Scotto,
Anytime you're flying in wet snow around freezing, as Paco says, you either want to be keeping a close eye on things, or having said coffee. That said, we do a LOT of work in these conditions on the West Coast, you just have to monitor them closely, and bear in mind an Astar will be different to a 500 or 206 etc etc. Know your flight manual and you'll be fine a far as an type specific issues/limitations.
Flying in colder, falling snow, is actually preferable to rain for me in many instances. A) It doesn't stick to the window or distort your vision as rain does, and B) you usually don't have fogging issues on the inside of the wind screen. However, and this is a really big however, in very low vis operations as Malabo is talking about, you have to be very careful about flying over open, or completely snow covered areas. This can lead to "whiteout" situations, that in a VFR ship, can and will lead to a nasty accident.
There are a few "rules of thumb" I use, but mainly when operating below the treeline, don't attempt to transit an area you cannot see across such as a frozen lake, or even open fields when the vis is right down in the one power pole example. This is a sure way to get disoriented, and leads to a number of accidents every year. Fly the edge of lakes or fields along the tree-line.
The other thing, is to be very aware of the "snowball" on approach and departure in fresh snow. This is the cause of a number of rollovers every season, and there are a few things you can do to mitigate the effects of blowing on liftoff or dept. First, ALWAYS land next to something dark in colour, a rock or bush will work, and be close, even if you land ON the bush. This is often your only point of reference. Same goes for dept, choose a dark ref point close to the machine, and maintian contact with it until you are either able to rise above the snowball, or transition forward from it. Your choice of dept will be governed by an number of things that I really can't type out at this speed....lol
I wouldn't worry about above the tree-line work right now, that's a bit further down the road for you judging by your question, But, if you do find youreself going there, make sure you've got very good weather until you get some training and more experience in those areas.
Good luck, and remember this is by no means a complete lesson on snow flying, get some training with an experienced pilot if at all possible.
RH