How do Toronto and Ottawa differ in average snowfall and temperature?

Toronto and Ottawa exhibit distinct differences in climate due to their geographical locations. While Toronto benefits from the moderating influence of the Great Lakes, Ottawa is located in a valley away from this influence, resulting in a cooler climate.12

Snowfall and Temperature Comparison

• Snowfall: Ottawa experiences significantly more snowfall than Toronto, receiving slightly more than 85 inches (2,160 mm) annually, compared to Toronto’s approximately 54 inches (1,370 mm).1
• Winter Temperatures: The mean temperature in January for the Ottawa valley is approximately 13 °F (−11 °C), which is notably colder than the average January temperature in Toronto, which sits in the low to mid-20s °F (about −4 °C).12
• Summer Temperatures: Ottawa’s mean temperature in July is about 69 °F (21 °C), while Toronto experiences slightly warmer average July temperatures in the low 70s °F (about 22 °C).12

These variations highlight how proximity to large bodies of water serves to moderate temperatures and influence precipitation patterns across Ontario.1