So how unusual was this snow-storm on May 10th, 1990 in Milwaukee?
The short answer is once in a lifetime, or maybe twice? The record book going back to the late 1800s shows this date as well as May 3, 1935 as getting 3.2” of snow in Milwaukee (of course most of the damage on May 10thhappened where amounts where 6”-8”). No other date in May has ever seen 2” or more. In fact we’ve never seen more than a trace of snow after May 11th.
Let's hope it's at least another 100 years before this happens again!