Highest Temperatures in Cornwall History

This is a list of the 20 highest temperatures ever recorded in Cornwall, Ontario history from 1867–2024 based on data from the NOAA.

• Highest temperatures by year
• Lowest temperatures all-time
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Rank	Temperature	Date
1	37.8 °C	July 14, 1868
2	37.5 °C	July 10, 2020
3	37.2 °C	July 10, 1881
4	36.7 °C	July 15, 1868
5	36.5 °C	August 8, 2001
6	36.1 °C	July 25, 1870
7	36.0 °C	July 9, 2020
7	36.0 °C	August 14, 2002
9	35.6 °C	August 1, 1975
9	35.6 °C	July 23, 1955
9	35.6 °C	July 22, 1955
9	35.6 °C	June 18, 1870
9	35.6 °C	May 31, 1869
9	35.6 °C	July 13, 1868
15	35.5 °C	July 16, 2018
15	35.5 °C	August 4, 2012
17	35.0 °C	July 7, 2020
17	35.0 °C	June 22, 2020
17	35.0 °C	May 27, 2020
17	35.0 °C	July 5, 2018
17	35.0 °C	July 4, 2018
17	35.0 °C	July 2, 2018
17	35.0 °C	July 1, 2018
17	35.0 °C	July 21, 2011
17	35.0 °C	May 26, 2010
17	35.0 °C	August 9, 2001
17	35.0 °C	August 3, 1988
17	35.0 °C	July 12, 1987
17	35.0 °C	August 2, 1975
17	35.0 °C	June 30, 1964
17	35.0 °C	July 1, 1963
17	35.0 °C	August 6, 1955
17	35.0 °C	August 5, 1955
17	35.0 °C	August 2, 1955
17	35.0 °C	August 1, 1955
17	35.0 °C	July 21, 1955
17	35.0 °C	August 19, 1884
17	35.0 °C	August 31, 1881
17	35.0 °C	June 27, 1870
17	35.0 °C	July 4, 1868
17	35.0 °C	July 2, 1868
17	35.0 °C	August 9, 1867