Rock Falls, IL Weather & Climate Normals
What a normal year in Rock Falls actually looks like
On the 30-year record NOAA keeps for Rock Falls, IL, the comfort score comes out to 44/100, 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 Rock Falls's weather actually swings
Average temperatures in Rock Falls run from 21°F in Jan up to 74°F in Jul, a 52.2°F seasonal swing, one of the widest gaps in this dataset.
How wet Rock Falls actually gets
Over a typical year, Rock Falls sees about 40.53in of precipitation a year across roughly 97 days with measurable rain or snow, with 31.2in of snow a year.
Rock Falls against the rest of the country
Out of 4876 cities scored here, Rock Falls comes in at 3859; within IL alone it ranks 213 of 330. Population is about 8,614.
Checking the actual forecast
These figures come from DIXON 1W, IL US, the NOAA station 10.3 miles from Rock Falls, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated