Average Weather in September in Perry Iowa, United States
Daily high temperatures decrease by 9°F, from 80°F to 71°F, rarely falling below 59°F or exceeding 90°F.
Daily low temperatures decrease by 11°F, from 59°F to 48°F, rarely falling below 36°F or exceeding 69°F.
For reference, on July 5, the hottest day of the year, temperatures in Perry typically range from 64°F to 85°F, while on January 22, the coldest day of the year, they range from 14°F to 32°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
Kara-Balta, Kyrgyzstan (6,547 miles away); Yangquan, China (6,668 miles); and Kosan, North Korea (6,288 miles) are the far-away foreign places with temperatures most similar to Perry (view comparison).
The month of September in Perry 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 14, with clear, mostly clear, or partly cloudy conditions 71% of the time.
For reference, on December 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Perry, the chance of a wet day over the course of September is decreasing, starting the month at 31% and ending it at 25%.
For reference, the year's highest daily chance of a wet day is 44% on June 7, and its lowest chance is 8% on January 9.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Perry is decreasing, starting the month at 3.3 inches, when it rarely exceeds 6.2 inches or falls below 1.3 inches, and ending the month at 2.5 inches, when it rarely exceeds 4.5 inches or falls below 0.9 inches.
Average Monthly Rainfall in September
Over the course of September in Perry, 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, 20 minutes, implying an average daily decrease of 2 minutes, 46 seconds, and weekly decrease of 19 minutes, 20 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, 7 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Perry is 6:42 AM on September 1 and the latest sunrise is 30 minutes later at 7:12 AM on September 30.
The latest sunset is 7:49 PM on September 1 and the earliest sunset is 50 minutes earlier at 6:59 PM on September 30.
Daylight saving time is observed in Perry 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 5:41 AM and sets 15 hours, 13 minutes later, at 8:54 PM, while on December 21, the shortest day of the year, it rises at 7:40 AM and sets 9 hours, 8 minutes later, at 4:48 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Perry is very rapidly decreasing during September, falling from 34% to 4% over the course of the month.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 58% 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
The average hourly wind speed in Perry is increasing during September, increasing from 9.0 miles per hour to 10.6 miles per hour over the course of the month.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 13.0 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Perry typically lasts for 5.8 months (176 days), from around April 19 to around October 13, rarely starting before March 31 or after May 9, and rarely ending before September 23 or after November 1.
The month of September in Perry 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 79% 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 Perry are increasing during September, increasing by 428°F, from 2,632°F to 3,060°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Perry is decreasing during September, falling by 1.2 kWh, from 5.7 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 Perry are 41.839 deg latitude, -94.107 deg longitude, and 974 ft elevation.
The topography within 2 miles of Perry contains only modest variations in elevation, with a maximum elevation change of 105 feet and an average elevation above sea level of 962 feet. Within 10 miles also contains only modest variations in elevation (246 feet). Within 50 miles contains only modest variations in elevation (810 feet).
The area within 2 miles of Perry is covered by cropland (80%) and artificial surfaces (19%), within 10 miles by cropland (98%), and within 50 miles by cropland (92%).
This report illustrates the typical weather in Perry 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 Perry.
For each station, the records are corrected for the elevation difference between that station and Perry 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 Perry is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Perry and a given station.
The stations contributing to this reconstruction are: Perry Municipal Airport (90%, 4.5 kilometers, west); Boone Municipal Airport (4.9%, 32 kilometers, northeast); Ankeny Regional Airport (2.7%, 48 kilometers, east); and Des Moines International Airport (2.5%, 51 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .