That temp fluctuation is not gonna make a difference. Who is testing and why is it not you? Personally, I only trust my own test results. I can make the best run of fiber look like crap just by changing some settings. In the reverse, I can make the worst path look much better than they really are. Good luck.
If you are not part of the solution, you are part of the problem. Quit being part of the problem!
This is CABL.com posting #361319. Tiny Link: cabl.co/mbF9T