Like IO540 said. Or hit the books and look what they say about carb ice. I also think there's an AIC or something about it.
Winter offers fantastic flying opportunities, but you've got to keep track of the weather and seize the moment. You can't expect bookings three or more weeks in advance to work.
Best flying is just after a cold front has passed through. Unlimited visibility, crystal clear air, excellent aircraft performance, virtually no turbulence. And if the cold front dumped a lot of snow, you get an amazing scenery too.
Technically speaking, like A&C said, don't fly with ice on the airframe. Be careful with all kinds of scrapers as windshields are easily damaged: Ask the owner/operator how they want you to de-ice the plane. Revise your starting technique as winter is really hard on the batteries. Ideally you will want to start the engine immediately but this only works with proper priming and the right throttle/mixture setting. Be gentle on the engine too: warm it up properly, don't make rapid power changes if you can avoid it, shut it down properly. Know how the heater and defrost work - it's not always obvious, and sometimes quite different from what you find in your car.
On larger airports you may find that not all intersections and taxiways get equal priority in getting cleared. Even at your home airport, you might get different taxi routes than normal. If you go to minor airports, particularly grass strips, you might find the snow not cleared at all. Remove wheel spats in advance as they easily clog up, and keep a very careful eye on the brakes during the preflight.