For the most versatility, use a piston model. Its been too many years but IIRC cold wasn't a large factor unless it was cold enough the lubricants get too thick. Lubrication is a couple of drops on a piece of felt that swabs the cylinder as its pumped. The Crosman 2100 looks like a remake of the one I had in the 80's. You can vary the power by the number of times you pump it. BB up to 755 fps Pellet: up to 725.