Average Temperatures in Ontario

Average annual temperatures for cities, towns and parks throughout Ontario are given below.

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

The tables list the maximum and minimum yearly temperatures, in degrees Celsius and Fahrenheit, based on weather data collected from 1981 to 2010.

Place name links take you to more detailed temperature information for that location.

Eastern Ontario

Average annual temperatures
High °F	Low °F	Place	High °C	Low °C
55	38	Belleville	13	4
54	37	Cornwall	12	3
52	36	Kingston	11	2
53	35	Ottawa	11	2
52	28	Pembroke	11	-2

Central Ontario

Temperatures averages for the year
High °F	Low °F	Place	High °C	Low °C
54	35	Barrie	12	2
56	37	Brantford	13	3
51	31	French River, Chaudiere Dam	10	-1
56	39	Hamilton	13	4
51	32	Huntsville	11	0
53	34	Midland	12	1
56	41	Niagara Falls	13	5
54	39	Oshawa	12	4
54	36	Peterborough	12	2
56	40	St. Catharines	14	4
55	43	Toronto	13	6

Southwestern Ontario

Annual average temperature
High °F	Low °F	Place	High °C	Low °C
57	42	Chatham-Kent	14	5
53	35	Guelph	12	2
55	37	London	13	3
53	38	Owen Sound	12	3
56	42	Point Pelee National Park	13	6
55	39	Sarnia	13	4
54	36	Waterloo	12	2
58	42	Windsor	14	5

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 yearly temperatures
High °F	Low °F	Place	High °C	Low °C
46	25	Chapleau	8	-4
50	34	Gore Bay	10	1
45	23	Kapuskasing	7	-5
42	20	Moosonee	6	-6
48	31	North Bay	9	-1
50	31	Sault Ste Marie	10	-1
50	34	South Baymouth	10	1
49	30	Sudbury	9	-1
46	24	Timmins	8	-4
46	26	Wawa	8	-4

Northwestern Ontario

Average annual temperatures
High °F	Low °F	Place	High °C	Low °C
47	27	Atikokan	8	-3
37	19	Big Trout Lake	3	-7
45	27	Dryden	7	-3
48	27	Fort Frances	9	-3
46	29	Kenora	8	-1
44	24	Red Lake	7	-4
48	26	Thunder Bay	9	-3

Average Annual Temperatures in Ontario

Eastern Ontario

Central Ontario

Southwestern Ontario

Northeastern Ontario

Northwestern Ontario

Reference

More Ontario Weather Information