My GE overhead Mirowave Oven stops working evry time the temperature outside goes down below approximately 25F. I tried turned it off and on and soes come back to life but will di as soon as we try to warm something. When th temp outsid goes up it comes back to lif.

Is the outlet for the microwave in a cabinet of an outside wall? If so, I would hire an electrician to check that outlet and wire. If they pushed the wires into the outlet (stab pins) I would put those wires on the screws.