Thousand Islands National Park Weather in December

Average temperatures, rainfall, sunshine and the best places to visit in Thousand Islands National Park, Canada in December.

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Thinking about venturing to Thousand Islands National Park, Canada this December and curious about the weather conditions to expect? This page holds all the key information you seek, responding to your question:

What to Expect in Thousand Islands National Park in December

Thousand Islands National Park, Canada is a region in Canada. December in Thousand Islands National Park generally has very cold temperatures, with high precipitation. It's the height of winter.

Temperatures

You can expect very cold maximum daytime temperatures of around 1°C (34°F) and nighttime temperatures around -6°C (21°F) in Brockville. In numerous regions in Canada, December is marked by its cold weather conditions. If you're heading to these areas during this month, it's vital to be well-prepared. Dressing in layered and insulated outfits will ensure you stay warm.

To learn more about the conditions in specific areas of Thousand Islands National Park, Canada, check out the map below.

Precipitation

December is a rainy month with an average snow/rainfall of around 107 mm (4.2 in) in Brockville.

Average sunshine

Sunshine hours are generally lower in most areas during December. Brockville experiences about 75 hours of sunlight. If you're looking for brighter destinations, our weather planner can suggest better options.

Explore Thousand Islands National Park by month

Pick a month to see the average temperature, rainfall and sunshine in Thousand Islands National Park — and find the best time to visit. (based on Brockville)

Best Places to Visit in Thousand Islands National Park in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Thousand Islands National Park.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Thousand Islands National Park

What is the weather like in December for the most popular destinonation in Thousand Islands National Park, Canada?

Brockville

In December Brockville generally has very low temperatures with maximum daytime temperatures around 1°C (34°F), minimum nighttime temperatures around -6°C (21°F) and high monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
8°C (46°F)
1°C (34°F)
-2°C (28°F)
Min temperature
0°C (32°F)
-6°C (21°F)
-11°C (12°F)
Monthly sun hours
91 hours
75 hours
93 hours
Monthly snow/rainfall
69 mm (2.7 in)
107 mm (4.2 in)
72 mm (2.8 in)
Monthly rainy days
12 days
19 days
16 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Thousand Islands National Park, in Canada.

In our records: Canada December extremes

Notable December records observed across cities in Canada in our climate database (1976 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • Based on our data, the coldest December night in Canada dropped to -51°C (-60°F) in Mayo on December 22, 2022.
  • In our records, the coldest December daytime high in Canada was -49°C (-56°F) in Mayo on December 20, 2022.

Thousand Islands National Park weather in December: frequently asked questions

What is the weather like in Thousand Islands National Park, Canada in December?

In December, Thousand Islands National Park, Canada generally has poor weather conditions. Brockville sees daytime temperatures near 1°C (34°F), with nights cooling to roughly -6°C (21°F).

What is the average temperature in Thousand Islands National Park, Canada in December?

In Brockville, the average daytime high in December is 1°C (34°F), while nighttime temperatures drop to around -6°C (21°F).

Does Thousand Islands National Park, Canada get a lot of snow/rain in December?

Thousand Islands National Park, Canada sees substantial snow/rainfall in December. Brockville typically averages about 107 mm (4.2 in), a mix of wet and dry days, but bring an umbrella.

Is December a Good Time to Visit Thousand Islands National Park, Canada?

Given the typically poor weather conditions in Brockville, December may not be the ideal time to visit Thousand Islands National Park, Canada.

Generally speaking, May, July, August and September provide perfect weather in Brockville. The weather in January, February, March, November and December, on the other hand, tends to be poor.

Interested in more climate information?

We have much more information about the climate in Thousand Islands National Park.

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.

Bucket list

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