It get hot down here in Roswell, NM too, but all you have to do is get up early before it gets too hot. Best time here is between about sunrise and 8:30 am, so it's easy to get in 2 hours or so. That's about all my legs will stand!
It's much worse here in South Georgia. 90 degree plus heat with 95 % humidity. I prefer hunting at daybreak for a couple hours or beach detecting this time of year where I can take a dip to cool off. It hasn't been cool here at Halloween since the 80's
Well for the most part I have been hunting the creek so I can take a dip if I need to. Also there is allot of trees that cover it so its not to hot. Although the ticks like me.