December weather forecast
Ottawa, Canada

A view of The Parliament Hill from the Ottawa River in Ottawa, Canada
A view of The Parliament Hill from the Ottawa River in Ottawa, Canada

Weather in December

The first month of the winter, December, is still a freezing cold month in Ottawa, Canada, with average temperature fluctuating between -8.4°C (16.9°F) and -2.7°C (27.1°F).

Temperature

In Ottawa, Canada, the average high-temperature drops, from a cold 4.6°C (40.3°F) in November, to a subzero cold -2.7°C (27.1°F). In December, the average low-temperature is -8.4°C (16.9°F).

Humidity

In Ottawa, the average relative humidity is 87%.

Rainfall

In Ottawa, Canada, in December, it is raining for 8.4 days, with typically 66mm (2.6") of accumulated precipitation. Throughout the year, in Ottawa, Canada, there are 149.6 rainfall days, and 772mm (30.39") of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Ottawa, during 16.6 snowfall days, 198mm (7.8") of snow is typically accumulated. Throughout the year, in Ottawa, there are 83.3 snowfall days, and 1135mm (44.69") of snow is accumulated.

Daylight

The month with the shortest days in Ottawa is December, with an average of 8.8h of daylight.

Sunshine

In December, the average sunshine in Ottawa is 3.3h.

UV index

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Ottawa. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Ottawa?

The average relative humidity in December is 87%.

How much does it rain in Ottawa in December?

In Ottawa, in December, it is raining for 8.4 days, with typically 66mm (2.6") of accumulated precipitation.

How much does it snow in Ottawa in December?

In December, it is snowing for 16.6 days. Throughout December, 198mm (7.8") of snow is accumulated.

What is the month with the shortest days in Ottawa?

With an average of 8.8h of daylight, December has the shortest days of the year in Ottawa, Canada.

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

The average length of the day in December in Ottawa, Canada, is 8.8h.

How long on average sun shines in December in Ottawa?

In December, the average sunshine is 3.3h.

What is the month with the lowest UV index in Ottawa?

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

What is the UV index reading in December in Ottawa?

In December, the average daily maximum UV index is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.

Average temperature in December
Ottawa, Canada

Average temperature in December - Ottawa, Canada
  • Average high temperature in December: -2.7°C

The warmest month (with the highest average high temperature) is July (25.3°C).
The month with the lowest average high temperature is January (-6.3°C).

  • Average low temperature in December: -8.4°C

The month with the highest average low temperature is July (14.5°C).
The coldest month (with the lowest average low temperature) is January (-14.5°C).

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Average pressure in December
Ottawa, Canada

Average pressure in December - Ottawa, Canada
  • Average pressure in December: 1017.3mbar

The month with the highest atmospheric pressure is March (1018mbar).
The month with the lowest atmospheric pressure is June (1012.5mbar).

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Average wind speed in December
Ottawa, Canada

Average wind speed in December - Ottawa, Canada
  • Average wind speed in December: 13km/h

The windiest month (with the highest average wind speed) is April (14km/h).
The calmest month (with the lowest average wind speed) is July (9.8km/h).

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Average humidity in December
Ottawa, Canada

Average humidity in December - Ottawa, Canada
  • Average humidity in December: 87%

Months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is May (77%).

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Average rainfall in December
Ottawa, Canada

Average rainfall in December - Ottawa, Canada
  • Average rainfall in December: 66mm

The wettest month (with the highest rainfall) is October (78mm).
The driest month (with the least rainfall) is September (54mm).

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Average rainfall days in December
Ottawa, Canada

Average rainfall days in December - Ottawa, Canada
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (5.9 days).

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Average snowfall in December
Ottawa, Canada

Average snowfall in December - Ottawa, Canada
  • Average snowfall in December: 198mm

The month with the highest snowfall is January (321mm).
Months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in December
Ottawa, Canada

Average snowfall days in December - Ottawa, Canada
  • Average snowfall days in December: 16.6 days

The month with the highest number of snowfall days is January (19.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Ottawa, Canada
  • Average daylight in December: 8.8h

The month with the longest days is June (Average daylight: 15.6h).
The month with the shortest days is December (Average daylight: 8.8h).

  • Average sunshine in December: 3.3h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 2.8h).

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Average sunshine days in December
Ottawa, Canada

Average sunshine days in December - Ottawa, Canada
  • Average sunshine days in December: 10.7 days

The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (9.1 days).

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Average UV index in December
Ottawa, Canada

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

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in December
Ottawa, Canada

Average cloud cover in December - Ottawa, Canada
  • Average cloud cover in December: 65

Months with the most cloud cover are January and February (Cloud cover 69).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in December
Ottawa, Canada

Average visibility in December - Ottawa, Canada
  • Average visibility in December: 8km

Months with the highest visibility are April, May, June, July, August and October (9km).
Months with the lowest visibility are January and February (7km).

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