Last summer, Calgary cracked 30 C just once. A group of students enjoy some beverages by the Elbow River in Calgary on a hot, summer day. This year, Calgary has seen more than double the number of heat warnings than what's considered typical. Environment Canada issues on average two to three heat warnings through the city's summer months, based on 2000-2015 data. 139.8: the rainfall in millimetresLast summer, Calgary received nearly 2.5 times that amount, at 341.5 mm.

Source: CBC News August 31, 2017 18:00 UTC