Might be just me or maybe not BUT
I hate washing the car in the sun mainly due to the water drying of the car to fast.
Hosed down, Snow Foamed, went in to get my bucket filled. Came out and car is dry.... So another hose down, do one side then round the other side DRY.!!
Fighting a losing battle. Even worse trying to dry it so no water spots appear.
Just as well I could get the car inside to dry it.
sorry for the long story but sometimes washing the car in the winter is easier.