ClimateForecastDecemberJanuary >>

Weather in December in Ontario

Are you planning a trip a to Ontario in December and wondering what kind of weather to expect? This page has all the details you need.

What is the weather like in Ontario in December?

Ontario is a region in Canada. Ontario has a wide variety of climate types. During December, you can expect temperatures that range from very cold to cold and precipitation levels ranging from moderate to high. During December, winter is in full swing.

Temperatures

The average highest temperatures fluctuate between very cold in Red Lake at -9°C to cold in Saint Catharines at 4°C. Nighttime temperatures generally drop to -1°C in Saint Catharines and -17°C in Red Lake. In many areas in Canada, December brings with it chilling temperatures. When visiting these parts during this time, it's of utmost importance to be ready. Choose clothing that is both layered and insulating to combat the cold effectively.

Precipitation

In December, precipitation varies across different areas. From moderate snowfall in Red Lake with an average of 31 mm to high snowfall in Rockport with 110 mm.

Average sunshine

Most areas see fewer sunny days, with a projection of about 78 hours of sunshine in Toronto. This reduced sunlight makes it ideal for those who prefer dimmer, overcast conditions over bright sunny days.

To learn more about the conditions in specific areas of Ontario in December, check out the map below. For more details on the yearly weather, visit our Ontario climate page.

Where to go in Ontario in December

Find more information for the most popular destinations in the Ontario on the map below. Click on a destination dot for more detailes.

Map not visible? Whoops sorry! Please refresh the page.
Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Popular destinations

What is the weather like in December for the 5 most popular destinations in Ontario?

Toronto

In December Toronto generally has low temperatures with maximum daytime temperatures around 4°C, minimum nighttime temperatures around -3°C and moderate monthly snow/rainfall. So on average the conditions are poor that month.

Toronto
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly snow/rainfall precipitationSnow/rainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
9°C 
2°C 
88 hours 
87 mm 
12 days 
poor 
4°C 
-3°C 
78 hours 
83 mm 
13 days 
poor 
January   >> January
>>  
1°C 
-7°C 
85 hours 
84 mm 
12 days 
poor 
Climate in Toronto

Ottawa

In December Ottawa generally has very low temperatures with maximum daytime temperatures around -0°C, minimum nighttime temperatures around -9°C and moderate monthly snowfall. So on average the conditions are poor that month.

Ottawa
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly snowfall precipitationSnowfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
7°C 
-2°C 
85 hours 
87 mm 
14 days 
poor 
-0°C 
-9°C 
83 hours 
85 mm 
16 days 
poor 
January   >> January
>>  
-4°C 
-15°C 
98 hours 
79 mm 
14 days 
poor 
Climate in Ottawa

Niagara Falls

In December Niagara Falls generally has low temperatures with maximum daytime temperatures around 4°C, minimum nighttime temperatures around -3°C and moderate monthly snow/rainfall. So on average the conditions are poor that month.

Niagara Falls
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly snow/rainfall precipitationSnow/rainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
9°C 
1°C 
82 hours 
60 mm 
12 days 
poor 
4°C 
-3°C 
68 hours 
93 mm 
16 days 
poor 
January   >> January
>>  
0°C 
-7°C 
93 hours 
68 mm 
19 days 
poor 
Climate in Niagara Falls

Mississauga

In December Mississauga generally has low temperatures with maximum daytime temperatures around 3°C, minimum nighttime temperatures around -3°C and moderate monthly snow/rainfall. So on average the conditions are poor that month.

Mississauga
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly snow/rainfall precipitationSnow/rainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
9°C 
1°C 
96 hours 
81 mm 
11 days 
poor 
3°C 
-3°C 
88 hours 
76 mm 
12 days 
poor 
January   >> January
>>  
0°C 
-8°C 
78 hours 
77 mm 
11 days 
poor 
Climate in Mississauga

Niagara on the Lake

In December Niagara on the Lake generally has low temperatures with maximum daytime temperatures around 3°C, minimum nighttime temperatures around -2°C and moderate monthly snow/rainfall. So on average the conditions are poor that month.

Niagara on the Lake
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly snow/rainfall precipitationSnow/rainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
7°C 
1°C 
82 hours 
41 mm 
9 days 
poor 
3°C 
-2°C 
68 hours 
57 mm 
10 days 
poor 
January   >> January
>>  
1°C 
-5°C 
93 hours 
42 mm 
13 days 
poor 
Climate in Niagara on the Lake

Is your destination not in the list? Have a look at other destinations in Ontario, in Canada.

Is December the best time to visit Ontario?

In our opinion, December may not be the ideal time to visit Ontario due to the typically poor weather in Toronto.

Generally speaking, the best visiting conditions can be found in June, July, August and September offering mostly perfect weather in Toronto. In contrast, January, February, March, April, November and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Ontario. Interested in the weather conditions in a specific month? Select the month below.

  • January      
  • February      
  • March      
  • April      
  • May      
  • June      
  • July      
  • August      
  • September      
  • October      
  • November      
  • December      
  • 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.