I found this chart showing propane tank pressure at various temps. It shows we will have zero psi in our westy tanks at about -43 degrees. 

http://www.glacierbay.com/ptchartpropane.asp

Just curious if anybody ever camped in below zero or severe cold does the stove still work? Fridge ever go out. 

Not that you need a fridge in 10 degree weather of course.