The biggest challenge is to find alternate routes when some of my regular routes have too much snow and are unsafe to ride. Some of the MUPS and sidewalks which I use in between to connect with roads and streets are impossible to ride when too much snow accumulates, so I have to find some alternative way which often adds extra time and distance and complexity to an already challenging commute. I've had a few " hike-a-bike" situations over the years and also had situations where I had to take a risk and ride on major arterial roads. The weather is not the main danger, I don't care how bad the weather is, the main danger is cars.