Vinyl Records - Shipping, max/min temperatures

Greetings.

I will be shipping my entire vinyl record collection soon, and am researching shipping methods.  It's too much for me to load them in my car or even my pickup truck.  The move will be cross country, about 2500 miles.

We all know that if vinyl is exposed to temperatures too high, they will likely warp.  I am thinking that this being January, excessively high temperatures are not likely to be encountered during shipping.   But what about low temperatures?  What would be the safest minimum temperature the vinyl could be exposed to without damage?