< Previous Year Next Year >

Cornwall Weather in 2021

Historical record of Cornwall, Ontario weather for the year 2021 based on NOAA data.
Jump to Month:
Year:
2021 Cornwall Weather Extremes
Highest temperature 34.0 °C July 26
Lowest temperature -21.0 °C February 13
Highest daily low 23.5 °C June 28
Lowest daily high -14.0 °C February 12
Most daily precipitation 4.1 cm July 20
Most daily snow 31.0 cm February 2
Total annual precipitation 90.3 cm -
Total annual snow 156.0 cm -
What was the hottest temperature in Cornwall in 2021?
The highest temperature recorded in Cornwall, Ontario in 2021 was 34.0 °C which happened on July 26.
Highest Temperatures: All-Time By Year
Highest Temperatures in Cornwall in 2021
Rank Temperature Date
1 34.0 °C Jul 26
2 33.0 °C Aug 21
2 33.0 °C Aug 10
2 33.0 °C Jun 7
5 32.0 °C Aug 26
5 32.0 °C Aug 25
5 32.0 °C Jun 27
5 32.0 °C Jun 6
5 32.0 °C May 21
10 31.5 °C Aug 11
10 31.5 °C May 20
What was the coldest temperature in Cornwall in 2021?
The lowest temperature recorded in Cornwall, Ontario in 2021 was -21.0 °C which happened 3 different times.
Lowest Temperatures: All-Time By Year
Lowest Temperatures in Cornwall in 2021
Rank Temperature Date
1 -21.0 °C February 13
1 -21.0 °C February 12
1 -21.0 °C January 31
4 -20.0 °C February 1
5 -19.0 °C January 30
5 -19.0 °C January 29
7 -17.0 °C March 2
7 -17.0 °C January 24
9 -16.0 °C February 18
9 -16.0 °C February 17
9 -16.0 °C January 23
January 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
January 1
 1.0 -3.0 1.10 11.0
January 2
 0.0 -5.0 0.10 1.0
January 3
 1.0 -5.0 0.00 0.0
January 4
 0.0 -3.0 0.00 0.0
January 5
 -2.0 -3.0 0.10 1.0
January 6
 -2.0 -3.0 0.00 0.0
January 7
 -3.0 -7.0 0.00 0.0
January 8
 -6.0 -8.0 0.00 0.0
January 9
 -2.0 -13.0 0.00 0.0
January 10
 -1.0 -10.0 0.00 0.0
January 11
 2.0 -7.0 0.20 2.0
January 12
 1.0 -1.5 0.00 0.0
January 13
 2.0 -3.5 0.00 0.0
January 14
 3.0 -2.0 0.00 n/a
January 15
 2.5 -4.0 0.50 0.0
January 16
 1.0 -2.0 1.30 13.0
January 17
 1.0 -1.5 0.00 0.0
January 18
 -4.0 -9.0 0.00 0.0
January 19
 -5.0 -14.0 0.20 2.0
January 20
 -5.0 -14.0 0.50 5.0
January 21
 -1.0 -15.0 0.90 9.0
January 22
 -2.0 -6.0 0.00 0.0
January 23
 -13.0 -16.0 0.00 0.0
January 24
 -12.0 -17.0 0.00 0.0
January 25
 -4.0 -15.0 0.00 0.0
January 26
 -4.0 -7.0 0.70 7.0
January 27
 -4.0 -7.0 0.00 0.0
January 28
 -10.0 -11.0 0.00 0.0
January 29
 -14.0 -19.0 0.00 0.0
January 30
 -13.0 -19.0 0.00 0.0
January 31
 -12.0 -21.0 0.00 0.0
February 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
February 1
 -4.5 -20.0 0.00 0.0
February 2
 -1.0 -14.0 3.10 31.0
February 3
 0.0 -4.0 0.00 0.0
February 4
 0.5 -7.0 0.00 0.0
February 5
 3.5 -10.0 0.20 2.0
February 6
 -2.5 -7.5 0.00 n/a
February 7
 -3.0 -12.0 0.30 3.0
February 8
 -5.0 -15.0 0.10 1.0
February 9
 -5.0 -12.0 0.20 2.0
February 10
 -5.0 -12.0 0.00 0.0
February 11
 -7.0 -13.0 0.00 0.0
February 12
 -14.0 -21.0 0.00 0.0
February 13
 -11.0 -21.0 0.00 0.0
February 14
 -6.0 -15.0 0.00 0.0
February 15
 -5.0 -12.0 1.50 15.0
February 16
 -5.0 -7.0 0.30 3.0
February 17
 -5.0 -16.0 0.00 0.0
February 18
 -4.0 -16.0 0.00 0.0
February 19
 -5.0 -10.0 0.50 5.0
February 20
 -5.0 -12.0 0.00 0.0
February 21
 0.0 -14.0 0.00 0.0
February 22
 1.5 -9.0 0.50 5.0
February 23
 3.5 -2.0 0.00 0.0
February 24
 4.5 -1.5 0.70 2.0
February 25
 -2.5 -6.0 0.00 0.0
February 26
 2.0 -11.5 0.00 0.0
February 27
 4.5 -11.0 0.80 5.0
February 28
 7.0 -4.0 0.30 0.0
March 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
March 1
 5.0 -2.0 0.00 0.0
March 2
 -1.0 -17.0 0.30 3.0
March 3
 3.0 -7.0 0.00 0.0
March 4
 -3.0 -9.0 0.00 0.0
March 5
 -5.0 -15.0 0.00 0.0
March 6
 -5.0 -11.0 0.00 0.0
March 7
 -5.0 -12.0 0.00 0.0
March 8
 -1.0 -14.0 0.00 0.0
March 9
 6.0 -4.0 0.00 0.0
March 10
 12.0 -6.0 0.00 0.0
March 11
 17.0 3.0 0.00 0.0
March 12
 7.0 2.0 0.00 0.0
March 13
 -1.0 -9.0 0.00 0.0
March 14
 -3.0 -5.0 0.00 0.0
March 15
 -6.0 -15.0 0.00 0.0
March 16
 4.5 -11.5 0.00 0.0
March 17
 10.0 -6.5 0.00 0.0
March 18
 7.0 1.5 0.00 0.0
March 19
 0.0 -10.0 0.00 0.0
March 20
 12.0 -3.0 0.00 0.0
March 21
 16.0 -1.0 0.00 0.0
March 22
 21.0 -4.0 0.00 0.0
March 23
 21.0 0.0 0.00 0.0
March 24
 15.0 4.0 0.60 0.0
March 25
 20.0 7.0 0.70 0.0
March 26
 9.0 6.0 1.60 0.0
March 27
 5.0 0.0 0.00 0.0
March 28
 9.0 1.0 0.80 0.0
March 29
 2.0 -2.0 0.00 0.0
March 30
 20.0 -2.0 0.00 0.0
March 31
 15.0 12.0 0.68 0.0
April 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
April 1
 3.0 0.0 0.00 0.0
April 2
 1.0 -7.0 0.00 0.0
April 3
 9.0 -5.0 0.00 0.0
April 4
 14.0 2.0 0.00 0.0
April 5
 14.0 2.0 0.00 0.0
April 6
 16.0 0.0 0.00 0.0
April 7
 17.0 1.5 0.00 0.0
April 8
 22.0 5.0 0.00 0.0
April 9
 25.0 7.5 0.00 0.0
April 10
 25.0 8.5 0.00 0.0
April 11
 19.0 6.5 0.00 0.0
April 12
 20.0 8.0 0.00 0.0
April 13
 18.0 7.0 0.00 0.0
April 14
 19.0 9.0 0.20 0.0
April 15
 9.0 7.0 1.80 0.0
April 16
 9.0 4.0 0.00 0.0
April 17
 12.0 3.0 0.00 0.0
April 18
 14.0 6.0 0.00 0.0
April 19
 16.0 5.0 0.20 0.0
April 20
 9.0 6.0 0.20 2.0
April 21
 -1.0 -2.0 0.30 3.0
April 22
 4.0 -5.0 0.00 0.0
April 23
 14.0 2.0 0.00 0.0
April 24
 19.0 6.0 0.00 0.0
April 25
 15.0 8.0 0.26 0.0
April 26
 11.0 -1.0 0.00 0.0
April 27
 15.5 0.5 0.00 0.0
April 28
 17.0 8.5 1.09 0.0
April 29
 16.0 8.0 1.04 0.0
April 30
 12.0 9.0 2.04 0.0
May 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
May 1
 11.0 -0.5 0.06 0.0
May 2
 15.0 3.0 0.00 0.0
May 3
 10.0 4.0 0.18 0.0
May 4
 15.0 5.0 0.24 0.0
May 5
 12.0 8.0 0.00 0.0
May 6
 15.0 6.0 0.00 0.0
May 7
 15.0 4.0 0.10 0.0
May 8
 16.0 6.0 0.20 0.0
May 9
 16.0 5.0 0.00 0.0
May 10
 17.0 7.0 0.00 0.0
May 11
 11.0 5.0 0.40 0.0
May 12
 17.0 5.0 0.10 0.0
May 13
 20.0 4.0 0.00 0.0
May 14
 22.0 8.0 0.00 0.0
May 15
 23.0 10.0 0.00 0.0
May 16
 25.0 10.0 0.00 0.0
May 17
 25.5 8.0 0.00 0.0
May 18
 26.5 13.0 0.00 0.0
May 19
 30.0 10.0 0.00 0.0
May 20
 31.5 14.5 0.00 0.0
May 21
 32.0 17.0 0.00 0.0
May 22
 28.5 19.5 0.32 0.0
May 23
 20.5 15.5 0.06 0.0
May 24
 22.0 10.0 0.00 0.0
May 25
 27.0 10.0 0.00 0.0
May 26
 29.0 17.0 0.00 0.0
May 27
 16.0 7.0 0.00 0.0
May 28
 13.0 1.0 0.00 0.0
May 29
 19.0 1.0 0.00 0.0
May 30
 19.0 3.0 0.00 0.0
May 31
 22.0 7.0 0.00 0.0
June 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
June 1
 24.0 12.0 0.00 0.0
June 2
 27.0 15.0 0.70 0.0
June 3
 18.0 15.0 0.92 0.0
June 4
 26.0 15.0 0.00 0.0
June 5
 30.0 18.0 0.17 0.0
June 6
 32.0 19.0 0.00 0.0
June 7
 33.0 20.5 0.00 0.0
June 8
 29.0 22.0 0.00 0.0
June 9
 30.5 20.0 0.00 0.0
June 10
 23.5 12.5 0.00 0.0
June 11
 25.0 13.5 0.00 0.0
June 12
 28.0 11.0 0.00 0.0
June 13
 31.0 12.5 1.10 0.0
June 14
 25.0 16.0 0.40 0.0
June 15
 21.0 15.0 0.10 0.0
June 16
 22.0 8.0 0.00 0.0
June 17
 26.0 9.0 0.00 0.0
June 18
 29.0 14.0 0.70 0.0
June 19
 27.0 16.0 0.00 0.0
June 20
 28.0 15.0 0.00 0.0
June 21
 30.0 17.0 0.42 0.0
June 22
 15.0 12.0 0.00 0.0
June 23
 22.5 7.0 0.00 0.0
June 24
 29.5 10.5 0.00 0.0
June 25
 27.0 17.0 0.42 0.0
June 26
 25.0 17.0 0.90 0.0
June 27
 32.0 23.0 0.00 0.0
June 28
 31.0 23.5 0.00 0.0
June 29
 30.0 20.0 0.00 0.0
June 30
 30.5 21.0 0.76 0.0
July 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
July 1
 25.0 14.5 0.00 0.0
July 2
 19.0 15.0 0.00 0.0
July 3
 20.0 14.0 0.00 0.0
July 4
 25.0 11.0 0.00 0.0
July 5
 30.0 12.0 0.10 0.0
July 6
 30.0 19.0 0.00 0.0
July 7
 19.0 14.0 0.00 0.0
July 8
 20.0 12.0 2.70 0.0
July 9
 21.5 14.0 0.00 0.0
July 10
 27.0 12.5 0.00 0.0
July 11
 26.0 13.0 0.00 0.0
July 12
 27.0 17.0 0.00 0.0
July 13
 28.0 19.0 2.60 0.0
July 14
 28.0 19.0 0.30 0.0
July 15
 29.0 18.0 0.66 0.0
July 16
 23.0 19.0 0.00 0.0
July 17
 24.0 16.0 0.32 0.0
July 18
 25.5 17.0 0.00 0.0
July 19
 29.5 16.5 0.10 0.0
July 20
 27.5 18.5 4.10 0.0
July 21
 25.0 15.0 0.00 0.0
July 22
 26.0 13.0 0.74 0.0
July 23
 26.0 14.0 0.00 0.0
July 24
 28.0 14.0 0.60 0.0
July 25
 28.0 18.5 1.10 0.0
July 26
 34.0 18.0 1.10 0.0
July 27
 20.0 14.0 0.70 0.0
July 28
 27.0 13.0 0.00 0.0
July 29
 21.0 12.0 0.12 0.0
July 30
 20.0 14.0 0.00 0.0
July 31
 24.0 11.0 0.10 0.0
August 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
August 1
 19.0 14.0 0.34 0.0
August 2
 22.0 13.0 0.00 0.0
August 3
 25.0 14.0 0.00 0.0
August 4
 26.0 15.0 0.00 0.0
August 5
 27.0 14.0 0.00 0.0
August 6
 29.0 17.0 0.00 0.0
August 7
 27.0 18.0 0.78 0.0
August 8
 28.0 17.0 0.98 0.0
August 9
 31.0 19.5 0.00 0.0
August 10
 33.0 19.5 0.70 0.0
August 11
 31.5 22.0 0.00 0.0
August 12
 29.5 23.0 0.00 0.0
August 13
 31.0 20.0 0.00 0.0
August 14
 26.5 19.0 0.00 0.0
August 15
 24.0 11.0 0.00 0.0
August 16
 26.0 12.0 0.00 0.0
August 17
 24.0 16.0 1.60 0.0
August 18
 29.0 21.0 0.20 0.0
August 19
 26.0 21.0 0.20 0.0
August 20
 31.0 20.0 0.00 0.0
August 21
 33.0 22.0 0.00 0.0
August 22
 31.0 21.0 0.00 0.0
August 23
 29.5 20.0 0.00 0.0
August 24
 31.0 21.5 0.00 0.0
August 25
 32.0 18.0 0.00 0.0
August 26
 32.0 20.5 0.00 0.0
August 27
 23.0 17.0 0.00 0.0
August 28
 18.0 16.0 0.94 0.0
August 29
 26.5 16.0 3.64 0.0
August 30
 28.5 21.5 0.00 0.0
August 31
 26.0 16.5 0.00 0.0
September 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
September 1
 22.5 12.0 0.00 0.0
September 2
 18.5 9.5 0.00 0.0
September 3
 22.5 11.5 0.00 0.0
September 4
 24.0 13.5 0.08 0.0
September 5
 23.0 15.0 0.60 0.0
September 6
 21.0 15.0 1.00 0.0
September 7
 24.0 12.0 0.00 0.0
September 8
 23.0 16.0 0.40 0.0
September 9
 25.0 14.0 0.20 0.0
September 10
 21.0 13.0 0.00 0.0
September 11
 24.0 12.0 0.00 0.0
September 12
 24.0 19.0 0.00 0.0
September 13
 23.0 13.0 0.00 0.0
September 14
 21.0 9.0 2.50 0.0
September 15
 21.0 18.0 0.00 0.0
September 16
 24.0 9.0 0.00 0.0
September 17
 26.5 11.5 0.20 0.0
September 18
 22.0 18.0 0.00 0.0
September 19
 21.0 8.0 0.00 0.0
September 20
 24.5 6.0 0.00 0.0
September 21
 26.0 14.0 0.11 0.0
September 22
 25.0 17.0 0.56 0.0
September 23
 27.5 18.5 1.36 0.0
September 24
 19.0 13.0 0.00 0.0
September 25
 23.0 10.0 0.00 0.0
September 26
 20.0 12.0 0.05 0.0
September 27
 16.0 12.0 0.45 0.0
September 28
 16.0 7.0 0.00 0.0
September 29
 17.0 6.0 0.00 0.0
September 30
 18.0 5.0 0.00 0.0
October 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
October 1
 18.0 5.0 0.40 0.0
October 2
 16.0 10.0 2.70 0.0
October 3
 12.0 11.0 0.20 0.0
October 4
 15.0 8.0 0.00 0.0
October 5
 17.0 12.0 0.00 0.0
October 6
 21.0 8.0 0.00 0.0
October 7
 20.0 7.0 0.00 0.0
October 8
 22.0 8.0 0.00 0.0
October 9
 21.0 10.0 0.00 0.0
October 10
 22.0 11.0 0.00 0.0
October 11
 22.0 13.0 0.00 0.0
October 12
 24.5 10.5 0.00 0.0
October 13
 21.0 11.5 0.00 0.0
October 14
 23.0 16.0 0.00 0.0
October 15
 22.0 15.0 0.40 0.0
October 16
 21.0 16.5 1.30 0.0
October 17
 14.0 7.5 0.10 0.0
October 18
 11.0 5.0 0.00 0.0
October 19
 15.0 4.0 0.00 0.0
October 20
 21.0 8.0 0.00 0.0
October 21
 17.0 12.0 2.18 0.0
October 22
 7.0 5.0 0.00 0.0
October 23
 9.0 1.0 0.00 0.0
October 24
 13.0 1.0 0.00 0.0
October 25
 7.0 3.0 0.78 0.0
October 26
 7.0 5.0 1.82 0.0
October 27
 11.0 4.0 0.00 0.0
October 28
 9.0 4.0 0.00 0.0
October 29
 13.0 0.0 0.16 0.0
October 30
 11.0 5.0 0.78 0.0
October 31
 12.5 9.0 1.84 0.0
November 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
November 1
 11.5 6.5 0.00 0.0
November 2
 9.0 3.0 0.00 0.0
November 3
 7.0 2.0 0.00 0.0
November 4
 7.0 -4.0 0.00 0.0
November 5
 8.5 -3.0 0.00 0.0
November 6
 11.0 1.0 0.00 0.0
November 7
 15.0 -1.5 0.00 0.0
November 8
 15.0 5.0 0.00 0.0
November 9
 15.0 7.0 0.00 0.0
November 10
 15.0 4.0 0.00 0.0
November 11
 13.0 -3.0 0.40 0.0
November 12
 12.0 5.0 1.12 0.0
November 13
 11.0 2.0 0.05 0.0
November 14
 7.0 2.0 0.84 0.0
November 15
 4.0 2.0 0.00 0.0
November 16
 3.0 0.0 0.00 0.0
November 17
 14.0 -5.0 0.50 0.0
November 18
 14.0 3.0 1.10 0.0
November 19
 4.5 1.5 0.00 0.0
November 20
 6.0 -3.0 0.20 0.0
November 21
 8.0 1.0 0.40 0.0
November 22
 4.0 1.5 0.00 0.0
November 23
 -2.0 -6.5 0.00 0.0
November 24
 5.0 -7.0 0.00 0.0
November 25
 6.5 -2.5 0.62 0.0
November 26
 4.0 1.0 1.12 4.0
November 27
 -2.0 -6.5 0.00 0.0
November 28
 -2.0 -8.5 0.00 0.0
November 29
 -1.0 -8.0 0.00 0.0
November 30
 2.0 -5.0 0.10 1.0
December 2021 Cornwall Weather
Day High (°C) Low (°C) Precip. (cm) Snow (cm)
December 1
 5.0 -2.0 0.00 0.0
December 2
 8.0 -3.0 0.15 0.0
December 3
 -2.0 -4.0 0.00 0.0
December 4
 -2.0 -9.0 0.20 2.0
December 5
 1.0 -7.0 0.20 2.0
December 6
 10.0 -5.0 1.10 n/a
December 7
 -3.0 -7.0 0.00 0.0
December 8
 -5.0 -9.0 0.20 2.0
December 9
 -5.0 -10.0 0.10 1.0
December 10
 1.0 -8.0 0.84 0.0
December 11
 15.0 -4.0 0.50 0.0
December 12
 6.5 1.0 0.00 0.0
December 13
 9.0 4.0 0.00 0.0
December 14
 3.0 0.0 0.00 0.0
December 15
 4.0 -5.5 0.46 1.0
December 16
 17.5 -1.0 0.00 0.0
December 17
 6.5 4.5 0.00 0.0
December 18
 -2.5 -4.5 0.90 9.0
December 19
 -6.0 -8.5 0.00 0.0
December 20
 0.0 -15.0 0.00 n/a
December 21
 0.0 -3.0 0.00 0.0
December 22
 3.0 -5.0 0.00 0.0
December 23
 -9.0 -15.0 0.00 0.0
December 24
 -5.0 -14.0 0.00 0.0
December 25
 -1.0 -9.0 0.00 0.0
December 26
 0.0 -6.0 0.00 0.0
December 27
 -7.0 -13.0 0.00 0.0
December 28
 1.0 -8.0 0.00 0.0
December 29
 -1.0 -4.0 0.00 0.0
December 30
 -1.0 -5.0 0.10 1.0
December 31
 0.0 -3.0 0.00 0.0
Next Year >
Weather Station Details
Years Station Coordinates
1950–2024 Cornwall location
1867–1887 Cornwall location
© H Brothers Inc, 2021–2024
Contact us | Privacy policy