From what I've seen here in MI, when cold weather first rolls in, they tend to move a bit more during daylight hours. When it really gets cold out, they will move during the day when temps get a little warmer. True about the fronts - just like bass fishing, deer go on a feeding nut prior to a front or storm. It's said that deer movement will be best when there is a steady high pressure or a climging barometer rather than a low and steady, or falling baromoter. (Which coincides with storms and whatnot) When it gets extremely cold, deer will bed down for days on end not moving at all. Their metabolism slows way down so they conserve energy. They feed when they have to or when it gets warmer during the day. Of course, rut and hunting pressure can change deer behavior.