Snow in the summer months? Has it ever happened in Iowa? NOPE. Not even close. Not just in July, but there has never been documented snow in June, July, or August anywhere in Iowa.
In Waterloo, it has NEVER been colder than 42* in July. (7/7/1984) Since 1950, Waterloo has only experienced 25 days in July with temperatures in the 40s...
It's rare for Iowans to be blasted by a Winter Storm in the month of May.
The most snow to fall in a single day in Waterloo in the month of May is 2" in 1945 and 1947. The most recent time it has snowed in May in Waterloo was a trace in 2005...