Ottawa weather in December 2025

Expect daytime maximum temperatures of -4°C in Ottawa, Ontario in December based on long-term weather averages. There are 3 hours of sunshine per day on average with 16 days with some rainfall and typically 82 mm of rainfall in the month, which might fall as snow.

  • -4°C maximum daytime temperature in December in Ottawa-4
    -4°C max day temperature
  • 3 hours of sunshine per day
  • 16 days with some rainfall in December in Ottawa16
    16 days with some rainfall
  • -11°C minimum night-time temperature in December in Ottawa-11
    -11°C min night temperature
  • 9 hours of daylight per day in December in Ottawa9
    9 hours of daylight per day
  • No heat & humidity in December in Ottawa0
    No heat & humidity
  • 82 mm monthly rainfall in December in Ottawa82
    82 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Ottawa1
    1 (Low) UV index

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The December weather guide for Ontario (Ottawa) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Ontario

How cold is it in Ottawa in December?

Daytime temperatures usually reach -4°C in Ottawa in December, falling to -11°C at night.

How sunny is it in Ottawa in December?

There are normally 3 hours of bright sunshine each day in Ottawa in December - that's 28% of daylight hours.

Does it rain in Ottawa in December?

There are usually 16 days with some rain in Ottawa in December and the average monthly rainfall is 82mm. Rain may fall as snow in this month.

Ottawa December sunrise & sunset times

Browse the sunrise and sunset times for Ottawa in December 2025. Select a month to view Ottawa sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:22 16:21
Tuesday, 16th December 2025 07:37 16:21
Wednesday, 31st December 2025 07:43 16:30

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