Yellow frost advisory for Toronto and Peel, Halton tonight into Tuesday morning
Environment Canada expects frost to form north of the 401 overnight, with a low near 3 to 4 C and mild weather returning by Wednesday.
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Environment Canada has issued a yellow-level frost advisory for Toronto, Peel and Halton regions, with temperatures expected to drop to near the freezing mark Monday night.
The agency said in its alert: "Patchy frost is expected to develop tonight into Tuesday morning, particularly for areas north of the 401 corridor." Monday's low is forecast near 3 to 4 C, with a high of 16 C, sunny breaks and a slight chance of showers.
Tuesday is forecast to reach 10 C with a low near 2 C, as cooler air persists. Mild conditions are expected to return to the GTA from Wednesday through the weekend, with highs of 14 C Wednesday, 20 C Thursday and 16 C Friday. The forecast for Halloween is mild and dry.
Another forecaster put Monday night's low at 4 C and gave slightly different highs for Tuesday and Wednesday, so expect some variation.
