You think 0 dgrees C is cold? Where do you live. Some of us would think of that as a warm winter day. You can work outdoors in a T-shirt and shorts at 0C.(posted 8617 days ago)Cold won't affect film speed. If you get it really cold (-80C) it will lessen reciprocity failure and maybe break when you try to wind it, but that's about it.
Just because there's snow doesn't mean you'll have to pull TMX, but you might if you have deep shadows. If you're thinking of an N-2 development, I'm not sure you can actually get that much contraction with TMX can you?