Shooting CO2 guns when the temprature drops

Well, here in Mississippi we don't get many cool snaps, but we did yesterday. I was shooting my disco and everything was going just fine. So I decided to bring out my Crosman 2400KT and use up some of the pellets that doesn't shoot so well well through the disco. It started off fine, then I noticed it was dropping a few. I watched a few. I walked down to the target at 20 meters, and couldn't believe only 2 shots had even hit paper. CO2 is a strange thing when it's cold out. 

It has been over 90 degrees here since May, lol, CO2 doesn't like cooler temps, that's for sure. Anyone know when this occurs ? It was 72 here yesterday.

Mitch