It is hard to say Jim as I have not really analyzed the data but from memory I will say I lose .1 - .2 from summer to winter. Both combos I'm running now are new with only 3-4 times out, and some tuning issues as expected.
I have lots of data for my old combos.
A normal spring/summer race here is high 80's low 90's with 75%+ humidity, Dart would run 5.46-7 in the heat, often with 130*+ track temps average d/a around 2600'. Come evening humidity goes up, dew comes in but cooler track results in many breakout runs. Dart would gradually pickup to 5.43 - 4
555ci when in my dragster was similiar, 4.82 would be the slowest in the heat/humidity, come evening it could pickup .02-3
Watching weather here is extremely critical as huge pockets of moist air of the gulf or atlantic can roll across the state at any time.
I learned a few years ago a lil' local trick called dialing off the street lights!