Cornwall Average Weather by Day
Data and chart of the the average high and low temperature for every day of the year in
Cornwall, Ontario , based on NOAA data.
Change city
What's the hottest day of the year in Cornwall?
On average, July 20 is the hottest day of the year Cornwall, Ontario. From 1991–2020, the average high temperature on July 20 was 27.4 °C and the average low was 17.1 °C.
What's the coldest day of the year in Cornwall?
On average, January 28 is the coldest day of the year Cornwall, Ontario. From 1991–2020, the average high temperature on January 28 was -4.1 °C, and the average low was -12.3 °C.
Average Temperature by Day
Average temperatures from 1991–2020. Daily averages are a mean of the period from 14 days before to 14 days after, inclusive.
Day
Average (°C)
High
Low
January 1
-2.3
-9.6
January 2
-2.4
-9.7
January 3
-2.5
-9.9
January 4
-2.6
-10.0
January 5
-2.7
-10.2
January 6
-2.9
-10.3
January 7
-3.1
-10.6
January 8
-3.3
-10.9
January 9
-3.3
-11.0
January 10
-3.3
-11.1
January 11
-3.5
-11.2
January 12
-3.6
-11.4
January 13
-3.7
-11.6
January 14
-3.7
-11.6
January 15
-3.7
-11.7
January 16
-3.8
-11.8
January 17
-3.8
-11.9
January 18
-3.8
-11.9
January 19
-3.9
-11.9
January 20
-3.9
-12.0
January 21
-3.9
-12.0
January 22
-3.9
-12.1
January 23
-3.9
-12.1
January 24
-3.9
-12.1
January 25
-4.0
-12.2
January 26
-4.0
-12.2
January 27
-4.0
-12.3
January 28
-4.1
-12.3
January 29
-4.1
-12.4
January 30
-4.0
-12.4
January 31
-4.0
-12.4
February 1
-3.9
-12.3
February 2
-3.8
-12.2
February 3
-3.8
-12.2
February 4
-3.7
-12.2
February 5
-3.4
-12.0
February 6
-3.2
-11.8
February 7
-3.1
-11.6
February 8
-3.1
-11.5
February 9
-2.9
-11.4
February 10
-2.8
-11.2
February 11
-2.7
-11.0
February 12
-2.6
-10.9
February 13
-2.4
-10.8
February 14
-2.3
-10.7
February 15
-2.1
-10.5
February 16
-2.0
-10.4
February 17
-1.9
-10.3
February 18
-1.9
-10.2
February 19
-1.8
-10.2
February 20
-1.7
-10.1
February 21
-1.5
-9.9
February 22
-1.3
-9.7
February 23
-1.1
-9.5
February 24
-0.9
-9.4
February 25
-0.7
-9.2
February 26
-0.5
-8.9
February 27
-0.3
-8.7
February 28
0.0
-8.4
March 1
0.2
-8.1
March 2
0.4
-8.0
March 3
0.6
-7.8
March 4
0.8
-7.6
March 5
0.9
-7.4
March 6
1.1
-7.3
March 7
1.2
-7.2
March 8
1.3
-7.1
March 9
1.5
-7.0
March 10
1.6
-6.8
March 11
1.9
-6.7
March 12
2.1
-6.5
March 13
2.4
-6.2
March 14
2.8
-5.9
March 15
3.1
-5.6
March 16
3.4
-5.3
March 17
3.7
-5.0
March 18
3.9
-4.7
March 19
4.2
-4.4
March 20
4.6
-4.2
March 21
4.8
-3.9
March 22
5.0
-3.7
March 23
5.2
-3.5
March 24
5.4
-3.3
March 25
5.6
-3.1
March 26
5.9
-2.9
March 27
6.2
-2.6
March 28
6.4
-2.4
March 29
6.7
-2.2
March 30
7.0
-2.0
March 31
7.3
-1.7
April 1
7.7
-1.4
April 2
8.0
-1.1
April 3
8.3
-0.8
April 4
8.6
-0.6
April 5
9.0
-0.3
April 6
9.4
0.0
April 7
9.8
0.3
April 8
10.1
0.6
April 9
10.3
0.9
April 10
10.6
1.1
April 11
10.8
1.2
April 12
11.0
1.4
April 13
11.2
1.5
April 14
11.4
1.7
April 15
11.7
1.8
April 16
12.0
2.0
April 17
12.3
2.3
April 18
12.6
2.5
April 19
12.9
2.8
April 20
13.3
3.1
April 21
13.7
3.3
April 22
14.1
3.6
April 23
14.4
3.8
April 24
14.7
4.1
April 25
15.0
4.3
April 26
15.3
4.6
April 27
15.6
4.8
April 28
15.8
5.0
April 29
16.0
5.2
April 30
16.2
5.4
May 1
16.4
5.6
May 2
16.6
5.8
May 3
16.8
6.0
May 4
16.9
6.1
May 5
17.1
6.3
May 6
17.4
6.5
May 7
17.6
6.7
May 8
17.9
6.9
May 9
18.2
7.2
May 10
18.4
7.5
May 11
18.7
7.7
May 12
18.9
7.9
May 13
19.1
8.2
May 14
19.3
8.4
May 15
19.6
8.6
May 16
19.8
8.8
May 17
19.9
9.0
May 18
20.1
9.1
May 19
20.2
9.3
May 20
20.3
9.5
May 21
20.4
9.6
May 22
20.5
9.8
May 23
20.6
9.9
May 24
20.8
10.1
May 25
21.0
10.2
May 26
21.2
10.5
May 27
21.4
10.6
May 28
21.6
10.9
May 29
21.8
11.1
May 30
22.0
11.3
May 31
22.1
11.5
June 1
22.3
11.6
June 2
22.5
11.8
June 3
22.7
12.0
June 4
22.9
12.2
June 5
23.1
12.4
June 6
23.2
12.6
June 7
23.4
12.8
June 8
23.5
12.9
June 9
23.6
13.0
June 10
23.8
13.2
June 11
24.0
13.4
June 12
24.2
13.6
June 13
24.3
13.7
June 14
24.5
13.9
June 15
24.6
14.0
June 16
24.7
14.2
June 17
24.9
14.3
June 18
25.1
14.5
June 19
25.3
14.7
June 20
25.5
14.9
June 21
25.7
15.0
June 22
25.8
15.2
June 23
25.9
15.3
June 24
26.0
15.4
June 25
26.1
15.6
June 26
26.1
15.6
June 27
26.2
15.7
June 28
26.4
15.8
June 29
26.5
15.9
June 30
26.6
16.1
July 1
26.6
16.2
July 2
26.7
16.3
July 3
26.8
16.4
July 4
26.9
16.4
July 5
26.9
16.5
July 6
27.0
16.6
July 7
27.1
16.7
July 8
27.1
16.7
July 9
27.1
16.8
July 10
27.1
16.9
July 11
27.1
16.8
July 12
27.1
16.9
July 13
27.2
16.9
July 14
27.2
16.9
July 15
27.3
17.0
July 16
27.3
17.0
July 17
27.3
17.0
July 18
27.4
17.1
July 19
27.4
17.1
July 20
27.4
17.1
July 21
27.4
17.2
July 22
27.3
17.1
July 23
27.3
17.1
July 24
27.3
17.1
July 25
27.4
17.0
July 26
27.3
17.1
July 27
27.3
17.1
July 28
27.3
17.1
July 29
27.3
17.1
July 30
27.2
17.0
July 31
27.2
17.0
August 1
27.1
16.9
August 2
27.1
16.9
August 3
27.1
16.9
August 4
27.0
16.8
August 5
27.0
16.8
August 6
26.9
16.7
August 7
26.9
16.6
August 8
26.8
16.6
August 9
26.7
16.5
August 10
26.7
16.5
August 11
26.6
16.4
August 12
26.6
16.3
August 13
26.5
16.3
August 14
26.5
16.3
August 15
26.4
16.2
August 16
26.2
16.1
August 17
26.1
16.0
August 18
26.0
15.9
August 19
25.9
15.7
August 20
25.9
15.7
August 21
25.8
15.6
August 22
25.7
15.5
August 23
25.6
15.5
August 24
25.6
15.4
August 25
25.4
15.3
August 26
25.3
15.1
August 27
25.2
15.0
August 28
25.0
14.8
August 29
24.9
14.7
August 30
24.7
14.6
August 31
24.6
14.4
September 1
24.4
14.3
September 2
24.2
14.1
September 3
24.1
14.0
September 4
24.0
13.8
September 5
23.9
13.6
September 6
23.7
13.5
September 7
23.6
13.3
September 8
23.5
13.2
September 9
23.2
13.1
September 10
23.0
12.8
September 11
22.8
12.6
September 12
22.7
12.4
September 13
22.5
12.3
September 14
22.4
12.1
September 15
22.1
11.9
September 16
21.8
11.7
September 17
21.6
11.5
September 18
21.3
11.3
September 19
21.1
11.1
September 20
20.8
11.0
September 21
20.6
10.7
September 22
20.3
10.5
September 23
20.1
10.2
September 24
19.9
10.0
September 25
19.6
9.9
September 26
19.4
9.7
September 27
19.2
9.5
September 28
19.0
9.3
September 29
18.8
9.0
September 30
18.5
8.8
October 1
18.3
8.7
October 2
18.0
8.5
October 3
17.7
8.3
October 4
17.5
8.1
October 5
17.2
7.9
October 6
16.9
7.7
October 7
16.6
7.5
October 8
16.3
7.3
October 9
16.0
7.1
October 10
15.8
6.9
October 11
15.5
6.7
October 12
15.1
6.4
October 13
14.9
6.2
October 14
14.6
6.0
October 15
14.4
5.9
October 16
14.1
5.7
October 17
13.9
5.4
October 18
13.7
5.3
October 19
13.4
5.1
October 20
13.2
4.9
October 21
12.9
4.7
October 22
12.7
4.5
October 23
12.5
4.4
October 24
12.3
4.2
October 25
12.0
4.0
October 26
11.8
3.8
October 27
11.5
3.6
October 28
11.2
3.4
October 29
10.9
3.1
October 30
10.6
2.9
October 31
10.4
2.7
November 1
10.2
2.5
November 2
10.0
2.4
November 3
9.7
2.1
November 4
9.4
1.8
November 5
9.2
1.6
November 6
9.0
1.5
November 7
8.8
1.3
November 8
8.5
1.1
November 9
8.3
0.9
November 10
8.0
0.6
November 11
7.8
0.4
November 12
7.6
0.2
November 13
7.4
0.1
November 14
7.2
-0.1
November 15
7.0
-0.2
November 16
6.8
-0.4
November 17
6.6
-0.6
November 18
6.4
-0.8
November 19
6.2
-0.9
November 20
5.9
-1.1
November 21
5.6
-1.3
November 22
5.3
-1.5
November 23
5.0
-1.7
November 24
4.7
-2.0
November 25
4.4
-2.3
November 26
4.3
-2.5
November 27
4.0
-2.6
November 28
3.8
-2.8
November 29
3.5
-3.1
November 30
3.2
-3.4
December 1
3.0
-3.6
December 2
2.8
-3.8
December 3
2.6
-4.0
December 4
2.3
-4.2
December 5
2.0
-4.5
December 6
1.8
-4.8
December 7
1.6
-5.0
December 8
1.5
-5.2
December 9
1.3
-5.2
December 10
1.1
-5.4
December 11
0.9
-5.6
December 12
0.7
-5.9
December 13
0.5
-6.1
December 14
0.3
-6.3
December 15
0.1
-6.6
December 16
-0.2
-6.9
December 17
-0.4
-7.1
December 18
-0.6
-7.3
December 19
-0.9
-7.6
December 20
-1.0
-7.9
December 21
-1.1
-8.1
December 22
-1.2
-8.3
December 23
-1.3
-8.3
December 24
-1.4
-8.4
December 25
-1.6
-8.6
December 26
-1.7
-8.8
December 27
-1.8
-8.9
December 28
-1.9
-9.0
December 29
-1.9
-9.1
December 30
-2.0
-9.2
December 31
-2.2
-9.4
Weather Station Details
Years
Station
Coordinates
1950–2024
Cornwall
location
1867–1887
Cornwall
location