Pontiac Firebird 1967-2002 - How much does temp affect performance?

So I live in the all so wonderful Florida climate and I was wondering about how much of a difference the outside temperature can make in terms of performance. I ran my car several weeks ago for the first time and turned a 12.8 @ 116 mph. That day it was about 90-95 degrees out, so I would like to know if I would have a better time when it's cold outside or maybe a better dyno in the winter time because let's all face it, we all will do whatever we can for a better dyno number! :D

Does anybody has dyno comparisons or 1/4 mile slips?

Much appreciated!

-Price