We had one in our house for several years when we lived in north western Ontario. Cold weather was not a problem, and I remember several days and nights seeing -30 and colder. The mechanism is on the inside so it doesn't see the worst of the cold. The operating solenoid had lots of oomph to move the lock in the coldest weather. The lock has a low battery alarm that gives you a few days warning. There is a key lock on the mechanism that can be used if the battery fails. (I know it defeats the purpose, but I always carried a key just in case.) It was great for our kids who could not get the hang of not losing their keys.
On the down side, the lock did not match the profile of the one that was previously in the steel door, and some cutting was required. That was not fun. Stores don't stock many different finishes and it may be difficult to match the knob or latch you have now. I checked at Home Depot a couple of year ago when we moved to a new house, and all they had was the polished gold and antique brass models. There was not a match to the pewter finish our installed set had. I believe they do make several different finishes, but many of them are special order, and even then are not guaranteed to match what you have. You can buy the rest of the knob/latch hardware to match the finish, but there may be even more work to fit your door.
Cogeco; Motorola 6208 STB;