Sudbury Weather Records

Sudbury, Ontario weather averages and records from 1887–2024 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in Sudbury, Ontario was 38.3 °C which occurred on July 31, 1975.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in Sudbury, Ontario was -42.8 °C which occurred on February 10, 1888.
Lowest Temperatures: All-Time By Year
Sudbury Weather by Month
Averages based on the years 1991–2020
Month Average (°C) Record (°C) Average (cm)
High ☀️ Low 🌙 High ☀️ Low 🌙 Precipitation 💧 Snow ❄️
January -7.9 -17.6 7.6 -42.8 6.7 66.5
February -5.8 -16.1 9.4 -42.8 5.2 54.7
March 0.4 -10.2 25.9 -41.1 5.8 34.4
April 8.5 -2.2 29.8 -27.8 6.9 19.4
May 17.4 5.3 33.9 -12.8 7.9 2.0
June 22.7 11.1 35.7 -1.6 7.6 0.0
July 24.8 13.3 38.3 1.7 8.4 0.0
August 23.5 12.5 36.7 -1.1 9.3 0.0
September 18.7 8.1 33.9 -5.7 9.4 0.1
October 10.5 1.9 27.3 -15.0 10.0 5.8
November 2.9 -4.4 20.1 -31.7 7.6 31.3
December -4.1 -11.9 14.4 -39.4 6.9 61.1
Entire year 9.4 -0.8 38.3 -42.8 91.8 274.9
More Sudbury Weather Records
1887–2024
Highest daily low 22.7 °C July 2, 2002
Lowest daily high -31.0 °C January 3, 1981
Greatest daily range
(Difference of high and low)
39.4 °C February 9, 1888
Greatest difference in daily high
over two conscutive days
25.0 °C Feb 2–3, 1970
Most daily precipitation 11.2 cm September 3, 1970
Most monthly precipitation 23.6 cm September 1970
Most yearly precipitation 113.1 cm 2014
Most yearly days with precipitation 197 2001
Earliest snow in season September 20 1956
Latest snow in season May 31 2009
Most daily snow 38.8 cm March 10, 1992
Most monthly snow 134.2 cm December 2008
Most yearly snow 426.1 cm 2016
Most snow in a winter 412.6 cm 2018–2019
Greatest snow accumulation 145.0 cm March 17, 1959
Earliest freeze August 30 1976
Earliest day ≥ 20 °C March 18 2012
Earliest day ≥ 25 °C March 21 2012
Earliest day ≥ 30 °C May 3 2010
Earliest day ≥ 35 °C June 19 1995
Latest freeze June 22 1889
Latest day ≥ 20 °C November 9 2020
Latest day ≥ 25 °C October 17 1953
Latest day ≥ 30 °C September 24 2017
Latest day ≥ 35 °C August 19 1955
Most days in a year < 0 °C 196 2002
Most days in a year ≥ 20 °C 126 1921
Most days in a year ≥ 25 °C 72 1921
Most days in a year ≥ 30 °C 24 1919
Most days in a year ≥ 35 °C 8 1921
Sudbury Weather Streaks
Most consecutive days...
With precipitation 17 days Dec 25, 1983 – Jan 10, 1984
Without precipitation 28 days Mar 20 – Apr 16, 1958
With snow 17 days Dec 25, 1983 – Jan 10, 1984
Freezing temperatures
High temperature ≤ 0 °C
85 days Dec 5, 1958 – Feb 27, 1959
High temperature ≥ 20 °C 85 days Jun 18 – Sep 10, 2002
High temperature ≥ 25 °C 36 days Jun 25 – Jul 30, 1921
High temperature ≥ 30 °C 11 days Jun 27 – Jul 7, 1921
High temperature ≥ 35 °C 5 days Jul 3–7, 1921
Plant Hardiness Zone
4A
Sudbury is in plant hardiness zone 4A
based on average yearly minimum temperature from 1991–2020
Sudbury Weather by Year
More Sudbury Weather
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Weather Station Details
Years Station Coordinates
2013–2024 Sudbury A location
1955–2013 Sudbury A location
1887–1954 Sudbury location