I live in the Phoenix area. There are a few other guys from Phoenix on this board. Everyone rarely meets up in the Phoenix area everyone is too busy doing other stuff Plus it is to freaking hot during this time, my R is so much slower in the 110 deg. weather.
We bake up here in North Cali too. 100+ degree temps here too! I fully understand the loss of power in temps like that. I am thinking of dynoing in the summer, and again in the winter without changing anything just to see if there is a difference.