Average Precipitation for Ontario in May

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

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

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

Eastern Ontario

Average monthly precipitation in May
Days	Place	Inches	Millimetres
12	Belleville	3.2	81
14	Cornwall	3.4	88
13	Kingston	3.0	77
14	Ottawa	3.4	87
13	Pembroke	3.0	76

Central Ontario

May averages for total rainfall plus snowfall
Days	Place	Inches	Millimetres
13	Barrie	3.2	82
12	Brantford	3.2	81
12	French River, Chaudiere Dam	3.5	90
12	Hamilton	3.4	85
13	Huntsville	3.5	89
12	Midland	3.3	84
13	Niagara Falls	3.3	83
13	Oshawa	3.1	79
13	Peterborough	3.3	83
12	St Catharines	3.0	77
13	Toronto	3.2	82

Southwestern Ontario

Average amount of rain and snow in May
Days	Place	Inches	Millimetres
13	Chatham-Kent	3.1	80
13	Guelph	3.1	80
13	London	3.5	90
13	Owen Sound	3.3	84
13	Point Pelee National Park	3.0	77
13	Sarnia	3.1	80
12	Waterloo	3.2	82
12	Windsor	3.5	89

Northeastern Ontario

Precipitation totals for May
Days	Place	Inches	Millimetres
13	Chapleau	2.8	70
12	Gore Bay	2.4	61
13	Kapuskasing	2.7	69
12	Moosonee	2.1	55
14	North Bay	3.8	96
12	Sault Ste Marie	2.6	66
11	South Baymouth	2.8	72
13	Sudbury	3.3	83
13	Timmins	2.7	67
12	Wawa	3.1	78

Northwestern Ontario

Total precipitation during May
Days	Place	Inches	Millimetres
13	Atikokan	3.0	77
11	Big Trout Lake	1.6	40
12	Dryden	2.9	73
13	Fort Frances	3.1	78
13	Kenora	3.2	81
13	Red Lake	2.9	73
12	Thunder Bay	2.6	67