WEATHER IN Thunder Bay
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Climate tables. Data for Thunder Bay.
Monthly temperature
| Month | Record low | Average low | Average | Average high | Record high |
| january | -43.2 (1996) | -20.9 | -15.1 | -9.2 | 9.4 (2006) |
| february | -40.6 (1996) | -18.8 | -12.3 | -5.8 | 15.5 (2000) |
| march | -36.7 (1943) | -13.0 | -6.7 | -0.4 | 23.8 (2010) |
| april | -22.2 (1954) | -4.0 | 2.4 | 8.8 | 28.3 (1942) |
| may | -8.9 (1958) | 2.2 | 9.2 | 16.2 | 35.2 (1986) |
| june | -2.8 (1949) | 7.4 | 14.3 | 21.1 | 39.0 (1995) |
| july | 0.0 (1969) | 11.2 | 17.9 | 24.7 | 37.2 (1975) |
| august | -1.1 (1976) | 10.1 | 17.1 | 24.0 | 40.3 (1983) |
| september | -8.3 (1942) | 5.2 | 11.8 | 18.4 | 34.1 (2005) |
| october | -13.3 (1981) | -0.9 | 4.6 | 10.1 | 28.3 (1943) |
| november | -30.6 (1976) | -7.7 | -3.0 | 1.7 | 21.7 (1975) |
| december | -39.8 (2013) | -15.2 | -10.2 | -5.2 | 12.2 (1962) |
| year | () | () |
Monthly precipitation
| Month | Average | Record low | Record high | Daily high |
| january | 23 | 0.0 (2020) | 143 (1956) | 52 (1956) |
| february | 17 | 0.0 (2020) | 81 (1951) | 34 (1951) |
| march | 28 | 0.0 (2020) | 103 (1979) | 42 (1957) |
| april | 47 | 0.0 (2020) | 188 (2001) | 117 (2003) |
| may | 64 | 4 (1996) | 174 (1971) | 76 (1971) |
| june | 78 | 5 (1996) | 220 (2016) | 84 (2016) |
| july | 78 | 3 (1995) | 203 (1993) | 96 (1997) |
| august | 73 | 9 (2007) | 170 (1988) | 87 (1973) |
| september | 65 | 11 (1995) | 284 (1977) | 131 (1977) |
| october | 59 | 0.0 (2019) | 167 (1970) | 51 (2010) |
| november | 49 | 0.0 (2019) | 129 (1958) | 63 (1973) |
| december | 30 | 0.0 (1994) | 106 (1948) | 73 (1998) |
| year | () | () | () |
Number of days with solid, liquid, and mixed precipitation
| Type of precipitation | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Wind speed, m/s
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
The frequency of different wind directions, %
| direction | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Air humidity, %
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Snow cover
| Month | jul | aug | sep | oct | nov | dec | jan | feb | mar | apr | may | jun | Year |
| number of days | |||||||||||||
| height (sm) | |||||||||||||
| max height (sm) |
Cloudy, score
| month | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
| total | |||||||||||||
| low |
Number of clear, cloudy and cloudy days
| month | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
| Total cloud | |||||||||||||
| Low cloud | |||||||||||||
Number of days with different phenomena
| phenomenon | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
The frequency of different types of clouds, %
| type of clouds | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |