Grinnell, IA Weather & Climate Normals
What a normal year in Grinnell actually looks like
On the 30-year record NOAA keeps for Grinnell, IA, 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 Grinnell's weather actually swings
Average temperatures in Grinnell run from 19°F in Jan up to 73°F in Jul, a 53.3°F seasonal swing, one of the widest gaps in this dataset.
How wet Grinnell actually gets
Over a typical year, Grinnell sees about 38.19in of precipitation a year across roughly 115 days with measurable rain or snow, with 31in of snow a year.
Grinnell against the rest of the country
Out of 4876 cities scored here, Grinnell comes in at 4074; within IA alone it ranks 37 of 85. Population is about 9,495.
Checking the actual forecast
These figures come from GRINNELL 3 SW, IA US, the NOAA station 1.6 miles from Grinnell, 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