Earliest and Latest Days at or Below 0° C in St. Catharines

This is a list of the earliest and latest days in a winter season where the low temperature fell to at least 0 °C in St. Catharines, Ontario history. It is based on NOAA data from the years 1882–2024.

Earliest freezing temperature in St. Catharines?

The earliest in a winter season that St. Catharines, Ontario has recorded a low temperature of 0 °C or below is September 22 which happened in 1929.

Latest freezing temperature in St. Catharines?

The latest in a winter season that St. Catharines, Ontario has recorded a low temperature of 0 °C or below is May 27 which happened in 1915.

Earliest Days ≤ 0 °C

Date	Year	Temperature
September 22	1929	0.0 °C
September 30	1991	-0.5 °C
October 1	1947	0.0 °C
October 4	1987	-5.0 °C
October 4	1981	-0.5 °C
October 4	1974	-1.1 °C
October 4	1945	0.0 °C
October 5	1935	0.0 °C
October 6	1984	-6.0 °C
October 6	1966	-0.6 °C
October 7	1984	-2.0 °C
October 7	1964	-3.3 °C
October 7	1938	-1.1 °C
October 7	1935	-1.7 °C
October 8	1974	0.0 °C
October 8	1952	0.0 °C
October 9	1937	-0.6 °C
October 10	1993	-1.0 °C
October 10	1979	-1.5 °C
October 10	1972	-0.6 °C
October 10	1929	-1.1 °C
October 10	1925	-1.1 °C
October 10	1902	-1.1 °C

Latest Days ≤ 0 °C

Date	Year	Temperature
May 27	1915	0.0 °C
May 25	1956	-1.1 °C
May 24	1925	0.0 °C
May 23	1967	-0.6 °C
May 21	1936	0.0 °C
May 21	1924	0.0 °C
May 20	1956	0.0 °C
May 19	1973	-1.1 °C
May 18	1925	-0.6 °C
May 17	1956	-0.6 °C
May 16	1936	-0.6 °C
May 16	1935	0.0 °C
May 16	1934	-0.6 °C
May 15	1920	-1.1 °C
May 14	1923	-1.1 °C
May 14	1912	0.0 °C
May 13	1994	-1.0 °C
May 13	1980	0.0 °C
May 13	1967	-0.6 °C
May 13	1928	-0.6 °C
May 13	1923	0.0 °C