Refrigerator Problem in Below 0 Weather

Is it normal to have refrigerator problems in below zero weather in the RV?

Coleen the RVing editor replies:

Fridge Should Work

It's possible that there could be too much cold air getting in around the burner so it can't heat the ammonia sufficiently for it to perk. If that's the case, it wouldn't cool properly.

However, we've been RVing in temperatures down to 38 degrees below zero, Fahrenheit, and have not had refrigerator problems. That was actual temperature, not windchill.