Every winter I often wonder if our vacant homes will have issues due to an extreme cold day along our coast. Let's face it I live in Gulf Shores and we are not exactly use to thinking about pipes freezing. This year we are even trying to understand snow in Gulf Shores! I recently found a great outline on this topic at Weather.com. Below is what I learned. I hope this helps you as well.
When is it Cold Enough to Freeze?
It seems that the magic number is 20°F. The article states that the onset of freezing occurs when the outside tempatures fall below 20°F.
Below is a quote from the article:
"This finding was supported by a survey of 71 plumbers practicing in southern states, in which the consensus was that burst-pipe problems began to appear…