This is an imporntant question. No if you go run at any real track you will be fine. This is more for the magazines that dont actually take the cars to the track but they set up a road side test. The magazines give performance figures if they even really test the cars at all. The magazine tests are not really accurate and almost all of the time they correct the times they get calling the adjustments DA correction.
So if your in california and its like 85 out the car isnt going to be as fast as it is wihen its 75. Generally when it gets hotter that effects DA there are a lot of things that go into the DA but to make it simple. The magazines post the corrected times for what the car would do in the optiomal conditions and not the conditions the car ran in. Alot of the time you get crap results and the resons why so many magazine times are useless.
Then again some cars are not as effected by weather as others so that just makes things that much harder. In the search for real truth and where our real beginning is you have to take what you really have in hand.