I live in Southern California but have also traveled a fair bit. I have found that the Dry weather helps but the Heat can make symptoms worse. For me I am better off in a colder dry atmosphere than in a Moist Cold Climate or Hot either way. Once the temp hits 80 my hr stays elevated above 100 sitting or standing. I was in South Texas and it was cold and humid and I couldn’t warm up for the life of me. Then I found battery heated clothing and was able to help keep my body regulated better. I still haven’t found a cool clothing that helps, ice packs can have to much of an impact. Personally I am looking to relocate to the North West where it is cooler and “Dry”. Even in Southern California the Barometer effects my headaches, and that can be just a front moving over Colorado to do that.
i hope that helps