Cornwall Consecutive 20 Degree Days
This page shows the record for the most days in a row in
Cornwall, Ontario where the
high temperature was
at least 20 °C, from 1867–2024.
Longest Streak: 117 Days
Between May 23 – Sep 16, 1952, the daily high temperature in Cornwall was always at least 20 °C – a span of 117 days.
| # Days |
When |
| 117 |
May 23 – Sep 16, 1952 |
| 97 |
Jun 9 – Sep 13, 1878 |
| 92 |
Jun 2 – Sep 1, 1955 |
| 90 |
Jun 16 – Sep 13, 1999 |
| * 87 |
Jun 6 – Sep 15, 1868 |
| * 86 |
Jun 13 – Sep 7, 1995 |
| 85 |
Jun 15 – Sep 7, 2018 |
| 85 |
Jun 18 – Sep 10, 2002 |
| 83 |
Jun 12 – Sep 2, 2006 |
| 83 |
Jun 19 – Sep 9, 2005 |
| 81 |
Jun 17 – Sep 5, 1993 |
| 78 |
Jun 21 – Sep 6, 2019 |
| 78 |
Jun 16 – Sep 1, 1984 |
| * 78 |
May 31 – Aug 29, 1867 |
| 75 |
Jun 29 – Sep 11, 2015 |
| 74 |
Jun 19 – Aug 31, 2022 |
| 74 |
Jun 14 – Aug 26, 2020 |
| 74 |
Jun 9 – Aug 21, 1983 |
| * 73 |
Jun 27 – Sep 9, 2012 |
| * 73 |
Jun 15 – Aug 27, 2003 |
Note: streaks marked with a (*) contain days with missing data