Temperature in Ontario in December

Daytime highs, nighttime lows and the warmest cities in Ontario, Canada this December.

Ontario, Canada, a region in Canada, experiences maximum daytime temperatures in December ranging from -9°C (16°F) in Red Lake to 4°C (39°F) in Saint Catharines. Nighttime temperatures generally drop to -1°C (30°F) in Saint Catharines and -17°C (1°F) in Red Lake. In December, it is winter.

What is the temperature of the different cities in Ontario, Canada in December?

Discover the typical December temperatures for the most popular locations of Ontario on the map below. Detailed insights are just a click away.

Select a Month

Check the conditions for any month of the year.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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

See also: Ontario weather by month.

Best Places to Visit in Ontario in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Ontario.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in December: blue is cold, red is hot.

See all December weather averages, cities and regions in Ontario

Ontario temperatures in December: frequently asked questions

How hot does it get in Ontario, Canada in December?

Toronto averages a daytime high of 4°C (39°F) in December, which is low for Ontario, Canada.

How cold does it get at night in Ontario, Canada in December?

Average overnight lows in Ontario, Canada during December sit near -3°C (27°F) in Toronto.

What is the warmest city in December in Ontario, Canada?

Based on our systematic data collection, Saint Catharines has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 4°C (39°F), while at night it goes down to an approximate temperature of -1°C (30°F).

What is the coldest city in December in Ontario, Canada?

For the month of December, Red Lake is the most temperate city in Ontario, Canada based on our records. Highs average -9°C (16°F) and nighttime temperatures dip to around -17°C (1°F).

How much sun does Ontario, Canada get in December?

Most cities witness limited sunny days; expect roughly 78 hours of sunlight in Toronto. This subdued sunlight is perfect for those who prefer cooler, cloudier weather rather than intense sunny days.

Interested in more climate information?

We have much more information about the climate in Ontario.

Weather and climate has detailed information for every country in the world. Are you going to Canada? Get detailed historical weather averages for many cities in Canada.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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