My friend and I grew up in Oklahoma City so the "heat" up there didn't bother us but his Colorado native wife didn't like it too well. Summer weather is one of the main reasons for us relocating to Denver in the next few years.
I moved from Tulsa to Denver in 1990 and was there until 2005. As much as I loved the summers in Colorado, I could not take winter any longer. In 2005 I moved to Northern California (Lodi, 40 miles south of Sacramento) and have not looked back. Yes, it was a little more expensive but not as bad as people think. We have no winter to speak of; yes it rains a little but not enough to make you want to park your bike for more than a few days. The best part is two fold; some of the best riding in the US is within a two hour ride and ..................NO SNOW EVER!!!!!!!!!!!!
Ray