Average Weather in July in Grandview Illinois, United States
Daily high temperatures are around 86°F, rarely falling below 78°F or exceeding 93°F. The highest daily average high temperature is 86°F on July 20.
Daily low temperatures are around 67°F, rarely falling below 58°F or exceeding 75°F. The highest daily average low temperature is 68°F on July 21.
For reference, on July 19, the hottest day of the year, temperatures in Grandview typically range from 68°F to 86°F, while on January 22, the coldest day of the year, they range from 21°F to 35°F.
Average High and Low Temperature in July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July
The month of July in Grandview experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 38% to 32%.
The clearest day of the month is July 29, with clear, mostly clear, or partly cloudy conditions 68% of the time.
For reference, on February 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on August 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in July
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 Grandview, the chance of a wet day over the course of July is essentially constant, remaining around 33% throughout.
For reference, the year's highest daily chance of a wet day is 39% on June 8, and its lowest chance is 15% on January 28.
Probability of Precipitation in July
The average sliding 31-day rainfall during July in Grandview is gradually decreasing, starting the month at 3.5 inches, when it rarely exceeds 6.5 inches or falls below 1.3 inches, and ending the month at 3.0 inches, when it rarely exceeds 5.3 inches or falls below 1.3 inches.
Average Monthly Rainfall in July
Over the course of July in Grandview, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 40 minutes, implying an average daily decrease of 1 minute, 21 seconds, and weekly decrease of 9 minutes, 25 seconds.
The shortest day of the month is July 31, with 14 hours, 16 minutes of daylight and the longest day is July 1, with 14 hours, 57 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in Grandview is 5:33 AM on July 1 and the latest sunrise is 22 minutes later at 5:56 AM on July 31.
The latest sunset is 8:30 PM on July 1 and the earliest sunset is 18 minutes earlier at 8:12 PM on July 31.
Daylight saving time is observed in Grandview during 2018, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:30 AM and sets 15 hours, 0 minutes later, at 8:30 PM, while on December 21, the shortest day of the year, it rises at 7:16 AM and sets 9 hours, 21 minutes later, at 4:37 PM.
Sunrise & Sunset with Twilight in July
The chance that a given day will be muggy in Grandview is increasing during July, rising from 55% to 61% over the course of the month.
The highest chance of a muggy day during July is 64% on July 21.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 64% 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 July
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Grandview is gradually decreasing during July, decreasing from 7.9 miles per hour to 7.1 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 12.4 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 7.1 miles per hour.
The lowest daily average wind speed during July is 7.1 miles per hour on July 31.
Average Wind Speed in July
Wind Direction in July
The growing season in Grandview typically lasts for 6.3 months (193 days), from around April 11 to around October 21, rarely starting before March 26 or after April 28, and rarely ending before October 3 or after November 9.
The month of July in Grandview is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
The average accumulated growing degree days in Grandview are rapidly increasing during July, increasing by 772°F, from 1,456°F to 2,228°F, over the course of the month.
Growing Degree Days in July
The average daily incident shortwave solar energy in Grandview is essentially constant during July, remaining within 0.1 kWh of 6.7 kWh throughout.
The highest average daily incident shortwave solar energy during July is 6.9 kWh on July 2.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Grandview are 39.816 deg latitude, -89.619 deg longitude, and 581 ft elevation.
The topography within 2 miles of Grandview is essentially flat, with a maximum elevation change of 72 feet and an average elevation above sea level of 588 feet. Within 10 miles is essentially flat (157 feet). Within 50 miles also contains only modest variations in elevation (390 feet).
The area within 2 miles of Grandview is covered by artificial surfaces (84%) and cropland (15%), within 10 miles by cropland (63%) and artificial surfaces (18%), and within 50 miles by cropland (89%).
This report illustrates the typical weather in Grandview 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 Grandview.
For each station, the records are corrected for the elevation difference between that station and Grandview 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 Grandview is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Grandview and a given station.
The stations contributing to this reconstruction are: Abraham Lincoln Capital Airport (87%, 6 kilometers, northwest); Taylorville Municipal Airport (6%, 40 kilometers, southeast); Logan County Airport (4.7%, 45 kilometers, northeast); and Decatur Airport (2.7%, 64 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .