Vandalia, IL Weather & Climate Normals
What a normal year in Vandalia actually looks like
On the 30-year record NOAA keeps for Vandalia, IL, the comfort score comes out to 54/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 6 months a year land in the 55–75°F range this site treats as mild.
How much Vandalia's weather actually swings
Average temperatures in Vandalia run from 29°F in Jan up to 77°F in Jul, a 47.7°F seasonal swing, one of the widest gaps in this dataset.
How wet Vandalia actually gets
Vandalia averages 41.2in of precipitation a year across roughly 106 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Vandalia against the rest of the country
Out of 4876 cities scored here, Vandalia comes in at 992; within IL alone it ranks 2 of 330. Population is about 7,358.
Checking the actual forecast
These figures come from BROWNSTOWN 4 SW, IL US, the NOAA station 8.3 miles from Vandalia, 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