January weather forecast
Thunder Bay, Canada

In Thunder Bay, Canada, January is the coldest month of the year. The temperature reaches as low as -20.6°C (-5.1°F) and it rarely rises above -8°C (17.6°F). The city also experiences its highest snowfall in this month, with an average of 365mm (14.37") of snow covering the ground. It is also one of the darkest months, with few hours of daylight and sunshine. The harsh winter conditions make indoor activities more popular in January.

Temperature

January is the coldest month, with the temperature often reaching an average high of -8°C (17.6°F) and an average low of -20.6°C (-5.1°F).

Rainfall

The month with the least rainfall is January, when the rain falls for 0.6 days and typically collects 0mm (0") of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Thunder Bay, in January, snow falls for 12.9 days, with typically accumulated 365mm (14.37") of snow. In Thunder Bay, during the entire year, snow falls for 62.7 days and aggregates up to 1631mm (64.21") of snow.

Sea temperature

January through April, with an average sea temperature of 2°C (35.6°F), are months with the coldest seawater.
Note: In the context of swimming, this situation is viewed as life-threatening and poses serious risks. The sensation of cold is painfully acute, leading to rapid hyperventilation. Using a specialized swimsuit is imperative to decrease thermal injury.

Daylight

In Thunder Bay, the average length of the day in January is 8h and 52min.
On the first day of January in Thunder Bay, sunrise is at 8:48 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 8:27 am and sunset at 5:53 pm EST.

Sunshine

In Thunder Bay, the average sunshine in January is 3.5h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index of 1 during January leads to these instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.