Average Weather in September in Pocahontas Iowa, United States
Daily high temperatures decrease by 10°F, from 79°F to 69°F, rarely falling below 57°F or exceeding 88°F.
Daily low temperatures decrease by 12°F, from 59°F to 48°F, rarely falling below 35°F or exceeding 69°F.
For reference, on July 5, the hottest day of the year, temperatures in Pocahontas typically range from 64°F to 84°F, while on January 20, the coldest day of the year, they range from 12°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 Pocahontas experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 32% throughout the month.
The clearest day of the month is September 14, with clear, mostly clear, or partly cloudy conditions 70% of the time.
For reference, on December 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, 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
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Pocahontas, the chance of a wet day over the course of September is decreasing, starting the month at 33% and ending it at 27%.
For reference, the year's highest daily chance of a wet day is 45% on June 7, and its lowest chance is 8% on January 28.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Pocahontas is decreasing, starting the month at 3.2 inches, when it rarely exceeds 5.5 inches or falls below 1.3 inches, and ending the month at 2.5 inches, when it rarely exceeds 4.3 inches or falls below 0.8 inches.
Average Monthly Rainfall in September
Over the course of September in Pocahontas, 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, 23 minutes, implying an average daily decrease of 2 minutes, 51 seconds, and weekly decrease of 19 minutes, 58 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 Pocahontas is 6:43 AM on September 1 and the latest sunrise is 31 minutes later at 7:14 AM on September 30.
The latest sunset is 7:52 PM on September 1 and the earliest sunset is 51 minutes earlier at 7:01 PM on September 30.
Daylight saving time is observed in Pocahontas 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 5:40 AM and sets 15 hours, 20 minutes later, at 9:00 PM, while on December 21, the shortest day of the year, it rises at 7:45 AM and sets 9 hours, 2 minutes later, at 4:47 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Pocahontas is very rapidly decreasing during September, falling from 26% to 3% over the course of the month.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 47% 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 Pocahontas is increasing during September, increasing from 9.5 miles per hour to 11.0 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 13.4 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 8.4 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Pocahontas typically lasts for 5.5 months (168 days), from around April 23 to around October 8, rarely starting before April 4 or after May 12, and rarely ending before September 20 or after October 28.
The month of September in Pocahontas 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 70% 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 Pocahontas are increasing during September, increasing by 400°F, from 2,502°F to 2,902°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Pocahontas 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 Pocahontas are 42.736 deg latitude, -94.669 deg longitude, and 1,227 ft elevation.
The topography within 2 miles of Pocahontas is essentially flat, with a maximum elevation change of 72 feet and an average elevation above sea level of 1,228 feet. Within 10 miles is essentially flat (171 feet). Within 50 miles contains only modest variations in elevation (663 feet).
The area within 2 miles of Pocahontas is covered by cropland (97%), within 10 miles by cropland (100%), and within 50 miles by cropland (98%).
This report illustrates the typical weather in Pocahontas 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 Pocahontas.
For each station, the records are corrected for the elevation difference between that station and Pocahontas 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 Pocahontas is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Pocahontas and a given station.
The stations contributing to this reconstruction are: Fort Dodge Municipal Airport (27%, 45 kilometers, southeast); Storm Lake Municipal Airport (23%, 49 kilometers, west); Algona Municipal Airport (23%, 50 kilometers, northeast); Spencer Municipal Airport (16%, 64 kilometers, northwest); and Arthur N Neu Airport (12%, 77 kilometers, south).
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 .