Ottawa weather in December
December in Ottawa: cold, rainy, with clean air — a hit-or-miss time to visit.
#10 of 12 months in Ottawa · #829 of 897 destinations to visit in December · comfort 40/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ottawa in December
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Ottawa climate normals — December
| Daytime high | 1°C / 34°F | 🧥 cold |
|---|---|---|
| Nighttime low | -5°C / 23°F | |
| Rainfall | 95 mm / 3.7 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | -5°C / 24°F | |
| Sunshine | 3.5 h/day | |
| Daylight | 8.8 h | |
| Wind | 17 km/h / 11 mph | |
| Snowfall | 31.9 cm / 12.6 in | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Ottawa in December — FAQ
- Is December a good time to visit Ottawa?
- December in Ottawa: cold, rainy, with clean air — a hit-or-miss time to visit. It ranks #10 of 12 months for Ottawa on SeasonMap's comfort score (40/100).
- What is the weather like in Ottawa in December?
- In December, Ottawa averages a daily high of 1.1°C and a low of -4.9°C, with about 94.6 mm of rain over roughly 12.6 rainy days.
- What is the air quality in Ottawa in December?
- Ottawa has a mean US Air Quality Index of about 35 in December.
- Does it snow in Ottawa in December?
- Ottawa sees roughly 31.9 cm of snowfall in December.