Our weather is like a woman, highly unpredictable at their best.
I've seen mild winters followed by a "spring" that seems like a winter that will never end. This was May 17th 2013.
In a typical spring the trees would have already had their leaves for a week and we'd have highs in the 50's to low 60's, not 4" of fresh snow.
Expect every weather possibility and make the best of it.