Ontario Weather in December

December in Ontario sees daytime temperatures around 19°C (66°F) and lows of 6°C (43°F) at night. As the wettest month of the year, keep in mind that rainfall is at its highest.

Rainfall in Ontario in December

Being the wettest month, having an umbrella on standby can help you avoid getting caught in the rain. Climate statistics over the past 30 years suggest around 8 days of rain, with 78 mm (3.1 in) average for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Ontario in December

December in Ontario brings typical temperatures with highs around 19°C (66°F) and lows of 6°C (43°F). During December, you'll experience the winter season. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 6°C (43°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. Experience the year's lowest temperatures this month, but they are still mild and pleasant.

Sunshine in Ontario in December

With approximately 205 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

Should you favor a climate that's both dry and comfortably warm, January, February, March, April, May, October and November typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Ontario's climate page.

Ontario Temperature in December

Min Temperature 6°C (43°F)  

Max Temperature 19°C (66°F)  

Chance of Rain 26%  

Precipitation 78 mm (3.1 in)  

Rainy days 8 days  

Sunshine 205 hours *  

Percentage Sunshine *  

* Data from: Corona, the United States of America (22 KM, 13 Miles).

What to Wear in Ontario in December

Pleasant temperatures in December mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Ontario in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Camping

4/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Ontario's climate page.

More climate data for Ontario

Temperature Rainfall Sunshine

See the full Ontario climate overview or explore weather in the United States of America.