Quoted from KozMckPinball:Cold weather is low humidity weather. However, electronics might be an issue in frigid weather.
In Chicago, cold with snow and freezing rain equals awful humidity.
There was a nice article in GameRoom magazine about lowering humidity inside of EM machines in a garage. Basically add a porcelain bulb socket in each lower cabinet near the back. Install a 60 watt, old school incandescent (not CFL, not LED) bulb and connect to a timer. Run for aboot 2 hours every day.