Oshawa Temperatures: Averages by Month

Days of Hot Weather in Oshawa

The hottest days at Oshawa usually have temperatures peaking in the low-thirties Celsius. The city averages four days a year with thirty-degree weather, which can show up from May to September. The temperature does climb over 35 °C (95 °F), but that's quite uncommon, happening on average just once every four years.

When Oshawa Has Frosty Weather

Oshawa typically has 126 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is April 29. Frost normally returns here on October 13. The frost-free period extends for 168 days on average between the final spring frost and the first fall frost.

How Often Oshawa Has Cold Temperatures

Oshawa's chilliest winter nights have lows in the minus-twenties °C (below -3 °F). The city averages just three nights a year, mainly in January, when the thermometer drops that low. Temperatures below -30 °C (-22 °F) do happen here, but are rare events.

From November to April, Oshawa can remain below freezing all day long. The city typically has 64 days a year when the temperature never rises above 0 °C.