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‘The falling leaves’ are affected by a combination of weather and climate

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8min 23sec
Hart Van Denburg/CPR News
The aspen leaves are starting to turn fall colors above Montezuma in Summit County, Sept. 21, 2023.

Saturday is the official start of fall, which is why the state transportation department warns that mountain passes will be teeming with leaf peepers. In his regular chat with Colorado Matters, Denver7 Chief Meteorologist Mike Nelson explains the factors that contribute to autumnal displays. Plus, what we might see weatherwise this winter.