Believe it or not, your automatic gate is affected by cold weather. Metal contracts in low temperatures, which can cause your automatic gate to stick. There is also the problem with the battery which is encased in a metal box. In winter, the internal temperature of the battery drops making it hard for it to start because of a reduction in the electro-chemical reaction that produces the electrical current that powers the gate. A clicking sound indicates that the battery solenoid switch has low power.
These problems with an automatic gate can be prevented by using a grease made specifically to keep metal from contracting when it is cold. Even a custom gate needs this.