Guelph Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Guelph, 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 Guelph, 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 Guelph temperatures
High °F Low °F   High °C Low °C
27 13 January -3 -11
28 13 February -2 -10
38 21 March 3 -6
52 33 April 11 1
65 43 May 18 6
74 51 June 23 11
79 57 July 26 14
76 55 August 24 13
68 47 September 20 8
56 37 October 13 3
43 30 November 6 -1
32 19 December 0 -7
53 35 Year 12 2

Days of Hot Weather in Guelph

The hottest days at Guelph usually have temperatures peaking in the low-thirties Celsius. The city averages seven days a year with thirty-degree weather, which can show up from May to September. Temperatures above 35 °C (95 °F), happen on an average of three days a decade.

Days per month in Guelph above 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 5 0 0
April 17 3 0
May 29 11 0
June 30 23 1
July 31 29 3
August 31 28 2
September 29 15 0
October 23 3 0
November 7 0 0
December 1 0 0
Year 204 113 7

When Guelph Has Frosty Weather

Guelph typically has 160 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is May 18. Frost normally returns here on September 22. The frost-free period extends for 125 days on average between the final spring frost and the first fall frost.

Average number of days with freezing temperatures in Guelph
  0 °C
32 °F
January 30
February 26
March 26
April 14
May 4
June 0
July 0
August 0
September 2
October 10
November 19
December 28
Year 160

How Often Guelph Has Cold Temperatures

Guelph's chilliest winter nights have lows in the minus-twenties °C (below -3 °F). The city averages eight nights a year, usually in January and February, when the thermometer drops that low. Temperatures below -30 °C (-22 °F) happen about once every two or three years.

From November to April, Guelph can remain below freezing all day long. The city typically has 66 days a year when the temperature never rises above 0 °C.

Days per month on average in Guelph when the minimum temperature drops below -2, -10, or -20 °C
  -2 °C
28 °F
-10 °C
14 °F
-20 °C
-4 °F
January 28 16 4
February 24 15 3
March 22 8 1
April 9 0 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 13 1 0
December 23 8 1
Year 126 48 8
Reference

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

Ontario Temperatures
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