Cool temperatures leading to vibrant fall colours in Ontario: experts

Ontarians have been enjoying stunning orange, yellow and red fall colours this season and experts say the foliage is more vibrant than in recent years thanks largely to specific weather patterns.

Sean Thomas, a professor of forest ecology at the University of Toronto, says the fall colours in Toronto this year have been among the best he’s seen in years, especially after what he called last year’s “remarkably dull” fall.

He says lower temperatures but – not frost – combined with sufficient rainfall typically bring vibrant fall colours, whereas drier and warmer weather results in dull colours.

Ben Rubin, an assistant professor of forest ecology at Western University, says the fall colours this season have been bright and beautiful in his home city of London, Ont., as well.

He says leaves change colours based on three factors – species, the length of a day, and the weather.

Rubin says that since weather is the factor that varies from year to year in a similar provincewide pattern, a vibrant fall in one part of Ontario means similarly stunning colours can be expected in other parts too.

This report by The Canadian Press was first published Oct. 18, 2022.


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