It happened about 4 years ago in the middle of April at my house as roofers were working on my roof. 4.5 inches of snow officially for Hagerstown.

Correct and it bears repeating that once in a while it snows in the Hagerstown area in April. Fact.

We might get a little snow. We average .01″ in April since 1970. But all my life we never had any storm like that in April in Central PA. That’s including the 70’s and early 90’s.