Oswego, IL Weather & Climate Normals
What a normal year in Oswego actually looks like
On the 30-year record NOAA keeps for Oswego, 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 Oswego's weather actually swings
Average temperatures in Oswego run from 23°F in Jan up to 74°F in Jul, a 51.1°F seasonal swing, one of the widest gaps in this dataset.
How wet Oswego actually gets
Over a typical year, Oswego sees about 39.47in of precipitation a year across roughly 116 days with measurable rain or snow, with 27.9in of snow a year.
Oswego against the rest of the country
Out of 4876 cities scored here, Oswego comes in at 3706; within IL alone it ranks 171 of 330. Population is about 38,778.
Checking the actual forecast
These figures come from AURORA, IL US, the NOAA station 6.9 miles from Oswego, 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