Climate and Region
Sarnia Average Temperatures and Precipitation
The climate of Sarnia is considered mild for Canada. Winters are cool but not very cold and summers are warm to hot, and occasionally humid. Lake Huron can create large temperature differences within the city in spring and early summer. Humidex readings can be quite high at times from late May to late September. Thunderstorms are common from April to September.
Sarnia Average Temperatures and PrecipitationThe climate of Sarnia is considered mild for Canada. Winters are cool but not very cold and summers are warm to hot, and occasionally humid. Lake Huron can create large temperature differences within the city in spring and early summer. Humidex readings can be quite high at times from late May to late September. Thunderstorms are common from April to September.
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