Brockville Weather in December
In Brockville, December brings very low daytime temperatures around 1°C (34°F), with nights cooling to -6°C (21°F). Expect quite a bit of snow/rainfall this month.
Rainfall in Brockville in December
On average, there are about 19 days with snow/rain during this month, averaging 107 mm (4.2 in). This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Brockville in December
In December, expect very low temperatures in Brockville, with highs of 1°C (34°F) and lows of -6°C (21°F) at night. During December, you'll experience the winter season. Expect a distinctly cold feel throughout the day, not just overnight. At -6°C (21°F) overnight, frost and ice are likely outside. Indoors, consider packing an extra blanket if you're unsure about the heating. The month brings very cold weather, so dressing warmly is essential. Prepare with multiple layers for added warmth.
Sunshine in Brockville in December
This month sees fewer sunny days, with about 75 hours of sunshine, perfect for those who enjoy cooler temperatures.If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Brockville. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Brockville's climate page.
Brockville Temperature in December
Min Temperature
-6°C (21°F)
Max Temperature
1°C (34°F)
Chance of Rain
63%
Precipitation
107 mm (4.2 in)
Rainy days
19 days
Sunshine
75 hours *
Percentage Sunshine
27% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Brockville typically drop from around 3°C (37°F) at the start of December to approximately -1°C (30°F) by the end. Nights are very cold, with lows typically ranging from -13°C (9°F) to -5°C (23°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Brockville in December
Browse day-by-day weather records for Brockville spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Brockville historical weather extremes in December
According to our 31 years of weather records for Brockville, the following extremes were recorded between 1994 and 2025.
- Brockville recorded its highest December temperature of 18°C (64°F) on December 6, 2001.
Best Places in Canada in December
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in December →
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What to Wear in Brockville in December
Cold weather calls for smart layering in December. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Prepare for significant rainfall with proper waterproof clothing and shoes. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.What To Do in Brockville in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Brockville's climate page.
See the full Brockville climate overview or explore weather in Canada.
