Average Weather in October in Greenfield Iowa, United States
Daily high temperatures decrease by 14°F, from 70°F to 56°F, rarely falling below 40°F or exceeding 82°F.
Daily low temperatures decrease by 11°F, from 48°F to 37°F, rarely falling below 25°F or exceeding 60°F.
For reference, on July 20, the hottest day of the year, temperatures in Greenfield typically range from 66°F to 85°F, while on January 20, the coldest day of the year, they range from 16°F to 32°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
Çalxanqala, Azerbaijan (6,318 miles away); Yangquan, China (6,696 miles); and Koksan, North Korea (6,335 miles) are the far-away foreign places with temperatures most similar to Greenfield (view comparison).
The month of October in Greenfield experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 33% to 43%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on February 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on August 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in October
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Greenfield, the chance of a wet day over the course of October is rapidly decreasing, starting the month at 26% and ending it at 18%.
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 12.
Probability of Precipitation in October
The average sliding 31-day rainfall during October in Greenfield is decreasing, starting the month at 2.6 inches, when it rarely exceeds 4.8 inches or falls below 0.8 inches, and ending the month at 1.8 inches, when it rarely exceeds 3.5 inches or falls below 0.5 inches.
Average Monthly Rainfall in October
Over the course of October in Greenfield, 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, 19 minutes, implying an average daily decrease of 2 minutes, 38 seconds, and weekly decrease of 18 minutes, 24 seconds.
The shortest day of the month is October 31, with 10 hours, 26 minutes of daylight and the longest day is October 1, with 11 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Greenfield is 7:14 AM on October 1 and the latest sunrise is 34 minutes later at 7:48 AM on October 31.
The latest sunset is 6:59 PM on October 1 and the earliest sunset is 45 minutes earlier at 6:14 PM on October 31.
Daylight saving time is observed in Greenfield during 2018, but it neither starts nor ends during October, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:44 AM and sets 15 hours, 10 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, 11 minutes later, at 4:51 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
The chance that a given day will be muggy in Greenfield is gradually decreasing during October, falling from 4% to 0% over the course of the month.
For reference, on July 22, the muggiest day of the year, there are muggy conditions 57% 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 October
The average hourly wind speed in Greenfield is gradually increasing during October, increasing from 10.7 miles per hour to 11.4 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 8.2 miles per hour.
Average Wind Speed in October
Wind Direction in October
The growing season in Greenfield typically lasts for 5.8 months (176 days), from around April 18 to around October 11, rarely starting before April 1 or after May 5, and rarely ending before September 22 or after October 31.
During October in Greenfield, the chance that a given day is within the growing season is very rapidly decreasing falling from 74% to 10% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October
The average accumulated growing degree days in Greenfield are gradually increasing during October, increasing by 178°F, from 3,064°F to 3,242°F, over the course of the month.
Growing Degree Days in October
The average daily incident shortwave solar energy in Greenfield is decreasing during October, falling by 1.5 kWh, from 4.4 kWh to 3.0 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Greenfield are 41.305 deg latitude, -94.461 deg longitude, and 1,319 ft elevation.
The topography within 2 miles of Greenfield contains only modest variations in elevation, with a maximum elevation change of 171 feet and an average elevation above sea level of 1,323 feet. Within 10 miles also contains only modest variations in elevation (364 feet). Within 50 miles contains only modest variations in elevation (784 feet).
The area within 2 miles of Greenfield is covered by cropland (91%), within 10 miles by cropland (95%), and within 50 miles by cropland (92%).
This report illustrates the typical weather in Greenfield 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 Greenfield.
For each station, the records are corrected for the elevation difference between that station and Greenfield 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 Greenfield is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Greenfield and a given station.
The stations contributing to this reconstruction are: Creston Municipal Airport (37%, 34 kilometers, south); Atlantic Municipal Airport (21%, 50 kilometers, west); Audubon County Airport (17%, 58 kilometers, northwest); Perry Municipal Airport (14%, 63 kilometers, northeast); and Des Moines International Airport (12%, 72 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .