I'll be heading to Montana in mid-July to do a multi-day, mountain bike ride in the Rockies. It's supported, so I don't have to worry about and hauling my gear and cooking, just ride every day and set up my tent when I arrive at each day's destination.
Seems Montana has summer thunderstorms, especially in the mountains. I've heard conflicting information about them, for example, they come and go quickly, or they're drenching downpours that can last for a long time, so I'm thinking of raingear, which I'll carry in a pannier on the bike. The range of raingear available now is huge, basically all claiming to keep out the rain and let through the sweat. I'm thinking of just getting a poncho, something like the one shown below for about $30.00. Or I could go for an actual rain jacket, though they're a lot more expensive. The Montbell jacket below is $179. I live in central Washington where it does not rain much. In fact, I don't currently own any raingear and have never missed having it. As far as my preferences go for gear, I tend more toward the pragmatic than the drool factor.
Anybody familiar with Montana weather in the Rockies in July? Thunderstorms? Mtn. biking there in the summer?