Stateside I live in Northern NY where it snows a lot and temps are not ideal but still worth a shot. Especially during the nice summer months.
I'm up in Western Canada, so we get about 7ish months of cold weather and sometimes snow (I feel like our recent winters have been pendulum-ing between thick fluffy snow Oct-May or a brown Christmas and frigid slush from January to May, the former is my favourite and the latter my bane).
I'm enjoying our super-sunny summertime right now, but come October I expect it to be colder. I do much prefer sweater weather, so the October-November months I think will be fun. I worry a bit about snow, but this winter I chatted with a cashier at my local store who bikes in and she recommended I just let out air in my tires for some extra grip. I'll have to plan for a longer bike commute, but I want to try it out.
I did walk to work in the winter when I first moved to my new place, and it's a nice walk in winter. I find it not too bad, especially since I bought new boots and a coat last winter.
My plan is to bike/walk as much as I can and only take the bus or my car if it's really, really horrible. Considering busing to work is the same cost as parking, it's not much of financial savings over driving.