Cold makes the space between molecules lessen which makes objects such as garage doors contract.
Garage door stops opening cold.
If the door opens smoothly by hand the problem is with the opener.
If the garage door still only opens halfway the problem is with the door.
One of the most common reasons a garage door won t open in cold weather is that the metal has contracted.
Try to lift the garage door by hand.
If you find that it keeps running this can present a problem in your system.
In cold temperature the space between molecules reduces making the metal shrinks.
Then as you raise the door the strip peels and you lose the proper sealing that insulates the garage s interior.
Another reason that your garage door won t open all the way in cold weather is probably that the metal has contracted.
In a typical situation the motor for your garage door opener should stop running once the door has closed.