Janesville, WI Weather & Climate Normals
What a normal year in Janesville actually looks like
On the 30-year record NOAA keeps for Janesville, WI, the comfort score comes out to 43/100, 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 Janesville's weather actually swings
Average temperatures in Janesville run from 20°F in Jan up to 73°F in Jul, a 52.6°F seasonal swing, one of the widest gaps in this dataset.
How wet Janesville actually gets
Over a typical year, Janesville sees about 37.43in of precipitation a year across roughly 127 days with measurable rain or snow, with 36.6in of snow a year.
Janesville against the rest of the country
Out of 4876 cities scored here, Janesville comes in at 3959; within WI alone it ranks 71 of 157. Population is about 66,428.
Checking the actual forecast
These figures come from AFTON - JANESVILLE WWTP, WI US, the NOAA station 4.2 miles from Janesville, 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