Two answers. In general I "Winterize" (Head to upstate South Carolina) long about Halloween. or the first Sunday following the first Saturday in NOV (special party at church on said Saturday). and back mid-to MI (De-winterize) mid to late April .
Last spring I should have waited another week hit a major snow storm in Ohio but .. Got to MI and set up (No water yet in park. turned it on I think 2 days later but on board had abou 50 gallons when I got there or more).
But that is about the only time I look at the weather. If it is really bad I'll park till the storm clears.