Earliest and Latest Days of 30° C in St. Catharines

This is a list of the earliest and latest days in the year with a high temperature of at least 30 °C in St. Catharines, Ontario history. It is based on NOAA data from the years 1882–2024.

Also see:

Earliest 30 degree day in St. Catharines?

The earliest in the year that St. Catharines, Ontario had a high temperature of at least 30 °C is April 25 which happened in 1990.

Latest 30 degree day in St. Catharines?

The latest in the year that St. Catharines, Ontario had a high temperature of at least 30 °C is October 7 which happened in 1941.

Earliest Days ≥ 30 °C

Date	Year	Temperature
April 25	1990	31.0 °C
April 26	1990	30.0 °C
April 26	1915	32.2 °C
April 27	1990	30.0 °C
May 1	1970	30.0 °C
May 4	1955	30.0 °C
May 5	1949	30.6 °C
May 6	1949	31.7 °C
May 7	1930	32.2 °C
May 8	1979	30.0 °C
May 8	1939	30.6 °C
May 8	1936	30.6 °C
May 9	1979	30.0 °C
May 9	1936	31.1 °C
May 10	1979	30.0 °C
May 10	1953	31.7 °C
May 10	1936	30.6 °C
May 11	1979	30.0 °C
May 12	1991	30.0 °C
May 14	1942	30.0 °C

Latest Days ≥ 30 °C

Date	Year	Temperature
October 7	1941	30.0 °C
October 6	1946	31.1 °C
October 5	1951	30.6 °C
October 4	1951	30.0 °C
September 28	1946	30.6 °C
September 27	1920	30.6 °C
September 26	1920	30.0 °C
September 25	2007	30.3 °C
September 25	1941	31.1 °C
September 25	1920	30.0 °C
September 24	1970	30.6 °C
September 24	1937	31.1 °C
September 23	2017	32.2 °C
September 23	1936	32.8 °C
September 23	1920	30.0 °C
September 22	1941	31.1 °C
September 22	1931	30.6 °C
September 22	1920	30.6 °C
September 21	2018	30.7 °C
September 20	1965	30.0 °C
September 20	1946	30.6 °C
September 20	1944	30.0 °C
September 20	1940	30.0 °C