Zion, IL Weather & Climate Normals
What a normal year in Zion actually looks like
On the 30-year record NOAA keeps for Zion, IL, the comfort score comes out to 49/100, 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 Zion's weather actually swings
Average temperatures in Zion run from 24°F in Jan up to 72°F in Jul, a 48.1°F seasonal swing, one of the widest gaps in this dataset.
How wet Zion actually gets
Zion averages 35.3in of precipitation a year across roughly 129 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Zion against the rest of the country
Out of 4876 cities scored here, Zion comes in at 2110; within IL alone it ranks 14 of 330. Population is about 24,583.
Checking the actual forecast
These figures come from CHICAGO WAUKEGAN RGNL AP, IL US, the NOAA station 3.1 miles from Zion, 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