Highest Daily Low Temperatures in Cornwall History

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

Highest temperatures all-time

Record for the highest daily low temperature in Cornwall

The highest low temperature for a calendar day in Cornwall, Ontario history was 26.0 °C which has happened 4 times, most recently on Tuesday July 1, 2014.

Rank	Temperature	Date
1	26.0 °C	July 1, 2014
1	26.0 °C	August 5, 2012
1	26.0 °C	August 10, 2001
1	26.0 °C	July 24, 2001
5	25.5 °C	August 4, 1988
6	25.0 °C	July 21, 2022
6	25.0 °C	May 18, 2017
6	25.0 °C	July 21, 2011
6	25.0 °C	July 5, 1999
10	24.5 °C	September 8, 2007
10	24.5 °C	August 2, 2006
12	24.4 °C	July 15, 1868
13	24.0 °C	July 1, 2018
13	24.0 °C	June 18, 2018
13	24.0 °C	July 22, 2011
13	24.0 °C	September 1, 2010
13	24.0 °C	July 19, 2005
13	24.0 °C	July 18, 2005
13	24.0 °C	June 25, 2005
13	24.0 °C	July 5, 2004
13	24.0 °C	August 9, 2001
13	24.0 °C	July 22, 1998
13	24.0 °C	July 14, 1995
13	24.0 °C	July 20, 1991
13	24.0 °C	July 24, 1987
13	24.0 °C	June 9, 1984