Like the rest of southern Ontario, Barrie has a humid continental climate, experiencing warm, humid summers and cold winters.
Barrie often experiences heavy thunderstorm activity in the late spring and summer months, due to its location within a convergence of breezes originating from Georgian Bay, Lake Ontario and Lake Erie.
In the winter months, the proximity to the Great Lakes results in significant snowfall in the general area. Barrie is on the southern edge of Ontario's snow belt region. An average of 238 centimeters (95 inches) of snow falls annually. Since the snowfall gradient is tight, snowfall totals tend to be significantly higher just north of the city as compared with the south end.
The highest temperature ever recorded in Barrie was 38.9°C (102°F) on 5 July 1911. The coldest temperature ever recorded was -38.9°C (-38°F) on 8 January 1866