St. Charles, IL Weather & Climate Normals
What a normal year in St. Charles actually looks like
On the 30-year record NOAA keeps for St. Charles, 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 St. Charles's weather actually swings
Average temperatures in St. Charles run from 23°F in Jan up to 74°F in Jul, a 50.4°F seasonal swing, one of the widest gaps in this dataset.
How wet St. Charles actually gets
St. Charles averages 33.23in of precipitation a year across roughly 121 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
St. Charles against the rest of the country
Out of 4876 cities scored here, St. Charles comes in at 2333; within IL alone it ranks 39 of 330. Population is about 33,482.
Checking the actual forecast
These figures come from WEST CHICAGO DUPAGE AP, IL US, the NOAA station 3.3 miles from St. Charles, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · Why this uses the nearest NOAA station