Wyoming is quite windy, and during the winter there are frequent periods when the wind reaches 30 to 40 miles per hour with gusts to 50 or 60. Prevailing directions in the different localities vary form west-south-west through west to northwest.
http://www.wrds.uwyo.edu/sco/wyoclimate.html
The average relative humidity is quite low and provides delightful summer weather. During the warmer part of the summer days, the humidity drops to about 25 to 30 percent, and on a few occasions it will be as low as 5 to 10 percent.
http://www.wrds.uwyo.edu/sco/wyoclimate.html
The contrast in Jackson Hole between summer and winter is striking. Moose averages 14 feet of snowfall in the winter and often reaches into the 80s in the summer. As you climb into the mountains, temperatures drop 4°F for every 1,000 feet in elevation gain. Winter may not officially start until December 21, but the first heavy snows often fall by November 1. Between winter storms the days are sunny and the nights are frigid.
https://www.nps.gov/grte/learn/nature/weather.htm
The highest recorded temperature was 114 F on July 12, 1900, at Basin in the Big Horn Basin. The average maximum temperature at Basin in July is 92 F. For most of the State, mean maximum temperatures in July range between 85 and 95 F. With increasing elevation, average values drop rapidly.
http://www.wrds.uwyo.edu/sco/wyoclimate.html
Summer Weather in Jackson Hole. Although best known for winter, summer in Jackson Hole is equally as popular among visitors and locals alike. Temperatures are perfectly mild, ranging from the low 40s to low 80s Fahrenheit on a warm day.
http://www.jacksonholewy.com/area-information/weather/average-temperatures-in-jackson-hole/
Average Temperatures for Wyoming in January. Average temperatures for January at cities, towns, parks and lakes throughout Wyoming are listed below in degrees Fahrenheit and Celsius. The tables give the normals for maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center. You can jump to a separate table for each region of the state: Northwest, Southwest, North - Central, Northeast and Southeast Wyoming.
https://www.currentresults.com/Weather/Wyoming/temperature-january.php
There are usually several local storms each year with from 1 to 2 inches of rain in a 24-hour period. On rare occasions, 24-hour amounts range from 3 to 5 inches. The greatest 24-hour total recorded for any place in Wyoming is 5.50 inches at Dull Center, near Newcastle, on May 31, 1927.
http://www.wrds.uwyo.edu/sco/wyoclimate.html
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https://www.wunderground.com/US/WY/
Snowfall is 52 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 75. On average, there are 220 sunny days per year in Casper, Wyoming. The July high is around 89 degrees. The January low is 15. Our comfort index, which is based on humidity during the hot months, is a 67 out of 100, where higher is more comfortable. The US average on the comfort index is 44.
http://www.bestplaces.net/climate/city/wyoming/casper
For most places away from the mountains, the mean minimum temperature in July ranges from 50 to 60  F. Of course, the mountains and high valleys are much cooler with average lows in the middle of the summer in the 30s and 40s with occasional drops below freezing.
http://www.wrds.uwyo.edu/sco/wyoclimate.html
average weather in wyoming in july
The average weather in Wyoming in July is 89 degrees.