Oshawa Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Oshawa, 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 Oshawa, 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 Oshawa temperatures
High °F Low °F   High °C Low °C
30 17 January -1 -8
32 19 February 0 -7
40 26 March 4 -4
51 36 April 11 2
62 46 May 17 8
72 55 June 22 13
77 61 July 25 16
76 60 August 24 16
68 53 September 20 12
56 42 October 13 6
45 34 November 7 1
36 24 December 2 -4
54 39 Year 12 4

Days of Hot Weather in Oshawa

The hottest days at Oshawa usually have temperatures peaking in the low-thirties Celsius. The city averages four 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 every four years.

Days per month in Oshawa 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 3 0 0
April 16 1 0
May 29 7 0
June 30 20 1
July 31 29 2
August 31 28 1
September 30 14 0
October 23 1 0
November 8 0 0
December 1 0 0
Year 203 100 4

When Oshawa Has Frosty Weather

Oshawa typically has 126 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is April 29. Frost normally returns here on October 13. The frost-free period extends for 168 days on average between the final spring frost and the first fall frost.

Average number of days with freezing temperatures in Oshawa
  0 °C
32 °F
January 28
February 25
March 23
April 9
May 1
June 0
July 0
August 0
September 0
October 3
November 13
December 24
Year 126

How Often Oshawa Has Cold Temperatures

Oshawa's chilliest winter nights have lows in the minus-twenties °C (below -3 °F). The city averages just three nights a year, mainly in January, when the thermometer drops that low. Temperatures below -30 °C (-22 °F) do happen here, but are rare events.

From November to April, Oshawa can remain below freezing all day long. The city typically has 64 days a year when the temperature never rises above 0 °C.

Days per month on average in Oshawa when the minimum temperature drops below -2, -10, or -20 °C
  -2 °C
28 °F
-10 °C
14 °F
-20 °C
-4 °F
January 23 11 2
February 21 9 0
March 17 4 0
April 3 0 0
May 0 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 0
November 6 0 0
December 18 5 0
Year 88 29 3
Reference

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

Ontario Temperatures
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