falling by 1.3 kWh, from 5.6 kWh to 4.3 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 Primghar are 43.087 deg latitude, -95.627 deg longitude, and 1,483 ft elevation.
The topography within 2 miles of Primghar contains only modest variations in elevation, with a maximum elevation change of 125 feet and an average elevation above sea level of 1,487 feet. Within 10 miles also contains only modest variations in elevation (246 feet). Within 50 miles contains only modest variations in elevation (679 feet).
The area within 2 miles of Primghar is covered by cropland (99%), within 10 miles by cropland (100%), and within 50 miles by cropland (98%).
This report illustrates the typical weather in Primghar 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 Primghar.
For each station, the records are corrected for the elevation difference between that station and Primghar 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 Primghar is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Primghar and a given station.
The stations contributing to this reconstruction are: Sheldon (44%, 21 kilometers, northwest); Spencer Municipal Airport (20%, 36 kilometers, east); Orange City Municipal Airport (19%, 37 kilometers, west); and Cherokee Municipal Airport (17%, 40 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .