https://pilotworkshop.com/tips/flying-through-snow/?

Perhaps the biggest threat from snow is when the aircraft is still on the surface. Pulling your plane out of a relatively warm hangar into a snowfall will cause it to accumulate on the surfaces of the aircraft quite quickly and contaminate the wing. Never attempt to depart with a contaminated wing. Snow stuck to the airframe will not simply blow off on your takeoff roll as you might expect, leaving the airplane severely handicapped for flight.”