Thunder Bay Consecutive 20 Degree Days
This page shows the record for the most days in a row in
Thunder Bay, Ontario where the
high temperature was
at least 20 °C, from 1941–2024.
Longest Streak: 77 Days
Between Jun 21 – Sep 6, 2012, the daily high temperature in Thunder Bay was always at least 20 °C – a span of 77 days.
| # Days |
When |
| * 77 |
Jun 21 – Sep 6, 2012 |
| 55 |
Jul 3 – Aug 26, 1955 |
| 54 |
Jul 9 – Aug 31, 1969 |
| * 52 |
Jun 25 – Aug 17, 1998 |
| 46 |
Jul 7 – Aug 21, 2019 |
| 45 |
Jul 2 – Aug 15, 2010 |
| 39 |
Jun 24 – Aug 1, 1974 |
| 38 |
Jul 12 – Aug 18, 2008 |
| 37 |
Jul 16 – Aug 21, 1988 |
| 36 |
Jul 14 – Aug 18, 2015 |
| 36 |
Jul 5 – Aug 9, 1983 |
| 35 |
Jun 16 – Jul 20, 2020 |
| 34 |
Jul 28 – Aug 30, 2011 |
| 34 |
Jun 22 – Jul 25, 1966 |
| * 32 |
Jul 20 – Aug 23, 1995 |
| 30 |
Jul 2–31, 2018 |
| 30 |
Jul 18 – Aug 16, 2007 |
| 30 |
Jul 10 – Aug 8, 1999 |
| 30 |
Jul 17 – Aug 15, 1943 |
| * 29 |
Jul 8 – Aug 6, 2021 |
Note: streaks marked with a (*) contain days with missing data