Weather and environmental factors in early fall leaf color changes

To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video

SOUTH BEND, Ind. -- Fall is approaching, but some of the signs of the season are showing prematurely. Michiana has just emerged from the infamous “false fall,” experiencing several days of cooler-than-average temperatures, also accompanied by dry conditions.

Mark Evans, Plant and Soil Educator at the Purdue Extension Office, explains how weather plays a significant role in how and when leaves change during the fall months.

Evans says, “Shorter day length, longer nights, is what actually causes us to have the fall color.” Frost or freeze is not ideal, he explains, but cool nights, warm days and moisture are what will bring the vibrancy for fall.

As we receive less sunlight, it