Hamilton Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Hamilton, 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 Hamilton, 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 Hamilton temperatures
High °F Low °F   High °C Low °C
30 17 January -1 -9
32 18 February 0 -8
41 25 March 5 -4
53 36 April 12 2
65 46 May 19 8
76 56 June 24 13
81 62 July 27 17
79 60 August 26 16
70 52 September 21 11
58 42 October 15 5
46 33 November 8 0
36 24 December 2 -5
56 39 Year 13 4

Days of Hot Weather in Hamilton

Hamilton usually has 18 days a year with temperatures in the 30s Celsius. Just one of those days, on average reaches above 35 degrees Celsius (95 °F). The 30-degree weather can show up here anytime from May to September, and occasionally as early as April.

Days per month in Hamilton over 10, 20 or 30 °C
  10 °C
50 °F
20 °C
68 °F
30 °C
86 °F
January 1 0 0
February 1 0 0
March 6 1 0
April 16 3 0
May 30 11 1
June 30 24 4
July 31 30 8
August 31 29 5
September 30 17 1
October 25 5 0
November 9 0 0
December 2 0 0
Year 211 120 18

When Hamilton Has Frosty Weather

Hamilton typically has 129 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is April 21. Frost normally returns here on October 15. The frost-free period extends for 177 days on average between the final spring frost and the first fall frost.

Average number of days with freezing temperatures in Hamilton
  0 °C
32 °F
January 28
February 25
March 23
April 9
May 0
June 0
July 0
August 0
September 0
October 3
November 15
December 25
Year 129

How Often Hamilton Has Cold Temperatures

Hamilton's chilliest winter nights have lows in the minus-twenties °C (below -3 °F). The city averages just two nights a year, usually in January and February, when the thermometer drops that low. Temperatures down to -30 °C (-22 °F) are not normal here.

From November to April, it can remain below freezing all day long. Hamilton typically has 49 frosty days a year.

Days per month on average in Hamilton when the minimum temperature drops below -2 or -10 °C
  -2 °C
28 °F
-10 °C
14 °F
January 25 12
February 22 10
March 18 4
April 4 0
May 0 0
June 0 0
July 0 0
August 0 0
September 0 0
October 1 0
November 8 0
December 19 6
Year 97 33
Reference

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

Ontario Temperatures
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