Which is colder, Ottawa or Montreal?

Ottawa is colder.

Montreal is at the intersection of several climate zones, so the weather varies, with extremes between winter and summer. Spring usually arrives in May and is short-lived. The summer is hot with occasional thunderstorms, but the autumn is cool and pleasant. Rainfall here is very abundant, with an average annual rainfall of 897mm.

January is the coldest time of the year, with an average daily temperature of -10.4°C. The hottest month of the year is July, with an average daily temperature of 20.9°C. In winter, since there are no mountains across the north, the strong cold airflow from the Arctic can sweep across the land of Ottawa without any hindrance, making the climate cold and snowy.

The average temperature in January is -11℃, making it one of the coldest capitals in the world, with the lowest temperature ever reaching -39℃. According to statistics from the Meteorological Department, the night temperature in Ottawa is below zero for about 8 months every year, so some people call it the "cold city".