London Consecutive 30 Degree Days

This page shows the record for the most days in a row in London, Ontario where the high temperature was at least 30 °C, from 1883–2024.

Also see:

Longest Streak: 12 Days

Between Jul 17–28, 1964, the daily high temperature in London was always at least 30 °C – a span of 12 days.

# Days	When
12	Jul 17–28, 1964
12	Jul 30 – Aug 10, 1911
12	Jun 30 – Jul 11, 1911
11	Jul 8–18, 1936
11	Aug 4–14, 1918
11	Jul 19–29, 1918
11	Jul 10–20, 1916
11	Jul 2–12, 1912
10	Jul 1–10, 2020
10	Aug 26 – Sep 4, 1973
10	Aug 26 – Sep 4, 1953
10	Jun 29 – Jul 8, 1921
10	Jul 22–31, 1916
10	Jun 25 – Jul 4, 1901
9	Jul 23–31, 1941
9	Aug 1–9, 1930
9	May 31 – Jun 8, 1925
9	Jul 30 – Aug 7, 1923
9	Jun 17–25, 1923
9	Jul 2–10, 1897