Ontario Weather in December

December in Ontario sees daytime temperatures around 4°C (39°F) and lows of -6°C (21°F) at night. As the wettest month of the year, keep in mind that snow/rainfall is at its highest.

Rainfall in Ontario in December

The month brings the most rain, so be prepared with an umbrella for the occasional shower. You can expect snow/rain on roughly 13 days based on historical data, averaging 45 mm (1.8 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Ontario in December

In December, Ontario gets low temperatures, with highs of 4°C (39°F). Nights cool to around -6°C (21°F). During December, the winter season is in full swing. Time outdoors is usually more comfortable with proper winter clothing and protection from wind. Nights drop below freezing to -6°C (21°F). An extra blanket is worth packing if you're unsure about the heating where you're staying. With the coldest weather of the year, this month demands extra warmth. Be sure to layer up to stay comfortable.

If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Ontario. Our weather planner can help you explore destinations with more pleasant weather conditions.