Jacksonville, IL Weather & Climate Normals
Jacksonville's real weather, in one number
Jacksonville, IL scores 47/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Jacksonville's hottest and coldest months
Jacksonville's hottest month is Jul, averaging 75°F; its coldest is Jan, averaging 27°F, a 48.2°F swing across the year, one of the widest gaps in this dataset.
Rain and snow in Jacksonville
Jacksonville averages 39.25in of precipitation a year across roughly 115 days with measurable rain or snow, and 16.2in of snow a year.
Where Jacksonville ranks
Jacksonville ranks 2670 of 4876 US cities in this dataset for comfort score, and 84 of 330 within IL. About 17,801 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from JACKSONVILLE 2E, IL US, 1.9 miles from Jacksonville, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station