"The weather that really promotes bright fall colors is a combination of sunny and cold, and we have been more sunny and warm," said Susan Dudley, a professor of biology at Hamilton's McMaster University. While temperatures have dropped recently, she said it might be too late for the physiological process that triggers trees to change their colors. "The weather has been strange, (it) has been very warm up till recently."
"Daylength, tree species and weather conditions are three key factors that determine the color of autumn leaves," according to experts. Eastern parts of North America in general, and Ontario in particular, typically have the right combination of these three factors, resulting in vibrant yellow, orange and red foliage," Dudley said.
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