McHenry, IL Weather & Climate Normals
What a normal year in McHenry actually looks like
On the 30-year record NOAA keeps for McHenry, 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 McHenry's weather actually swings
Average temperatures in McHenry run from 22°F in Jan up to 73°F in Jul, a 51.1°F seasonal swing, one of the widest gaps in this dataset.
How wet McHenry actually gets
Over a typical year, McHenry sees about 36.97in of precipitation a year across roughly 119 days with measurable rain or snow, with 34.5in of snow a year.
McHenry against the rest of the country
Out of 4876 cities scored here, McHenry comes in at 3728; within IL alone it ranks 179 of 330. Population is about 28,825.
Checking the actual forecast
These figures come from MC HENRY -WG STRATTON L&D, IL US, the NOAA station 2.7 miles from McHenry, 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