Mount Prospect, IL Weather & Climate Normals
What a normal year in Mount Prospect actually looks like
On the 30-year record NOAA keeps for Mount Prospect, IL, the comfort score comes out to 48/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Mount Prospect's weather actually swings
Average temperatures in Mount Prospect run from 25°F in Jan up to 75°F in Jul, a 49.7°F seasonal swing, one of the widest gaps in this dataset.
How wet Mount Prospect actually gets
Mount Prospect averages 32.28in of precipitation a year across roughly 112 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Mount Prospect against the rest of the country
Out of 4876 cities scored here, Mount Prospect comes in at 2311; within IL alone it ranks 32 of 330. Population is about 55,460.
Checking the actual forecast
These figures come from CHICAGO PALWAUKEE AP, IL US, the NOAA station 4.3 miles from Mount Prospect, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is