what's the weather like in southern wyoming ??
To keep this on topic: the gun weather is always sunny and mild.
But if you're talking what it is like outdoors in Wyoming...well:
I have hunted on mornings when it's 30 below. I have fished on afternoons when it's 105. I have been on a mountain bike when I had to pedal to go downhill because I was facing the wind.
Generally, every day's forecast is this: "It's not for the faint of heart."