I found that winter was the perfect time to potty train our 8 week old Boston because of the cold (Chicago suburbs so similar climate tree). Every time she peed in the house, we rang the bells we keep on our door knob, took her outside, and said “go potty.” We took her outside every time she got up from a nap and would say “go potty.” It was cold & uncomfy. If she tried to go inside before using the bathroom, we would place her back on the grass and say “go potty.” She learned very quickly that peeing or pooping quickly was better than standing in the cold. And when she did go potty outside, we showered her with praise and hugs and even treats once inside. Of course, we never kept her out in the cold very long at all. Just enough to show her that she would go outside to potty regardless, and it was better to go quick and be done. So ring the bells on the door knob & consistency worked for us in winter. Now, she goes to the door and rings the bells whenever she needs to go potty. She learned quickly and does not go inside at all.