During Montana's Oct-Nov hunting season most temps run from 60 F to 0. Deer are moving early and late, generally just before and after sunrise and sunset. When it gets cold this time of year they can be out at any time but generally only leave cover to feed. We see at least 1 road killed deer a day in the 10 miles around my house from Aug -Nov. We had a cold snap just before Christmas, low was -34 High was -17. Since that time it is more like one dead deer a week. I think they have good feed somewhere and are not leaving until it's gone.
I had a hot air balloon ride with the neighbor yesterday and we flew 6 miles over prime food grounds as we headed to town yesterday. We left about 9:45 and saw no game in any fields where I have seen them feeding at dusk.