If it is actually cold (Montana boy here) then you should get some cheap platforms and save your bike shoes for warmer weather. Bike shoes are expensive and are readily trashed by snow/mud/salt/cold/wet. I wear my winter boots (K-Mart version of Sorels) outside, and take them off inside. I have an office, which means I can leave some indoor shoes there, which is a darn good thing since I also have to take off the overpants, and jacket, and vest, and sweater, and jersey, and gloves, and overgloves, and neck gaiter, and earband, and hat......