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Major cool down in Ontario

Bundle up if you plan to venture out and see the fall colours
Bundle up if you plan to venture out and see the fall colours

Matt Casey, staff writer

October 1, 2010 — Temperatures are set to plummet across southern Ontario this weekend.

Temperature comparison between Toronto and Yellowknife
Temperature comparison between Toronto and Yellowknife

Jackets, hats and even gloves should be on hand this weekend in much of southern Ontario. Temperatures have been relatively seasonal across the province this week, but a a major cool down is in store.

If you have any outdoor activities planned over the next couple of days, you'll want to make sure you dress warmly. Daytime highs may struggle to climb into the double digits, and overnight lows could fall to a chilly 0°C. To put those values into perspective, Yellowknife could feel warmer than Toronto on Saturday.

There's also a chance of some on and off rain showers, as well. The conditions will be ripe for lake effect showers to sweep across the province.

“The passage of a cold front on Thursday will bring in cooler conditions. The cooler air over the warmer waters of Lake Huron and Georgian Bay combined with a northwest wind will also bring the chance of lake effect showers,” explains Brian Dillon, a meteorologist at The Weather Network.

Past October snowfalls in Toronto
Past October snowfalls in Toronto

All of this talk of colder air may have some people wondering about the potential for snow. You won't have to dig out that shovel or snow blower just yet, but a fall flurry isn't completely out of the question.

In Toronto, the earliest flurries date back to September 20, 1956. Meanwhile, the earliest accumulating snowfall was on October 10, 1964. 0.8 cm of snow was reported.

The good news is, you won't need the full winter wardrobe just yet. After this weekend's cool down, temperatures are expected to rebound early next week.

“Southerly winds returning to southern Ontario from the Prairies will slowly bring temperatures back up to seasonal values,“ says Dillon.

For the latest weather details in your area, head to the Ontario Cities Index. You can also tune into The Weather Network on TV. The local forecast comes up at the top and bottom of each hour.

With files from Andrea Stockton

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