The agency says people should take extra care when walking or driving in affected areas because snow has caused slippery road conditions and reduced visibility.
It says drivers should watch for tail lights ahead and maintain safe distances from other cars.
About five to 10 centimetres of snow covered most of southern and eastern Ontario.
The affected area spans from Waterloo Region east to Cornwall and as far north as Barrie and Peterborough.
Environment Canada says five more centimetres of snow are expected in Ottawa and two more centimetres are expected in the Greater Toronto Area this morning.
First snowfall hits the GTA
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