December weather forecast
Toronto, Canada

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Colorfully lit night city of Toronto, Canada, with a view of the Nathan Phillips Square, and a large Toronto sign
Colorfully lit night city of Toronto, Canada, with a view of the Nathan Phillips Square, and a large Toronto sign

Weather in December

December ushers in the winter season in Toronto, painting the city white with substantial snowfall depths. Coat-clad residents prepare for the holidays amidst a heartwarming, festive vibe. Throughout this month, holiday markets, ice skating rinks, and elaborate light displays attract thousands. Although winter solstice makes it the year's shortest daylight month, the city's holiday spirit keeps it vibrant and lively. Despite the freezing weather, the cheer of season keeps Toronto warm at heart.

Temperature

With December's onset, the average high-temperature in Toronto recedes from November's chilly 7.1°C (44.8°F) to an icy 1.4°C (34.5°F). Night temperatures in December exhibit a subtle decrease, settling at an average of -2.5°C (27.5°F).

Humidity

The average relative humidity in December is 81%.

Rainfall

In December, in Toronto, the rain falls for 7.7 days. Throughout December, 23mm (0.91") of precipitation is accumulated. Throughout the year, there are 136.8 rainfall days, and 420mm (16.54") of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall in Toronto. In Toronto, in December, during 9.9 snowfall days, 41mm (1.61") of snow is typically accumulated. Throughout the year, there are 45.6 snowfall days, and 223mm (8.78") of snow is accumulated.

Sea temperature

In Toronto, in December, the average water temperature is 5°C (41°F).
Note: It is life-risking to swim in 5°C (41°F). Briefly staying in 13°C (55.4°F) waters feels unsettling, and temperatures below 10°C (50°F) might result in cold shock and loss of breath control, hinging on personal endurance.

Daylight

With an average of 9h and 0min of daylight, December has the shortest days of the year.
On the first day of December in Toronto, sunrise is at 7:31 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:50 pm EST.

Sunshine

In Toronto, the average sunshine in December is 3.6h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Toronto. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Updated: Feb 5, 2024 | Published by: Weather Atlas | Resources

Frequently asked questions

How cold is December in Toronto?

Toronto in December has an average high-temperature of 1.4°C (34.5°F) and an average low-temperature of -2.5°C (27.5°F).

What is the average humidity in December in Toronto?

In Toronto, Canada, the average relative humidity in December is 81%.

How many days does it rain in December in Toronto?

In Toronto, Canada, in December, during 7.7 rainfall days, 23mm (0.91") of precipitation is typically accumulated.

How much does it snow in Toronto in December?

In Toronto, Canada, in December, snow falls for 9.9 days, with typically accumulated 41mm (1.61") of snow.

How cold is the water in December in Toronto?

In Toronto, Canada, the average seawater temperature in December is 5°C (41°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the month with the shortest days in Toronto?

December has the shortest days of the year, with an average of 9h and 0min of daylight.

What is the average length of the day in December in Toronto?

The average day length in December in Toronto, Canada, is 9h and 0min.

When are sunrise and sunset in December in Toronto?

In December, on the first day of the month, sunrise is at 7:31 am and sunset at 4:41 pm. On the last day of the month, in Toronto, sunrise is at 7:50 am and sunset at 4:50 pm EST.

How long on average sun shines in December in Toronto?

In December, the average sunshine duration is 3.6h.

What are the months with the lowest UV index in Toronto?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Toronto.

How high is the UV index in December in Toronto?

In Toronto, Canada, the average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Toronto, Canada

Average temperature in December - Toronto, Canada
  • Average high temperature in December: 1.4°C

The warmest month (with the highest average high temperature) is July (24.8°C).
The month with the lowest average high temperature is January (-2.3°C).

  • Average low temperature in December: -2.5°C

The months with the highest average low temperature are July and August (18.4°C).
The coldest month (with the lowest average low temperature) is January (-7°C).

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Average pressure in December
Toronto, Canada

Average pressure in December - Toronto, Canada
  • Average pressure in December: 1017.4mbar

The month with the highest atmospheric pressure is March (1018.4mbar).
The month with the lowest atmospheric pressure is June (1013.1mbar).

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Average wind speed in December
Toronto, Canada

Average wind speed in December - Toronto, Canada
  • Average wind speed in December: 18.8km/h

The windiest month (with the highest average wind speed) is January (19.5km/h).
The calmest month (with the lowest average wind speed) is July (11.7km/h).

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Average humidity in December
Toronto, Canada

Average humidity in December - Toronto, Canada
  • Average humidity in December: 81%

The months with the highest relative humidity are January and February (83%).
The months with the lowest relative humidity are August and September (74%).

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Average rainfall in December
Toronto, Canada

Average rainfall in December - Toronto, Canada
  • Average rainfall in December: 23mm

The wettest month (with the highest rainfall) is July (53mm).
The driest month (with the least rainfall) is February (19mm).

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Average rainfall days in December
Toronto, Canada

Average rainfall days in December - Toronto, Canada
  • Average rainfall days in December: 7.7 days

The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is February (5.6 days).

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Average snowfall in December
Toronto, Canada

Average snowfall in December - Toronto, Canada
  • Average snowfall in December: 41mm

The month with the highest snowfall is January (57mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in December
Toronto, Canada

Average snowfall days in December - Toronto, Canada
  • Average snowfall days in December: 9.9 days

The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Toronto, Canada

Average sea temperature in December - Toronto, Canada
  • Average sea temperature in December: 5°C

The best month for swimming (with the highest average sea temperature) is August (22.3°C).
The coldest month (with the lowest average sea temperature) is March (1.9°C).

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Average daylight in December /
Average sunshine in December
Toronto, Canada

Average daylight in December / Average sunshine in December - Toronto, Canada
  • Average daylight in December: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in December: 3h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).

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Average sunshine days in December
Toronto, Canada

Average sunshine days in December - Toronto, Canada
  • Average sunshine days in December: 14.3 days

The month with the most sunshine days is March (16.2 days).
The month with the least sunshine days is July (12.8 days).

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Average UV index in December
Toronto, Canada

Average UV index in December - Toronto, Canada
  • Average UV index in December: 1

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in December
Toronto, Canada

Average cloud cover in December - Toronto, Canada
  • Average cloud cover in December: 63

The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in December
Toronto, Canada

Average visibility in December - Toronto, Canada
  • Average visibility in December: 9km

The months with the highest visibility are June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, November and December (9km).

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Toronto, Canada

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