Average Annual Precipitation for Ontario

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The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in Ontario. Each place has a total for how many days of wet weather it usually gets a year and for the normal amount of precipitation.

The calculation of days only includes the days when precipitation totalled at least 0.2 millimetres (0.008 inches). The annual amount of precipitation is an average of weather data collected during 1981 to 2010.

You can jump to a separate table for each section of the province: Eastern, Central, Southwestern, Northeastern and Northwestern Ontario.

Eastern Ontario

Average yearly precipitation
Days Place Inches Millimetres
149 Belleville 35.9   912
150 Cornwall 39.8 1011
159 Kingston 37.8   960
161 Ottawa 36.2   920
170 Pembroke 31.4   798

Central Ontario

Annual averages for rainfall plus snowfall
Days Place Inches Millimetres
156 Barrie 36.7   933
136 Brantford 34.1   867
149 French River, Chaudiere Dam 37.7   958
149 Hamilton 35.3   897
154 Huntsville 40.7 1034
164 Midland 39.3   999
171 Niagara Falls 37.9   963
146 Oshawa 34.3   872
147 Peterborough 34.3   870
151 St Catharines 34.7   880
145 Toronto 32.7   831

Southwestern Ontario

Average amount of rain and snow a year
Days Place Inches Millimetres
137 Chatham-Kent 34.7   882
167 Guelph 36.7   931
168 London 39.8 1012
177 Owen Sound 43.9 1114
154 Point Pelee National Park 36.3   922
150 Sarnia 34.6   878
166 Waterloo 36.1   916
150 Windsor 36.8   935

Northeastern Ontario

The northeastern region of Ontario stretches from the shores of Lake Huron to James Bay. South Baymouth and Gore Bay are on Manitoulin Island in Lake Huron, while Moosonee is near the south end of James Bay.

Average annual precipitation
Days Place Inches Millimetres
181 Chapleau 31.9   809
159 Gore Bay 31.7   804
191 Kapuskasing 32.7   830
172 Moosonee 27.7   704
180 North Bay 41.1 1045
176 Sault Ste Marie 35.3   898
149 South Baymouth 35.8   910
167 Sudbury 35.6   903
184 Timmins 32.9   835
170 Wawa 38.2   970

Northwestern Ontario

Annual precipitation totals
Days Place Inches Millimetres
138 Atikokan 30.9   786
168 Big Trout Lake 24.6   624
152 Dryden 28.3   720
119 Fort Frances 28.6   726
153 Kenora 28.1   715
161 Red Lake 27.0   686
143 Thunder Bay 26.9   684
Reference

Environment Canada. Meteorological Service of Canada. Canadian Climate Normals. 1981-2010 Climate Normals & Averages.

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