I have friends who live in Minnesota & other frigid climes who run year round. With the right gear there is no such thing as too cold. While I will concede that with certain footing minimalist footwear is a problem. I do own a pair of yaktrax which probably wouldnt wear well over any flexible soled shoe.
You work with kids eh? Anyway to get involved in their play/free time? Put on some music and dance with them? Kids need to move too. Same with your kids playtime
MTA: because it is rare I dont have more to say
"When I got too tired to run anymore I just pretended I wasnt tired and kept running anyway" - my daughter Age 7