I did some damn hot rides when I live in west Texas. I recall a TT when it was 115F; I rode out there, did the 10 miles, and rode home. I did a full brevet series - 200k, 300k, 400k, 600k, as well as a string of 200k perms and a couple 100k populaires. The 600k was in the Permian Basin; it was near freezing when we departed, and well over 100 in the heat of the day. The desert's like that. I did ride a few 200k perms overnight - more to avoid the sun than the heat. The sun is killer.
When I moved from west Texas to Portland OR, I was making the conscious decision to trade heat for 50F and rain. That first winter in Portland was tough for me; I struggled with everything about riding in cold rain.
After 3 years... 50 and rain? Pffft. Throw on some wool and a shell, and go.
Now we had a couple west Texas heat days in Portland, and I say bring back the cold rain.