It is cold and snowy at the moment. Hi temps in the 20s and 30s; lows near zero sometimes. There has been snow on the ground for a few weeks now. Not much, though. It's more normal to have a little snow in the morning and have it gone by noon. Must be the global warming <grin>...
If you can find show in June/July here, it will be very unusual or at the very tops of high mountains, although we did run into a freak hailstorm in mid-August behind the Black Canyon one year. Typically in June/July, temps will be in the 80's and 90's. August is usually the hottest month.
There is rarely any significant humidity here to speak of.
As you get closer to your trip, let me know if you'll be coming through Colorado, and I'll tell you where the great roads are. -bg