Snow. A little unusual for May but not unheard of. Hard on the trees that are budding, blossoming, etc.
I'm out there with two cameras. ;) My point and shoot (S3) for depth of field (sharp thru out) without a tripod (below). My DSLR (XSi) for the nicer artsy shallow depth of field closeups (above). It was early morning so low light. But I do that a lot, take both cameras for that reason.