Last year, before I got my nesting boxes built, the hens were laying eggs in an unprotected area. When temperatures got done to <25 degrees Fahrenheit I had eggs freeze and break. Now that I have a protected nesting box inside the coop, there has been no problems. In the heat of the summer >90 degrees, I have left eggs in the nesting box for a couple of days and ad no problems.
As to refrigerating eggs, just remember this... If you wash the eggs you wash off the protective coating. Either rub them with vegetable oil or refrigerate them. IMHO