Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Onset of December in Ottawa comes with a temperature decline, the average high falling from a wintry 4.6°C (40.3°F) in November to a subzero cold -2.7°C (27.1°F). Throughout December, Ottawa experiences a low-temperature average of -8.4°C (16.9°F).Humidity
The average relative humidity in December is 87%.Rainfall
In December, in Ottawa, the rain falls for 8.4 days. Throughout December, 66mm (2.6") of precipitation is accumulated. In Ottawa, Canada, during the entire year, the rain falls for 149.6 days and collects up to 772mm (30.39") of precipitation.Snowfall
Months with snowfall in Ottawa are January through May, October through December. In Ottawa, in December, snow falls for 16.6 days, with typically accumulated 198mm (7.8") of snow. Throughout the year, in Ottawa, there are 83.3 snowfall days, and 1135mm (44.69") of snow is accumulated.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year in Ottawa.On the first day of the month, sunrise is at 7:22 am and sunset at 4:21 pm. On the last day of December, sunrise is at 7:42 am and sunset at 4:29 pm EST.
Sunshine
In Ottawa, the average sunshine in December is 3.3h.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 low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 1 in December interprets into the following advice:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Frequently asked questions
How cold is it in Ottawa in December?
What is the average humidity in December in Ottawa?
How much does it rain in Ottawa in December?
How much does it snow in Ottawa in December?
What is the month with the shortest days in Ottawa?
What is the average length of the day in December in Ottawa?
When are sunrise and sunset in December in Ottawa?
How long on average sun shines in December in Ottawa?
What are the months with the lowest UV index in Ottawa?
What is the UV index intensity in December in Ottawa?
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).
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).
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).
Average humidity in December
Ottawa, Canada
- Average humidity in December: 87%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is May (77%).
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).
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).
Average snowfall in December
Ottawa, Canada
- Average snowfall in December: 198mm
The month with the highest snowfall is January (321mm).
The months with the least snowfall are June, July, August and September (0mm).
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).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Ottawa, Canada
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
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).
Average UV index in December
Ottawa, Canada
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Ottawa, Canada
- Average cloud cover in December: 65
The 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).
Average visibility in December
Ottawa, Canada
- Average visibility in December: 8km
The months with the highest visibility are April, May, June, July, August and October (9km).
The months with the lowest visibility are January and February (7km).
Ottawa, Canada
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