What is the story with turning on/waking up from sleep computers when they are cold? Is it a bad idea? I don't mean cold as in room temp, I mean as in sat all night in a car when it's -15 out cold? My ...

Is it OK to have a computer in a cold, humid environment? Specifically, it would be in a cold room, temperature is ~ 4°C, humidity varies, but seems to get pretty high when the condensers are going ...