The bees in the snow are probably ones who died in the hive that undertakers were finally able to remove on a flight day. The warmth of the sun makes them melt into the snow, quite normal. You can peek under the lid anytime you want, but better to put your ear on the side of the hive and tap with a knuckle; you'll hear the buzz increase for reassurance. If you want to open the lid to see where the cluster is or how big it is, wait for a 50+ degree day. At any rate don't disturb the cluster by removing frames unless it's a good flight day.
It's tempting to open up to be reassured, but it helps your state of mind not the bees. If you think they're light on stores, put newspaper on the top bars with some dry sugar on that for emergency feed. Search on "Mountaincamp method" for more info on this technique, or just feed syrup/fondant/what have you for peace of mind.
Bees, brews and fun
in Lyons, CO