I hear the following weather reasons that people don't exercise: 1- It's too cold. 2- it's too hot. 3- it's too windy. 4- it's too slippery. 5, 6, 7, 8, et cetera. Some people are skilled enough at this game to have only a few good days a year to exercise.
My Pugsley is a snow-sand-mud bike. The wings are handlebar covers to keep my hands warm. Coldest ride so far is 28 degrees F. I burn a lot of calories going a short distance. I've commuted on it once (dry roads) and it takes some effort to keep the bike moving. I will get back in shape quickly with this beast.