so we go out to 0 with kids 2 and up. My kids have been complaining any time it hits 30. So its snowpants and boots even though were snowless. I also sewed mittens to adult size socks (cut open at the toe). They go all the way up to the shoulder so once the coat goes on they cant come off!
The parents love them (and Ive had a few ask if they could get there own pair). so 0-20 15 mins max, 15-30 about 30 mins, 30 degrees to 35 were out a hour in the afternoon (3-4) 35-45 we stay out from 3 to 530ish. 45 or more and were out 3-6. Our playground has lights