Tyres don't deflate if the cap is missing,they would only deflate through the valve if it was broke,not sure if people know this but the name of it kinda gives away it's intended purpose i,e dust cap.
hahah marquis you're a real scientist. as the air cools, the water/air particles in the air in the tire condense, deflating the tire. if you the heat up the tire for a while, it will again inflate, but yes, tires, basketballs, and anything else inflated deflates in the cold.
dude, i was inside then i took it outside beside my garage to take some pics then i put it back inside. And right now all the snow is basacly melted....
and rust if from riding in the rain and shit...