When I was a teen in the NE we had a ritual that the first day it hit 70º we'd all jump in the river (small, local, clean variety). Some years that was early in April, and there might still be ice on the edges of the river! In that vein, I reduce my winter heavy beard to a spring light/partial one around the first time it hits 70º. I used to grow it every winter and shave the whole thing off every spring... but somewhere in my late 40's I just decided I needed to keep some on year round. It can change in form and usually does, but I haven't had a naked face in a long time.