Monthly climate averages for Cornwall, Canada. Based on 10-year ERA5 reanalysis data.
Dfa Hot-Summer Continental
Climate OverviewCornwall, Canada in December has cold conditions, with highs averaging around 0.7°C (33°F). Rain falls on about 13 days this month.
This month falls at the beginning of Winter. Cold conditions dominate the month.
Daily highs in December gradually drop from around 3°C (37°F) at the start to 0°C (32°F) by month's end.
December sees fairly even rainfall, totalling about 90 mm across the month.
The warmest days tend to fall around the 1th, averaging 3.4°C (38°F).
Compared to November, this month is about 6°C cooler with 0 fewer rainy days. Temperatures begin dropping heading into January.
Daily averages based on historical data (2016–2025)
Cold daytime highs of 1°C (33°F) mean shorter outdoor excursions with warming breaks. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.
3 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -2°C / -10°C | -7°C / -15°C | 12days (80 mm) Wet | 4.9h Fair | 77% Humid | 1.9 Low | Poor | View Details |
| February | 0°C / -10°C | -5°C / -15°C | 13days (82 mm) Wet | 6h Fair | 75% Muggy | 2.9 Moderate | Poor | View Details |
| March | 4°C / -5°C | 0°C / -9°C | 13days (90 mm) Wet | 7.4h Good | 72% Muggy | 4 Moderate | Poor | View Details |
| April | 11°C / 2°C | 8°C / -2°C | 13days (115 mm) Wet | 8.3h Good | 68% Muggy | 4.7 Moderate | Poor | View Details |
| May best | 19°C / 9°C | 18°C / 6°C | 12days (90 mm) Wet | 10.2h Excellent | 69% Muggy | 5.6 High | Good | View Details |
| June best | 24°C / 14°C | 25°C / 13°C | 13days (104 mm) Wet | 10.8h Excellent | 71% Muggy | 6.1 High | Excellent | View Details |
| July best | 27°C / 18°C | 28°C / 18°C | 12days (112 mm) Wet | 11.9h Excellent | 74% Muggy | 6.6 High | Excellent | View Details |
| August best | 25°C / 17°C | 27°C / 18°C | 13days (115 mm) Wet | 10.6h Excellent | 76% Humid | 5.7 High | Excellent | View Details |
| September best | 22°C / 14°C | 22°C / 13°C | 8days (68 mm) Wet | 9.3h Good | 76% Humid | 4.8 Moderate | Excellent | View Details |
| October | 15°C / 8°C | 13°C / 5°C | 13days (130 mm) Wet | 6.6h Fair | 76% Humid | 3.1 Moderate | Fair | View Details |
| November | 6°C / 0°C | 3°C / -4°C | 13days (92 mm) Wet | 5.1h Fair | 77% Humid | 2 Low | Poor | View Details |
| December | 1°C / -5°C | -3°C / -10°C | 13days (90 mm) Wet | 4.2h Fair | 77% Humid | 1.5 Low | Poor | View Details |
Full winter gear is a must — insulated coat, thermal base layers, warm hat, gloves, and waterproof boots.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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