Average Weather in May in De Soto Iowa, United States
Daily high temperatures increase by 9°F, from 69°F to 77°F, rarely falling below 55°F or exceeding 87°F.
Daily low temperatures increase by 10°F, from 48°F to 58°F, rarely falling below 37°F or exceeding 66°F.
For reference, on July 20, the hottest day of the year, temperatures in De Soto typically range from 67°F to 86°F, while on January 21, the coldest day of the year, they range from 16°F to 32°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
The month of May in De Soto experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 45% throughout the month.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 56% of the time.
For reference, on February 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on August 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in May
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 De Soto, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 33% and ending it at 42%.
For reference, the year's highest daily chance of a wet day is 44% on June 8, and its lowest chance is 8% on January 9.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in De Soto is increasing, starting the month at 3.6 inches, when it rarely exceeds 5.9 inches or falls below 1.3 inches, and ending the month at 4.3 inches, when it rarely exceeds 7.3 inches or falls below 1.6 inches.
Average Monthly Rainfall in May
Over the course of May in De Soto, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 57 minutes, implying an average daily increase of 1 minute, 54 seconds, and weekly increase of 13 minutes, 16 seconds.
The shortest day of the month is May 1, with 14 hours, 1 minute of daylight and the longest day is May 31, with 14 hours, 58 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in De Soto is 6:12 AM on May 1 and the earliest sunrise is 28 minutes earlier at 5:44 AM on May 31.
The earliest sunset is 8:13 PM on May 1 and the latest sunset is 29 minutes later at 8:42 PM on May 31.
Daylight saving time is observed in De Soto during 2018, but it neither starts nor ends during May, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:42 AM and sets 15 hours, 11 minutes later, at 8:53 PM, while on December 21, the shortest day of the year, it rises at 7:39 AM and sets 9 hours, 10 minutes later, at 4:49 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in De Soto is rapidly increasing during May, rising from 1% to 12% over the course of the month.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 56% 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 May
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in De Soto is decreasing during May, decreasing from 12.0 miles per hour to 10.3 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 12.9 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 May
Wind Direction in May
The growing season in De Soto typically lasts for 6.0 months (184 days), from around April 15 to around October 16, rarely starting before March 29 or after May 2, and rarely ending before September 26 or after November 6.
The month of May in De Soto is more likely than not fully within the growing season, with the chance that a given day is in the growing season increasing from 88% to 100% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in De Soto are increasing during May, increasing by 381°F, from 243°F to 624°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in De Soto is gradually increasing during May, rising by 0.7 kWh, from 5.9 kWh to 6.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of De Soto are 41.532 deg latitude, -94.010 deg longitude, and 974 ft elevation.
The topography within 2 miles of De Soto contains only modest variations in elevation, with a maximum elevation change of 194 feet and an average elevation above sea level of 953 feet. Within 10 miles also contains only modest variations in elevation (335 feet). Within 50 miles contains only modest variations in elevation (794 feet).
The area within 2 miles of De Soto is covered by cropland (93%), within 10 miles by cropland (89%), and within 50 miles by cropland (89%).
This report illustrates the typical weather in De Soto 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 De Soto.
For each station, the records are corrected for the elevation difference between that station and De Soto 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 De Soto is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between De Soto and a given station.
The stations contributing to this reconstruction are: Des Moines International Airport (41%, 30 kilometers, east); Perry Municipal Airport (32%, 35 kilometers, north); Osceola Municipal Airport (14%, 60 kilometers, southeast); and Creston Municipal Airport (12%, 65 kilometers, southwest).
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 .