December in Ottawa means embracing true Canadian winter! As the month progresses, temperatures drop, snow accumulates, and the city transforms into a winter wonderland. Here’s what to expect from Ottawa’s December weather and how to prepare for the season.
Understanding Ottawa’s winter climate helps you plan outdoor activities, dress appropriately, and make the most of the season’s offerings—from skating to Christmas markets to holiday light tours.
Key Highlights
TL;DR: December in Ottawa averages -6°C (21°F), with temperatures often dropping below -10°C. Expect 50-60cm of snow for the month. Dress in layers, watch for weather alerts, and embrace winter activities.
| Quick Facts | Details |
|---|---|
| 📅 Month | December 2025 |
| 📍 Location | Ottawa, Ontario |
| 🎟️ Avg Temp | -6°C (21°F) |
| ⏰ Daylight | 8.5 hours (shortest days) |
Typical December Conditions
Temperature Expectations
Ottawa December temperatures follow predictable patterns:
Early December (1-10):
- Daytime highs: -2°C to 2°C
- Overnight lows: -8°C to -5°C
- Transition period from fall
- Variable day-to-day
Mid-December (11-20):
- Daytime highs: -4°C to 0°C
- Overnight lows: -12°C to -8°C
- Winter firmly established
- Consistent cold patterns
Late December (21-31):
- Daytime highs: -6°C to -2°C
- Overnight lows: -15°C to -10°C
- Coldest period begins
- Christmas and New Year weather
Historical Averages
Ottawa December by the numbers:
| Metric | Average |
|---|---|
| Mean Temperature | -6°C (21°F) |
| Average High | -3°C (27°F) |
| Average Low | -11°C (-12°F) |
| Snowfall | 54 cm (21 inches) |
| Snow Days | 12-15 days |
Illustrative image only.
Snow and Precipitation
December Snowfall
What to expect for snow:
- Total monthly snowfall: 50-60 cm typical
- Multiple snow events throughout month
- Accumulation builds through season
- Ice and freezing rain possible during warmer spells
- Snow on ground by mid-December most years
Snow Events
Types of winter weather:
Light Snow:
- 2-5 cm accumulation
- Minor impact on activities
- Common throughout month
Moderate Snowfall:
- 10-15 cm accumulation
- May affect driving/transit
- Several events per month typical
Major Snow Events:
- 20+ cm possible
- Significant disruption potential
- Usually 1-2 per winter month
Planning Around Weather
Outdoor Activities
Weather impacts winter activities:
Skating Rinks:
- Refrigerated rinks open regardless of temperature
- Natural ice needs sustained cold
- Rideau Canal requires extended freeze
- Check conditions before heading out
Christmas Markets:
- Open rain or snow
- Dress warmly for outdoor browsing
- Indoor options for warming up
- May close in extreme conditions
Light Tours:
- Best in clear, cold weather
- Snow enhances displays
- Fog can reduce visibility
- Drive carefully in winter conditions
Dressing for Ottawa Winter
Layering is essential:
Base Layer:
- Moisture-wicking materials
- Long underwear for extended outdoor time
Mid Layer:
- Fleece or wool sweaters
- Insulating properties
Outer Layer:
- Wind and waterproof jacket
- Rated for cold temperatures
Accessories:
- Warm hat covering ears
- Insulated gloves or mittens
- Scarf or neck gaiter
- Warm, waterproof boots
Illustrative image only.
Weather Resources
Forecasts and Alerts
Stay informed with:
- Environment Canada: Official forecasts and warnings
- Weather Network: Detailed local forecasts
- Ottawa City: Road condition updates
- OC Transpo: Transit service alerts
- Mobile apps: Real-time notifications
Weather Alerts to Watch
Types of winter advisories:
Snowfall Warnings:
- Issued for 15+ cm expected
- Plan ahead for travel impacts
Extreme Cold Warnings:
- Issued when windchill reaches -40°C
- Limit outdoor exposure
- Check on vulnerable neighbours
Winter Storm Warnings:
- Combination of snow, wind, cold
- Significant travel impacts expected
- Consider postponing non-essential travel
Freezing Rain Warnings:
- Ice accumulation expected
- Extremely hazardous conditions
- Power outages possible
Driving in December
Winter Driving Conditions
Ottawa roads in December:
- Snow tires required for safety
- Reduced visibility during snow
- Ice possible even on treated roads
- Give extra stopping distance
- Clear snow from vehicle before driving
Road Conditions
Stay informed:
- City of Ottawa plow tracker
- 511 Ontario road conditions
- Allow extra commute time
- Check before heading out
Short Days
December Daylight
Plan around limited light:
| Time | Sunrise | Sunset | Daylight |
|---|---|---|---|
| Dec 1 | 7:15 AM | 4:23 PM | 9 hrs |
| Dec 15 | 7:29 AM | 4:21 PM | 8.5 hrs |
| Dec 21 | 7:35 AM | 4:22 PM | 8.5 hrs |
| Dec 31 | 7:39 AM | 4:29 PM | 8.8 hrs |
Implications
Short days affect:
- Outdoor activity timing
- Light viewing hours
- Energy levels and mood
- Photography opportunities
- Commute visibility
This Week’s Outlook
General Expectations
December 8-14, 2025 outlook:
- Typical December temperatures expected
- Snow chances throughout the week
- Check daily forecasts for updates
- Winter weather alerts possible
Activity Planning
This week consider:
- Indoor backup plans available
- Dress warmly for all outdoor events
- Monitor conditions before driving
- Embrace winter activities safely
Frequently Asked Questions
Q: Will there be a white Christmas in Ottawa? A: Ottawa almost always has snow on the ground for Christmas, with historical probability over 90%. December snowfall typically ensures Christmas snow cover.
Q: When does the Rideau Canal Skateway open? A: The Skateway requires sustained cold temperatures to freeze safely. Opening typically occurs in January, but exact dates depend on winter conditions. Check NCC updates.
Q: Is it safe to drive in Ottawa winters? A: With proper preparation (snow tires, cautious driving, vehicle maintenance), winter driving is manageable. Allow extra time and check conditions before travel.
Q: How cold does Ottawa get in December? A: December temperatures typically range from -15°C to 0°C. With windchill, it can feel much colder. Extreme cold warnings are issued when windchill reaches -40°C.
Q: What should I wear to outdoor events? A: Dress in warm layers, including insulated boots, winter coat, hat, gloves, and scarf. Hand warmers are helpful for extended outdoor time.
Final Thoughts
Ottawa’s December weather is classic Canadian winter—cold, snowy, and perfect for embracing seasonal activities. Rather than fighting the weather, smart Ottawans prepare properly and enjoy everything winter offers.
From skating rinks to Christmas markets to holiday light tours, December’s weather creates the perfect backdrop for festive celebrations. Check forecasts regularly, dress appropriately, and make the most of Ottawa’s winter wonderland.
Stay warm, stay safe, and enjoy the season!
Source: Environment Canada, Historical Ottawa Weather Data - Compiled for Via Ottawa readers.
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