Unfortunately, without a reset tool, you cannot reset it. Dealer can do the reset. Also with the cold weather, the pressure drops enough from the cold to set the fault. Had similar issues myself. It will set a fault when the pressure drops a certain percentage. Take a look at the pressure vs temp sticky in the wheels, tires, and brakes forum to see what your pressure should be cold.
You can also buy a reset tool from the dealer. About $25. I have one since I swap between summer and winter tires. Each with it's on set of sensors.