Waterloo, IA Weather & Climate Normals
What a normal year in Waterloo actually looks like
On the 30-year record NOAA keeps for Waterloo, 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 Waterloo's weather actually swings
Average temperatures in Waterloo run from 17°F in Jan up to 73°F in Jul, a 55.3°F seasonal swing, one of the widest gaps in this dataset.
How wet Waterloo actually gets
Over a typical year, Waterloo sees about 36.82in of precipitation a year across roughly 98 days with measurable rain or snow, with 32.3in of snow a year.
Waterloo against the rest of the country
Out of 4876 cities scored here, Waterloo comes in at 3958; within IA alone it ranks 29 of 85. Population is about 67,477.
Checking the actual forecast
These figures come from GRUNDY CTR, IA US, the NOAA station 22.6 miles from Waterloo, 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