ReelFlyBro, I was well out of high school and had finished a degree from Penn State before I moved to Montana at age 25 in 1979. Lived there until 1991 when I saw the light and moved to northwest WA where the temps don't get so cold in winter and the rain makes for much better fishing than snow and frozen rivers. I lived in Great Falls, Cascade, Billings, Hot Springs, and Boulder. The only month I was never snowed on in the valleys was July. Heck the last year I lived there (1991), I was living in Boulder and it snowed 12" the 2nd week June. Granted the temp was 80 degrees 3 days later, but it sure wasn't 80 degrees when the foot of snow stuck to the ground. I also very vividly recall fishing the upper Madison the 3rd week of August in 1981. I was tent camping and woke up to 4" of snow on the ground and it was still snowing. And on Labor Day in 1984, I was fishing at the mouth of Beaver Creek on the Missouri when it started snowing and by 10 that night it was below zero where I lived in Cascade. Again, granted, it warmed up to the mid-70's a few days later. But when it starts to snow at around 3800' elevation in the afternoon when the morning temp was about 60 when I left the house, and by 10 that night it is below zero, that is darn cold. To be fair, I've also seen the temp in Montana stay in the 50's and 60's until after Christmas, and then it would drop below zero. Heck, I recall many old timer saying there were 2 seasons in Montana, 9 months of winter and 3 months of summer.