It has been years since I lived there while growing up, but weather in Wyoming can be challenging at times. I lived in NE Wyoming but its not much different than central Wyoming as weather goes. I still get back to Wyoming and the surrounding area (SD and MT) at least once a year to shoot pd's.
The weather might be nice or not................ To illustrate, on occasions, my dad and I shot pd's in nice warm and sunny June weather when I was growing up there. On the flip side, I saw it snow on the 4th of July one year. IIRC, I was between a 9th and 10th grader when it happened. The temperature never got close to 40 degrees that day and with the wind blowing it was chilly trying to have a family picnic.
Not a great answer to your question, but it does illustrate that Wyoming weather can be challenging for outdoor activities even during what is called summer up there.
Whenever you go, pack a warm jacket, hat, and gloves just in case.
-BCB