St. Catharines Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in St. Catharines, 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 St. Catharines, 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 at the Niagara District Airport.

Average St. Catharines temperatures
High °F Low °F   High °C Low °C
32 19 January 0 -7
34 20 February 1 -7
42 26 March 5 -3
54 36 April 12 2
67 46 May 19 8
76 56 June 24 13
81 62 July 27 17
78 60 August 26 16
71 53 September 22 12
59 42 October 15 6
47 34 November 8 1
37 24 December 3 -4
56 40 Year 14 4

Days of Hot Weather in St. Catharines

The hottest days at St. Catharines usually have temperatures peaking in the low-thirties Celsius. The city averages 14 days a year with thirty-degree weather, which can show up from April to September. The temperature does climb above 35 °C (95 °F) on an average of one day in two or three years.

Days per month in St. Catharines over 10, 20 or 30 °C
  10 °C
50 °F
20 °C
68 °F
30 °C
86 °F
January 1 0 0
February 2 0 0
March 7 1 0
April 19 3 0
May 30 13 1
June 30 26 3
July 31 30 7
August 31 30 3
September 30 18 1
October 26 5 0
November 10 1 0
December 3 0 0
Year 219 127 14

When St. Catharines Has Frosty Weather

St. Catharines typically has 127 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is April 24. Frost normally returns here on October 21. The frost-free period extends for 179 days on average between the final spring frost and the first fall frost.

Average number of days with freezing temperatures in St. Catharines
  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 14
December 25
Year 127

How Often St. Catharines Has Cold Temperatures

The chilliest winter nights at St. Catharines have lows in the minus-twenties °C (below -3 °F). But the city averages only one night a year, usually in January, when it gets that cold. Temperatures down to -30 °C (-22 °F) are not normal here.

From November to April, St. Catharines 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 St. Catharines when the minimum temperature drops below -2 or -10 °C
  -2 °C
28 °F
-10 °C
14 °F
January 25 10
February 22 8
March 18 3
April 3 0
May 0 0
June 0 0
July 0 0
August 0 0
September 0 0
October 1 0
November 7 0
December 19 4
Year 94 27
Reference

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

Ontario Temperatures
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