Average Weather in May in Sac City Iowa, United States
Daily high temperatures increase by 10°F, from 68°F to 78°F, rarely falling below 54°F or exceeding 88°F.
Daily low temperatures increase by 11°F, from 46°F to 57°F, rarely falling below 35°F or exceeding 66°F.
For reference, on July 5, the hottest day of the year, temperatures in Sac City typically range from 65°F to 84°F, while on January 20, the coldest day of the year, they range from 13°F to 29°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
Almaty, Kazakhstan (6,503 miles away); Yinchuan, China (6,698 miles); and Kujang-ŭp, North Korea (6,206 miles) are the far-away foreign places with temperatures most similar to Sac City (view comparison).
The month of May in Sac City experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 48% to 43%.
The clearest day of the month is May 29, with clear, mostly clear, or partly cloudy conditions 57% of the time.
For reference, on February 3, 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 72%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sac City, the chance of a wet day over the course of May is rapidly increasing, starting the month at 33% and ending it at 40%.
For reference, the year's highest daily chance of a wet day is 43% on June 7, and its lowest chance is 8% on January 11.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Sac City is increasing, starting the month at 3.3 inches, when it rarely exceeds 5.7 inches or falls below 1.5 inches, and ending the month at 4.0 inches, when it rarely exceeds 6.9 inches or falls below 1.9 inches.
Average Monthly Rainfall in May
Over the course of May in Sac City, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 59 minutes, implying an average daily increase of 1 minute, 58 seconds, and weekly increase of 13 minutes, 44 seconds.
The shortest day of the month is May 1, with 14 hours, 5 minutes of daylight and the longest day is May 31, with 15 hours, 4 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Sac City is 6:14 AM on May 1 and the earliest sunrise is 29 minutes earlier at 5:46 AM on May 31.
The earliest sunset is 8:19 PM on May 1 and the latest sunset is 30 minutes later at 8:49 PM on May 31.
Daylight saving time is observed in Sac City 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, 18 minutes later, at 9:00 PM, while on December 21, the shortest day of the year, it rises at 7:46 AM and sets 9 hours, 4 minutes later, at 4:50 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Sac City is increasing during May, rising from 1% to 7% over the course of the month.
For reference, on July 22, the muggiest day of the year, there are muggy conditions 51% 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
The average hourly wind speed in Sac City is decreasing during May, decreasing from 12.7 miles per hour to 11.0 miles per hour over the course of the month.
For reference, on April 12, 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 8.5 miles per hour.
Average Wind Speed in May
Wind Direction in May
The growing season in Sac City typically lasts for 5.6 months (171 days), from around April 22 to around October 10, rarely starting before April 3 or after May 13, and rarely ending before September 23 or after October 29.
The month of May in Sac City is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly increasing from 71% 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 Sac City are increasing during May, increasing by 361°F, from 201°F to 562°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Sac City is gradually increasing during May, rising by 0.6 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 Sac City are 42.422 deg latitude, -94.990 deg longitude, and 1,243 ft elevation.
The topography within 2 miles of Sac City contains only modest variations in elevation, with a maximum elevation change of 128 feet and an average elevation above sea level of 1,239 feet. Within 10 miles also contains only modest variations in elevation (312 feet). Within 50 miles contains only modest variations in elevation (636 feet).
The area within 2 miles of Sac City is covered by cropland (91%), within 10 miles by cropland (99%), and within 50 miles by cropland (98%).
This report illustrates the typical weather in Sac City 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 Sac City.
For each station, the records are corrected for the elevation difference between that station and Sac City 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 Sac City is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sac City and a given station.
The stations contributing to this reconstruction are: Storm Lake Municipal Airport (46%, 28 kilometers, northwest); Arthur N Neu Airport (24%, 45 kilometers, south); Denison Municipal Airport (16%, 58 kilometers, southwest); and Fort Dodge Municipal Airport (13%, 68 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .