Originally Posted by gljurczyk
When it gets above 32 degrees during the day and not below that for over 6 hrs a night.
That's your best answer. There are some who will tell you that your camper will freeze solid the instant the air temp gets down to 32. Those are the guys who put their campers up in October and don't use them again until May.
The air temp has to bring the water temp down to 32 before it will freeze, and that takes some time when the daytime temperatures have been warm. It has been in the 60's here, and later this week we're expecting a low of about 29. The temp will be below freezing for just a few hours, not nearly long enough to freeze the relatively warm water in the lines inside my camper.
We camped a couple of weeks ago and did not re-winterize, and we certainly aren't going to do it for a few hours of freezing temps following a daytime high of around 50 or 60.
Just take a close look at the weather forecast for the hourly temps in your area.