The Climate and Weather of Ottawa, Ontario

Average Daily Maximum Temperature – Minimum – Sunshine – Raindays – Snowdays – Snowdepth – Windspeed

Ottawa lies farther north than Toronto, resulting in significantly colder winters.


Unlike many of Ontario’s cities, Ottawa does not sit on the shores of Lake Ontario. This results in higher summer temperatures in Ottawa but increases the harshness of the winters.

Ottawa has a semi-continental climate, with a warm, humid summer and a very cold winter.

Winters in Ottawa are severe. Snow depths of greater than 1 cm are seen on about 120 days each year compared with about 65 days in Toronto. Much greater depths of snow are also found in Ottawa than Toronto.

Ottawa, like other cities in Ontario, enjoys a sunny climate. Summers usually have a generous number of warm or hot sunny days.

Winters are rather less sunny than in the prairie cities of Calgary and Winnipeg.

Ottawa suffers less smog than Toronto. Air quality can be classed as very good, good, moderate, poor or very poor. In 2012, Ottawa had 29 days of moderate air quality. The rest were good or very good.

Ottawa’s day-to day-weather can be changeable throughout the year.

Ottawa, Ontario

Month
of
year

Av. Daily
Max. Temp.
(°C)

Av. Daily
Min.
Temp. (°C)

Av. hours
Sun
(per day)

Av. Days
with
Rain

Av. Days
with
Snowfall

Av. Depth
Snow on
Ground (cm)

Av. Wind
Speed
(km per hr)

Jan.-6-153.34152114
Feb.-4-134.43112514
Mar.2-75.2682014
Apr.1116.3113214
May1987.4130012
Jun.24138.4130011
Jul.26158.9120010
Aug.25148.012009
Sep.20105.7140010
Oct.1244.4141012
Nov.5-22.8115113
Dec.-3-102.65131113