The research t I have found indicates tolerance for certain temps/weather among MSers varies as much every individual's experience with the disorder itself.
This high heat (above 90) with humidity is really hard on me...but lessen the humidity and I can easily stand 80 to 85. Go figure.
I do better when it's cold....ideally for me, given my unique experience with MS..would be lower humidity and moderate temps in the 70's to near 80. The area around Frankenmuth, Michigan would be prefect! I live near Indy...it's going to hit 90 today. 4 hours away in Frankenmuth it's sunny, low humidity and 75. I'm ready to get on the bus and go!!