TORONTO, Ont. – A low-pressure system brought snow and freezing rain to the streets of the Greater Toronto Area Monday, making for a messy commute, also causing school bus cancellations and flight delays.

Earlier Monday, school buses were cancelled in York, Peel, Halton and outside the GTA. Environment Canada issued a freezing rain warning for the GTA and much of southwestern Ontario early on Monday morning. That warning was ended shortly before 1 p.m. as the freezing rain changed to periods of rain and drizzle, the weather agency said.

Monday’s messy weather led to more than 160 flight cancellations at Pearson International Airport and travel advisories from Porter Airlines, Air Canada and WestJet.

Commuters were urged to use extra caution on the roads during Monday morning’s commute. Between midnight and 10 a.m., the OPP responded to over 750 calls, the majority of them single-vehicle collisions. There were no serious injuries, police said.

School boards across southern Ontario cancelled buses because of the weather. Click here for all weather-related cancellations and delays listed in our Extreme Weather Centre.

There’s a potential for thunderstorms on Tuesday, and Wednesday’s forecast high is a balmy 11 C.