Earliest and Latest Days of 25° C in Cornwall

This is a list of the earliest and latest days in the year with a high temperature of at least 25 °C in Cornwall, Ontario history. It is based on NOAA data from the years 1867–2024.

Also see:

Earliest 25 degree day in Cornwall?

The earliest in the year that Cornwall, Ontario had a high temperature of at least 25 °C is March 20 which happened in 2012.

Latest 25 degree day in Cornwall?

The latest in the year that Cornwall, Ontario had a high temperature of at least 25 °C is November 5 which happened in 2022.

Earliest Days ≥ 25 °C

Date	Year	Temperature
March 20	2012	25.0 °C
March 21	2012	26.0 °C
March 22	2012	25.0 °C
March 30	1977	25.6 °C
March 31	1998	26.0 °C
April 1	1986	27.0 °C
April 2	2010	26.0 °C
April 3	2010	29.5 °C
April 4	1981	25.0 °C
April 9	2021	25.0 °C
April 10	2021	25.0 °C
April 10	2017	26.0 °C
April 12	2006	25.0 °C
April 13	2015	25.5 °C
April 13	1968	25.0 °C
April 14	2014	28.0 °C
April 14	1968	26.1 °C
April 14	1869	30.0 °C
April 15	2003	25.0 °C
April 16	2012	28.5 °C
April 16	2002	29.0 °C
April 16	1869	26.1 °C

Latest Days ≥ 25 °C

Date	Year	Temperature
November 5	2022	25.0 °C
October 26	2022	26.5 °C
October 25	1963	25.6 °C
October 23	2020	26.5 °C
October 23	2017	25.0 °C
October 23	1979	27.0 °C
October 22	2007	26.0 °C
October 22	1979	27.0 °C
October 21	1979	25.0 °C
October 21	1867	25.0 °C
October 19	2007	27.0 °C
October 19	1963	25.0 °C
October 18	2016	26.0 °C
October 18	1998	27.5 °C
October 18	1968	25.0 °C
October 17	1968	25.0 °C
October 17	1951	25.0 °C
October 17	1878	25.6 °C
October 16	1968	25.6 °C
October 16	1962	25.6 °C