The winter months can be extremely hard on aircraft (and pilots). Cold weather affects aircraft in a number of ways, few of them beneficial, but long periods of inactivity create problems, too. The best thing you can do for an aircraft is to fly it. So, let’s focus on mitigating the risks of winter flying and getting airborne as much as possible.
Source: aopaAircraft Maintenance: Mitigating the hazards of frigid weather