St. Catharines Weather Records

St. Catharines, Ontario weather averages and records from 1882–2024 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in St. Catharines, Ontario was 40.0 °C which occurred on July 10, 1936.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in St. Catharines, Ontario was -24.4 °C which occurred on December 27, 1925.
Lowest Temperatures: All-Time By Year
St. Catharines Weather by Month
Averages based on the years 1991–2020
Month Average (°C) Record (°C) Average (cm)
High ☀️ Low 🌙 High ☀️ Low 🌙 Precipitation 💧
January 0.5 -5.7 20.0 -23.5 3.6
February 0.9 -5.1 19.4 -23.9 3.2
March 4.7 -1.8 26.7 -19.4 4.0
April 11.0 3.5 32.2 -15.0 7.6
May 17.1 8.5 32.5 -4.4 6.9
June 22.9 14.7 36.1 1.0 8.1
July 26.2 18.4 40.0 4.0 6.6
August 25.6 18.3 38.3 4.0 5.5
September 22.0 14.8 36.7 -0.5 6.7
October 15.3 8.5 31.1 -7.0 5.7
November 8.8 3.1 26.4 -13.9 5.4
December 3.6 -1.6 21.0 -24.4 4.8
Entire year 13.2 6.3 40.0 -24.4 69.6
More St. Catharines Weather Records
1882–2024
Highest daily low 26.5 °C July 6, 1993
Lowest daily high -20.6 °C February 8, 1934
Greatest daily range
(Difference of high and low)
30.5 °C March 23, 1979
Greatest difference in daily high
over two conscutive days
23.0 °C Mar 10–11, 1992
Most daily precipitation 7.7 cm September 29, 1924
Most monthly precipitation 23.9 cm September 1977
Most yearly precipitation 107.7 cm 1945
Most yearly days with precipitation 155 2023
Earliest freeze September 30 1991
Earliest day ≥ 25 °C March 22 1938
Earliest day ≥ 30 °C April 25 1990
Earliest day ≥ 35 °C June 5 1925
Latest freeze May 25 1956
Latest day ≥ 25 °C November 5 2022
Latest day ≥ 30 °C October 7 1941
Latest day ≥ 35 °C September 13 1952
Most days in a year < 0 °C 143 1926
Most days in a year ≥ 20 °C 158 1955
Most days in a year ≥ 25 °C 104 1955
Most days in a year ≥ 30 °C 53 1949
Most days in a year ≥ 35 °C 8 1955
Most days in a year ≥ 40 °C 1 1936
St. Catharines Weather Streaks
Most consecutive days...
With precipitation 11 days Feb 6–16, 2015
Without precipitation 99 days Jan 1 – Apr 9, 1995
Freezing temperatures
High temperature ≤ 0 °C
26 days Feb 5 – Mar 2, 2015
High temperature ≥ 20 °C 118 days Jun 7 – Oct 2, 1921
High temperature ≥ 25 °C 70 days Jun 10 – Aug 18, 1949
High temperature ≥ 30 °C 12 days Aug 24 – Sep 4, 1953
High temperature ≥ 35 °C 6 days Jul 8–13, 1936
Plant Hardiness Zone
7A
St. Catharines is in plant hardiness zone 7A
based on average yearly minimum temperature from 1991–2020
St. Catharines Weather by Year
More St. Catharines Weather
Compare St. Catharines to:
Weather Station Details
Years Station Coordinates
1995–2024 Port Weller (AUT) location
1882–1994 St Catherines location