It's the ice that has stopped me in the past. However we've not had a serious winter for a few years by me so it's not been an issue. Wind and rain I can by and large cope with. I quite like cold weather running. But I'm purely a road runner, so ice and mounds of snow are no-nos.
A race I did a couple of years ago on the moors just outside Otley in West York’s.
The snow was knee deep in parts and although it was well below freezing, it was surprisingly very warm up on the tops - no wind and bright sunshine.