For most of the United States, December through February is cold, wet and snowy. It is very hard to play normal golf during those winter months, and as a result many pull back on the golf game during that time.
One of the first things to completely disappear from your game without playing is your chipping. This requires a lot of comfort, feel and touch to execute. And when things go south with the chipping, it can really go south with chunks and skulled shots that can destroy rounds.
Tip: If you don't have one already, buy a shag bag, fill it with about 40 balls and go chip with it at least once a week through the winter to maintain the short game. If you are in a place with snow on the ground, find a indoor practice facility or get a chipping net for your place. Maintaining the chipping will help for a fast start to good golf in the spring.