Ottawa
Canada
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
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
December, the first month of the winter, in Ottawa, is also a subzero cold month, with average temperature ranging between min -10.1°C (13.8°F) and max -2.3°C (27.9°F).

Temperature

In December, the average high-temperature decreases, from a cold 5.4°C (41.7°F) in November, to a freezing cold -2.3°C (27.9°F). The average low-temperature, in December, is -10.1°C (13.8°F).

Humidity

With an average relative humidity of 72.2%, December is the most humid month.

Rainfall

In Ottawa, it is raining for 6 days, with typically 33.5mm (1.3") of accumulated precipitation. Throughout the year, in Ottawa, Canada, there are 118.4 rainfall days, and 758.4mm (29.9") of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December.

Daylight

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

Sunshine

December has the least sunshine of the year, with an average of 2.2h of sunshine.

UV index

Months with the lowest UV index are January, 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 the exposure to the Sun's UV radiation for the average person.
The daily maximum UV index of 1 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Ottawa?

In December, in Ottawa, Canada, the average high-temperature is -2.3°C (27.9°F), and the average low-temperature is -10.1°C (13.8°F).

What is the most humid month in Ottawa?

With an average relative humidity of 72.2%, December is the most humid month in Ottawa, Canada.

What is the average humidity in December in Ottawa?

In December, the average relative humidity in Ottawa is 72.2%.

How many days does it rain in December in Ottawa?

In Ottawa, during December, the rain falls for 6 days and regularly aggregates up to 33.5mm (1.3") of precipitation.

How many days does it snow in December in Ottawa?

In Ottawa, Canada, in December, during 14.7 snowfall days, 525mm (20.7") of snow is typically accumulated.

What is the month with the shortest days in Ottawa?

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

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.

What is the month with the least sunshine in Ottawa?

The month with the least sunshine in Ottawa, Canada, is December, with an average of 2.2h of sunshine.

How long on average sun shines in December in Ottawa?

In Ottawa, the average sunshine in December is 2.2h.

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

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

What is the UV index reading in December in Ottawa?

In Ottawa, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the Sun's UV rays.
Average temperature in December - Ottawa, Canada
  • Average high temperature in December: -2.3°C

The warmest month (with the highest average high temperature) is July (26.5°C).
The month with the lowest average high temperature is January (-5.8°C).

  • Average low temperature in December: -10.1°C

The month with the highest average low temperature is July (15.5°C).
The coldest month (with the lowest average low temperature) is January (-14.8°C).

Average humidity in December - Ottawa, Canada
  • Average humidity in December: 72.2%

The month with the highest relative humidity is December (72.2%).
The month with the lowest relative humidity is May (49.9%).

Average rainfall in December - Ottawa, Canada
  • Average rainfall in December: 33.5mm

The wettest month (with the highest rainfall) is June (92.8mm).
The driest month (with the lowest rainfall) is February (18.7mm).

Average rainfall days in December - Ottawa, Canada
  • Average rainfall days in December: 6 days

The month with the highest number of rainy days is October (13.7 days).
The month with the lowest number of rainy days is February (3.9 days).

Average snowfall in December - Ottawa, Canada
  • Average snowfall in December: 525mm

The month with the highest snowfall is January (539mm).
Months with the lowest snowfall are June, July, August and September (0mm).

Average snowfall days in December - Ottawa, Canada
  • Average snowfall days in December: 14.7 days

The month with the highest number of snowfall days is January (16.1 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

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 shortest days is December (Average daylight: 8.8h).

  • Average sunshine in December: 2.2h

The month with most sunshine is July (Average sunshine: 9.7h).
The month with least sunshine is December (Average sunshine: 2.2h).

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

The month with the highest UV index is June (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).