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  5. Ontario Weather


Ontario Weather

The far-southern regions of Ontario experience pleasant spring weather, warm and humid summers, crisp fall conditions and cold winters; abundant snow along the Great Lakes is commonplace.

Generally the central regions (Thunder Bay across to North Bay) have longer and somewhat colder winters with copious amounts of snowfall. Summers can be pleasant, and on occasion, quite warm.

The northern reaches of the province (to the north of Lake Nipigon) are in a subarctic climate. Long cold winters and short, cool to warm summers are the norm. Arctic air masses here regularly produce low winter temperatures of near -40.0 °F, and snowfall remains on the ground for much of the year, especially in the Hudson Bay area.

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Seasonal Temperature Averages:

High / Low Temperatures ( Fahrenheit )

(Jan) 29/18 (Feb) 30/19 (Mar) 38/27 (Apr) 50/36

(May) 61/46 (Jun) 71/55 (Jul) 77/61 (Aug) 76/62

(Sep) 68/55 (Oct) 56/44 (Nov) 45/35 (Dec) 35/24


High / Low Temperatures ( Fahrenheit )

(Jan) 16/-6 (Feb) 21/-3 (Mar) 32/11 (Apr) 48/26

(May) 60/36 (Jun) 69/45 (Jul) 76/52 (Aug) 73/50

(Sep) 63/41 (Oct) 51/32 (Nov) 36/19 (Dec) 21/2

About the Author

John Moen is a cartographer who along with his wife are the orignal founders of worldatlas.com. He and his wife, Chris Woolwine-Moen, produced thousands of award-winning maps that are used all over the world and content that aids students, teachers, travelers and parents with their geography and map questions. Today, it's one of the most popular educational sites on the web.

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This page was last updated on July 14, 2016.