Any kind of stay here in Sheridan. It has been known to snow in mid June. It don't lay, but can be cold enough to do so. Always bring clothing to dress warm should the occassion arrise. It has been 80 one day and 30 the next. July and August isn't bad. It stays warm. Be prepared for changing weather. They have a saying here in Sheridan, and elsewhere in Wyoming. If you don't like the weather, wait 5 minutes. This has proven true. I have seen it clear blue skies and 15 minutes later be extremely cloudy, wind blowing, and whateverelse the storm is bringing in. Main thing is to have a jacket.
Camping/Beach/Outdoor Gear: Camping??? Better have an extra sleeping bag. The mountains is bitterly cold around 5am. Plus you want to be prepared for a quick change in weather. Take a raincoat also in case you plan to hike. Take a radio for weather info.
Gore-tex, wool, and polar fleece items come in handy all year long. Especially, if you decide to spend time in the mountains bring a hat and gloves. Cloud Peak in the Bighorns is higher than 13,000 feet and it can snow any month of the year. Waterproof hiking boots are also a good idea.
Toiletries and Medical Supplies: You should also pack some bug spray and sun screen. The sun can really burn you at high elevations.
Photo Equipment: We have a great photo store in this town of 13,000 called Photo Finish that specializes in digital equipment as well as the basics.
Camping/Beach/Outdoor Gear: Be prepared for any kind of weather. The tempretures can have a 50 degree change in one day.
If there is anything i can tell you for sure about Wyoming, it's that the weather is the most unpredictible in the States. Bring everything you can think of, from shorts to winter gear.
Toiletries and Medical Supplies: I highly recommend bringing a large first-aid kit. Anything can happen, especialy when hiking, camping, or anything involving rigorous outdoor activities.
Photo Equipment: Batteries, Batteries, Batteries! I can't stress enough the importance of fresh batteries and film. I think we keep Duracell and Energizer in business!...LOL!!!