Page "Waterloo, Ontario" Paragraph 28

Waterloo has a humid continental climate of the warm summer subtype ( Dfb under the Köppen climate classification ); this means that there are large seasonal differences, usually very warm to hot ( and humid ) summers and cold ( to very cold ) winters.

Compared to the rest of Canada, it has moderate weather.

Winter temperatures generally last from the middle of December until the middle of March, while summer temperatures generally occur between the middle of May to close to the end of September.

Temperatures can exceed 30 ℃ ( 86 ℉) several times a year.

Waterloo has approximately 140 frost-free days per year.