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
The first month of the winter, December, is still a freezing cold month in Ottawa, Canada, with average temperature varying between -10.1°C (13.8°F) and -2.3°C (27.9°F).

Temperature

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

Humidity

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

Rainfall

In December, the rain falls for 6 days. Throughout December, 33.5mm (1.3") of precipitation is accumulated. Throughout the year, in Ottawa, there are 118.4 rainfall days, and 758.4mm (29.9") of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Ottawa, Canada. In Ottawa, snow falls for 14.7 days, with typically accumulated 525mm (20.7") of snow. In Ottawa, during the entire year, snow falls for 63.3 days, and aggregates up to 2234mm (88") of snow.

Daylight

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

Sunshine

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

UV index

Months with the lowest UV index in Ottawa are January, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 1 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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?

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

What is the average humidity in December in Ottawa?

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

How much does it rain in Ottawa in December?

In Ottawa, Canada, in December, it is raining for 6 days, with typically 33.5mm (1.3") of accumulated precipitation.

How much does it snow in Ottawa in December?

In December, it is snowing for 14.7 days. Throughout December, 525mm (20.7") of snow is accumulated.

What is the month with the shortest days in Ottawa?

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

How many hours of daylight does Ottawa have in December?

In December, the average length of the day 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 many hours of sunshine does Ottawa have in December?

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

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

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

What is the UV index intensity in December in Ottawa?

In December, the average daily maximum UV index in Ottawa, Canada, is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the 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).