December is one of the cooler months of the year in Trois-Rivières, with average highs near -4.8°C and lows around -13.8°C (mean -9.3°C). It is about average for rainfall, averaging 85 mm of rainfall and 95% relative humidity across the period.
December is one of the cooler months of the year in Trois-Rivières. Across 45 years of records, the warmest December in Trois-Rivières was 2015 — when the month averaged -2.9°C — while the coldest was 1989 at -20.4°C. Typical December days reach -4.8°C with nights near -13.8°C. The long-term trend is warming, about 0.8°C per decade.
December is about average for rainfall in Trois-Rivières, averaging 85 mm of rainfall. The wettest December on record was 2003 with 193 mm, while the driest was 2002 at 34 mm.
Relative humidity in Trois-Rivières during December averages 95%. The most humid Decembers were 1983, 1989 and 1995 at 99%, and the least humid was 2021 at 84%.
December receives about 1 kWh/m²/day of solar energy in Trois-Rivières. The sunniest Decembers were 1989 and 1995 at 1.2 kWh/m²/day, and the cloudiest were 1984 and 2015 at 0.8.
Average wind speed in Trois-Rivières during December is 0.7 m/s. The windiest Decembers were 2022 and 2025 at 0.8 m/s, while the calmest were 2018, 2023 and 2024, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -11.5°C | -8.9°C | -9.7°C | -9.1°C | -6.4°C | +5.1°C |
| Avg High | -6.7°C | -4.3°C | -5.2°C | -4.8°C | -2.4°C | +4.3°C |
| Avg Low | -16.3°C | -13.5°C | -14.3°C | -13.5°C | -10.4°C | +5.9°C |
| Avg Rain | 85 mm | 72 mm | 101 mm | 93 mm | 67 mm | -18 mm |
December temperatures in Trois-Rivières have risen by about 3.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -38.6°C (1993) to a record high of 12.4°C (2023).
Rainfall in December is about average for rainfall, averaging 85 mm, with a wettest year of 193 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.7°C per decade while lows rose 1°C per decade, narrowing the gap between day and night.
A quieter season to visit Trois-Rivières
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Trois-Rivières. That said, December — with days averaging -4.8°C and nights around -13.8°C (mean -9.3°C) and higher rainfall (85 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | -5.8°C | -10.7°C | -15.5°C | 7.4°C | -23.5°C | 45 mm | 87% | 0.8 m/s | — |
| 2024 | -3.5°C | -7.2°C | -10.9°C | 5.4°C | -22.3°C | 56 mm | 90% | 0.6 m/s | 1 |
| 2023 | -0.5°C | -4.3°C | -8.0°C | 12.4°C | -16.3°C | 77 mm | 88% | 0.6 m/s | 0.9 |
| 2022 | -1.7°C | -5.1°C | -8.5°C | 4.2°C | -17.3°C | 93 mm | 89% | 0.8 m/s | 1 |
| 2021 | -2.2°C | -6.5°C | -10.7°C | 9.4°C | -19.3°C | 64 mm | 84% | 0.7 m/s | 1 |
| 2020 | -0.9°C | -4.8°C | -8.7°C | 11.8°C | -22.6°C | 68 mm | 89% | 0.7 m/s | 0.9 |
| 2019 | -3.5°C | -7.7°C | -12.0°C | 4.8°C | -21.2°C | 58 mm | 93% | 0.7 m/s | 1 |
| 2018 | -6.5°C | -11.8°C | -17.2°C | 1.3°C | -32.0°C | 91 mm | 98% | 0.6 m/s | 1.1 |
| 2017 | -8.4°C | -12.6°C | -16.8°C | 4.4°C | -32.8°C | 53 mm | 94% | 0.6 m/s | 1 |
| 2016 | -5.5°C | -10.7°C | -15.8°C | 0.7°C | -33.6°C | 99 mm | 98% | 0.7 m/s | 0.9 |
| 2015 🔥 | 0.5°C | -2.9°C | -6.4°C | 11.6°C | -15.5°C | 124 mm | 95% | 0.6 m/s | 0.8 |
| 2014 | -3.8°C | -7.5°C | -11.1°C | 2.6°C | -23.7°C | 87 mm | 93% | 0.6 m/s | 1.1 |
| 2013 | -8.5°C | -13.2°C | -17.9°C | 0.8°C | -31.5°C | 82 mm | 98% | 0.6 m/s | 1 |
| 2012 | -4.2°C | -8.4°C | -12.6°C | 6.1°C | -24.6°C | 123 mm | 95% | 0.6 m/s | 0.9 |
| 2011 | -2.7°C | -6.9°C | -11.2°C | 4.0°C | -31.4°C | 92 mm | 93% | 0.6 m/s | 1 |
| 2010 | -5.3°C | -9.4°C | -13.6°C | 3.2°C | -20.8°C | 118 mm | 98% | 0.7 m/s | 0.9 |
| 2009 | -5.8°C | -9.7°C | -13.6°C | 3.4°C | -27.7°C | 104 mm | 97% | 0.7 m/s | 1 |
| 2008 | -6.6°C | -12.2°C | -17.8°C | 2.1°C | -29.5°C | 133 mm | 97% | 0.7 m/s | 1 |
| 2007 | -6.9°C | -11.7°C | -16.4°C | 0.4°C | -28.3°C | 106 mm | 98% | 0.7 m/s | 1 |
| 2006 | -1.8°C | -5.7°C | -9.7°C | 3.8°C | -21.4°C | 73 mm | 95% | 0.7 m/s | 1 |
| 2005 | -4.8°C | -8.9°C | -13.0°C | 3.5°C | -29.6°C | 74 mm | 94% | 0.7 m/s | 1 |
| 2004 | -7.1°C | -13.1°C | -19.1°C | 1.8°C | -34.2°C | 120 mm | 98% | 0.7 m/s | 1 |
| 2003 🌧️ | -4.7°C | -9.0°C | -13.2°C | 1.2°C | -24.4°C | 193 mm | 95% | 0.6 m/s | 1.1 |
| 2002 | -5.3°C | -10.1°C | -14.9°C | 0.4°C | -29.1°C | 34 mm | 98% | 0.7 m/s | 1 |
| 2001 | -0.2°C | -3.5°C | -6.7°C | 9.6°C | -17.7°C | 37 mm | 91% | 0.6 m/s | 1.1 |
| 2000 | -8.8°C | -13.5°C | -18.2°C | 2.3°C | -31.9°C | 141 mm | 96% | 0.7 m/s | 1.1 |
| 1999 | -3.3°C | -7.9°C | -12.5°C | 6.3°C | -33.7°C | 66 mm | 93% | 0.6 m/s | 0.9 |
| 1998 | -1.0°C | -5.9°C | -10.8°C | 8.9°C | -37.8°C | 83 mm | 89% | 0.6 m/s | 1.1 |
| 1997 | -5.6°C | -10.7°C | -15.8°C | 0.3°C | -31.1°C | 49 mm | 98% | 0.6 m/s | 1.1 |
| 1996 | -1.6°C | -5.1°C | -8.7°C | 5.5°C | -31.2°C | 96 mm | 95% | 0.6 m/s | 0.9 |
| 1995 | -8.5°C | -13.5°C | -18.4°C | -1.1°C | -29.9°C | 53 mm | 99% | 0.6 m/s | 1.2 |
| 1994 | -3.5°C | -7.7°C | -11.9°C | 4.8°C | -26.7°C | 61 mm | 96% | 0.7 m/s | 0.9 |
| 1993 | -5.1°C | -10.1°C | -15.1°C | 3.5°C | -38.6°C | 62 mm | 96% | 0.7 m/s | 1 |
| 1992 | -3.0°C | -6.8°C | -10.6°C | 4.7°C | -21.1°C | 35 mm | 90% | 0.7 m/s | 0.9 |
| 1991 | -6.6°C | -11.3°C | -16.0°C | 4.0°C | -27.4°C | 79 mm | 94% | 0.6 m/s | 1.1 |
| 1990 | -4.8°C | -10.1°C | -15.4°C | 3.3°C | -31.4°C | 137 mm | 98% | 0.6 m/s | 1 |
| 1989 ❄️ | -14.9°C | -20.4°C | -25.9°C | 0.0°C | -35.9°C | 55 mm | 99% | 0.6 m/s | 1.2 |
| 1988 | -5.9°C | -10.4°C | -14.8°C | 3.1°C | -29.4°C | 51 mm | 90% | 0.7 m/s | 0.9 |
| 1987 | -5.5°C | -9.8°C | -14.1°C | 0.8°C | -29.2°C | 69 mm | 99% | 0.6 m/s | 1.1 |
| 1986 | -5.8°C | -11.4°C | -17.0°C | 0.3°C | -30.2°C | 76 mm | 99% | 0.6 m/s | 0.9 |
| 1985 | -6.3°C | -11.2°C | -16.1°C | 2.5°C | -35.7°C | 57 mm | 94% | 0.7 m/s | 1 |
| 1984 | -4.8°C | -9.5°C | -14.1°C | 1.8°C | -36.9°C | 119 mm | 97% | 0.6 m/s | 0.8 |
| 1983 | -8.6°C | -14.3°C | -20.0°C | 0.1°C | -38.1°C | 167 mm | 99% | 0.7 m/s | — |
| 1982 | -3.5°C | -7.7°C | -11.9°C | 9.1°C | -26.7°C | 112 mm | 92% | 0.7 m/s | — |
| 1981 | -5.4°C | -9.2°C | -13.0°C | 0.6°C | -26.8°C | 59 mm | 99% | 0.6 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -4.8°C with lows near -13.8°C (mean -9.3°C), based on 45 years of NASA POWER data.
December averages 85 mm of rainfall in Trois-Rivières, about average for rainfall. The wettest on record was 193 mm in 2003.
The hottest December reached 12.4°C in 2023. The coldest dipped to -38.6°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 3.6°C. Daytime highs moved from -5.7°C to -2.7°C and overnight lows from -15°C to -10.7°C over the same span.
December is one of the cooler months of the year in Trois-Rivières and about average for rainfall, so plan for around -4.8°C daytime highs and -13.8°C at night.
Not quite — December is the 3rd coolest month in Trois-Rivières, averaging -9.3°C.
For December in Trois-Rivières, pack warm layers and a jacket for chilly mornings, with typical highs of -4.8°C and lows of -13.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 95% — quite humid.
Average wind speed in December is 0.7 m/s. The windiest December on record averaged 0.8 m/s (2022).
The wettest December on record was 2003 with 193 mm. On average, December sees 85 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Trois-Rivières behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
