Howard N. has lots of practice doing drills during in the winter as he lives vic of Anchorage AK. I have read that he trains in parking lots in the winter but I don't know what the conditions are. Maybe he could chime in here with some advice on winter training drills.
I just sent Howard N. a PM and asked him to chime in here about parking lots in the winter. Howard is a great trainer and was qualified for the national am ft this past year and other years too. I would heed his advice.