I don't recommend having snow in May at all, especially after you've already grafted and have mating nucs out and all the rest. This is no good. Don't do it, you wouldn't like it.
Anyway, that's the news. I have reservations to fill and hives to be requeened after that, so there is a bunch of necessity to get these grafts and mating nucs moving and the weather has been extremely uncooperative. I can only hope for a long and moist season or there won't be any honey this year. I will deliver on nucs if at all possible.