I'm in KY. Today it was in the 50's, but is has been down in the 20's this week with the wind blowing hard. When it's real cold, I stay in unless I just have to get out. When I was still working, my doctor's orders were that I could not get out until it got up to 20 degrees. When I worked for a nice person, he was fine with that, but he retired and the next person was not so nice. I gave it to him in writing from my allergist and he had to deal with it.
I always cover my nose and mouth when I'm outside when it's cold, and that's only to go to the car and wherever I'm going.
For any new asthma patients, the combination of inhaling that cold air while you are walking can be very dangerous. Be careful and remember to cover your face.
Take care all!