The heat doesn't bother me either. I wondered in the beginning of MG if I was just denying it since I love the hot summers and the oppurtunity to have the whole desert to myself (rarely do people go out on the hottest days), but I have found that really the heat does not bother me or make my MG worse. I do have to drink plenty water and be sure not to get dehydrated-I am much more sensitive to lack of water with MG than I was before MG.
The cold is terrible for me and I have to minimize my time in the cold (less than about 75 degrees is cold).
I love temperatures between 80 and 105 degrees. Why is that? I don't know but it has always been this way for me. Maybe the heat doesn't effect my MG because I am already adapted to it (a body definitely works differently when it is adapted to heat---blood pressure, heart rate, etc).
I am so glad to hear that I am not the only one!!