Really in NH that is odd for May?
Huh, I've seen it snow in Colorado in July, not up in the mtns, but down in the city (Ft. Collins.)
One time in May it was snowing so hard I literally almost didn't make it to a final exam. Almost wrecked on way there couple times, slipped on sidewalk... Snowflakes were size of cookies. It's always really heavy wet snow on the front range in May, nasty.