Prospect Heights, IL Weather & Climate Normals
Prospect Heights's real weather, in one number
Prospect Heights, IL scores 48/100 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.
Prospect Heights's hottest and coldest months
Prospect Heights's hottest month is Jul, averaging 75°F; its coldest is Jan, averaging 25°F, a 49.7°F swing across the year, one of the widest gaps in this dataset.
Rain and snow in Prospect Heights
Over a typical year, Prospect Heights sees about 32.28in of precipitation a year across roughly 112 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Prospect Heights ranks
Prospect Heights ranks 2387 of 4876 US cities in this dataset for comfort score, and 52 of 330 within IL. About 15,566 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from CHICAGO PALWAUKEE AP, IL US, 1.7 miles from Prospect Heights, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · How the comfort score is calculated