This most likely does not apply to all latitudes, but now is the best season to clean the fridge. The temperature outside is about the same as it is in a fridge, which means it's so easy to empty the frigde and just take everything outside and then you are in no hurry with the cleaning. Like for instance you might run into delays like lets say you have a baby and in the middle of your cleaning project she desides it's not the time now to put all the things back to the frigde but in two hours it is. When a delay like that happens you are really glad you put all the food outside.
The season of cleaning the freezer comes bit later.