There are lots of weather variations on the higher peaks, but they are usually 20 degrees F cooler than in the valleys, sometimes more. Much cooler at night. Last summer I hiked to a peak in the Cabinet Wilderness and noticed that the temperature there was 65. In the valley on the highway back toward home it was 95.
If everything else remains the same, temperature will decrease by about 5.4 degrees F for every 1000 feet increase in elevation. Certainly, the wind that is nearly always present at the mountain tops makes it feel even cooler.
I think they just display the variety formed by the tilting and pushing up of the mountains. These are a little less in elevation and farther away from the valley of the Clark Fork, so there appears to be less contrast.