M.S.
I prefer to do it when it is hot so that the dog is not freezing from the cold hose water! It would probably feel good right now for her since it is hot. She will dry fast. Towel her down and then like 15 minutes later she is dry enough to come inside. I will do it anywhere from 60 degrees +. Under 60 degrees I wash her in the bathtub b/c I think she would get too cold.