Sudbury Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Sudbury, Ontario during each month of the year.

The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 10, 20 or 30 °C each month in Sudbury, scroll down farther. There are also monthly and yearly counts of days with frost and cold weather.

All the numbers are long-term historical averages based on climate data gathered from 1981 to 2010.

Average Sudbury temperatures
High °F Low °F   High °C Low °C
18 0 January -8 -18
22 3 February -6 -16
33 14 March 0 -10
49 29 April 9 -2
63 41 May 17 5
72 51 June 22 11
77 56 July 25 13
74 54 August 23 12
64 46 September 18 8
51 35 October 10 2
37 24 November 3 -5
24 9 December -4 -13
49 30 Year 9 -1

Days of Hot Weather in Sudbury

The hottest days at Sudbury usually have temperatures peaking in the low-thirties Celsius. The city averages six days a year with thirty-degree weather, which can show up from May to September. The temperature does climb over 35 °C (95 °F), but that's quite uncommon, happening on average just once or twice a decade.

Days per month in Sudbury over 10, 20 or 30 °C
  10 °C
50 °F
20 °C
68 °F
30 °C
86 °F
January 0 0 0
February 0 0 0
March 2 0 0
April 13 2 0
May 27 9 0
June 30 20 2
July 31 28 3
August 31 25 1
September 28 11 0
October 15 1 0
November 3 0 0
December 0 0 0
Year 180 96 6

When Sudbury Has Frosty Weather

Sudbury typically has 178 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is May 17. Frost normally returns here on October 1. The frost-free period extends for 136 days on average between the final spring frost and the first fall frost.

Average number of days with freezing temperatures in Sudbury
  0 °C
32 °F
January 31
February 28
March 29
April 19
May 4
June 0
July 0
August 0
September 1
October 12
November 25
December 30
Year 178

How Often Sudbury Has Cold Temperatures

Sudbury's chilliest winter nights have lows below -30 °C (-22 °F). The city averages three nights a year, mainly in January, when the temperature gets that cold.

From October to April, Sudbury can remain below freezing all day long. The city typically has 100 days a year when the temperature never rises above 0 °C.

Days per month on average in Sudbury when the minimum temperature drops below -2, -10, or -20 °C
  -2 °C
28 °F
-10 °C
14 °F
-20 °C
-4 °F
January 30 25 13
February 27 22 9
March 27 15 3
April 13 1 0
May 1 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 5 0 0
November 19 5 0
December 28 19 6
Year 151 88 32
Reference

Environment Canada. Meteorological Service of Canada. Canadian Climate Normals. 1981-2010 Climate Normals & Averages.

Ontario Temperatures
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