Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average UV index in December
Weather in December
Temperature
December's arrival in Thunder Bay comes with a decrease in the average high-temperature, moving from a cold 1.4°C (34.5°F) in November to a freezing cold -5.5°C (22.1°F). Thunder Bay, in December, observes a steady average low-temperature of -16°C (3.2°F).Rainfall
In Thunder Bay, Canada, in December, it is raining for 1.2 days, with typically 6mm (0.24") of accumulated precipitation. In Thunder Bay, during the entire year, the rain falls for 92.6 days and collects up to 547mm (21.54") of precipitation.Snowfall
January through May, September through December are months with snowfall in Thunder Bay. December is the month with the most snowfall. Snow falls for 13.9 days and accumulates 389mm (15.31") of snow.Sea temperature
In December, the average sea temperature is 4°C (39.2°F).Note: When swimming, this is deemed life-endangering and extremely risky. The painful cold water instigates fast-paced hyperventilation. Wearing a specialized swimsuit is necessary to lessen thermal harm.
Daylight
With an average of 8h and 24min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 8:28 am and sunset at 5:04 pm. On the last day of December, sunrise is at 8:48 am and sunset at 5:12 pm EST.
Sunshine
November and December, with an average of 2.9h of sunshine, are months with the least sunshine.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 reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high UV index of 1 in December translates into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is it in Thunder Bay in December?
How much does it rain in Thunder Bay in December?
When does it snow the most in Thunder Bay?
How much does it snow in Thunder Bay in December?
What is the sea temperature in December in Thunder Bay?
What is the month with the shortest days in Thunder Bay?
How many hours of daylight does Thunder Bay have in December?
When are sunrise and sunset in December in Thunder Bay?
What is the month with the least sunshine in Thunder Bay?
How many hours of sunshine does Thunder Bay have in December?
When is the lowest UV index in Thunder Bay?
How high is the UV index in December in Thunder Bay?
Average temperature in December
Thunder Bay, Canada
- Average high temperature in December: -5.5°C
The warmest month (with the highest average high temperature) is July (24.3°C).
The month with the lowest average high temperature is January (-8°C).
- Average low temperature in December: -16°C
The month with the highest average low temperature is July (11.1°C).
The coldest month (with the lowest average low temperature) is January (-20.6°C).
Average rainfall in December
Thunder Bay, Canada
- Average rainfall in December: 6.2mm
The wettest month (with the highest rainfall) is August (89.5mm).
The driest month (with the least rainfall) is January (0.4mm).
Average rainfall days in December
Thunder Bay, Canada
- Average rainfall days in December: 1.2 days
The month with the highest number of rainy days is June (13.8 days).
The month with the least rainy days is January (0.6 days).
Average snowfall in December
Thunder Bay, Canada
- Average snowfall in December: 389mm
The month with the highest snowfall is December (389mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in December
Thunder Bay, Canada
- Average snowfall days in December: 13.9 days
The month with the highest number of snowfall days is December (13.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average sea temperature in December
Thunder Bay, Canada
- Average sea temperature in December: 4°C
The best months for swimming (with the highest average sea temperature) are August and September (13°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (2°C).
Average daylight in December /
Average sunshine in December
Thunder Bay, Canada
- Average daylight in December: 8h and 2min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in December: 2h and 5min
The month with the most sunshine is June (Average sunshine: 8h and 42min).
The months with the least sunshine are November and December (Average sunshine: 2h and 54min).
Average UV index in December
Thunder Bay, Canada
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 1).
Thunder Bay, Canada
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