When Thunder Bay Has Frosty Weather
By Graham Saunders, Wilderness North Meteorologist
For the last 60 days our winter has been surprisingly cold and snowy. In 1956, the record low temperatures and snowfall set an all-time weather statics record. While neither January or February reached those record setting numbers. They really came close.
March is finally here and our back-to-back exposure to Alberta Clippers” will probably be broken and with our sun higher in the sky our temperatures should moderate to average levels.
Thunder Bay typically has 203 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is May 30. Frost normally returns here on September 19. The frost-free period extends for 111 days on average between the final spring frost and the first fall frost.
Average number of days with freezing temperatures in Thunder Bay | ||
0 °C | ||
32 °F | ||
January | 31 | |
February | 28 | |
March | 29 | |
April | 23 | |
May | 11 | |
June | 0 | |
July | 0 | |
August | 0 | |
September | 4 | |
October | 19 | |
November | 28 | |
December | 30 | |
Year | 203 |
How Often Thunder Bay Has Cold Temperatures
Thunder Bay’s chilliest winter nights have lows below -30 °C (-22 °F). The city averages eight nights a year, mainly in January and February, when the temperature gets that cold.
From October to April, Thunder Bay can remain below freezing all day long. The city typically has 96 days a year during which the temperature never rises above 0 °C.
-2 °C | -10 °C | -20 °C | |
28 °F | 14 °F | -4 °F | |
January | 30 | 27 | 17 |
February | 27 | 21 | 12 |
March | 28 | 14 | 4 |
April | 18 | 2 | 0 |
May | 5 | 0 | 0 |
June | 0 | 0 | 0 |
July | 0 | 0 | 0 |
August | 0 | 0 | 0 |
September | 2 | 0 | 0 |
October | 13 | 0 | 0 |
November | 24 | 10 | 1 |
December | 29 | 23 | 11 |
Year | 175 | 98 | 45 |
Thunder Bay Weather