December is one of the cooler months of the year in Salaberry-de-Valleyfield, with average highs near -3.3°C and lows around -11.8°C (mean -7.5°C). It is about average for rainfall, averaging 83 mm of rainfall and 93% relative humidity across the period.
December is one of the cooler months of the year in Salaberry-de-Valleyfield. Across 45 years of records, the warmest December in Salaberry-de-Valleyfield was 2015 — when the month averaged -0.4°C — while the coldest was 1989 at -19.4°C. Typical December days reach -3.3°C with nights near -11.8°C. The long-term trend is warming, about 0.6°C per decade.
December is about average for rainfall in Salaberry-de-Valleyfield, averaging 83 mm of rainfall. The wettest December on record was 1983 with 144 mm, while the driest was 2002 at 32 mm.
Relative humidity in Salaberry-de-Valleyfield during December averages 93%. The most humid December was 1995 at 99%, and the least humid were 1998 and 2020 at 86%.
December receives about 1 kWh/m²/day of solar energy in Salaberry-de-Valleyfield. The sunniest December was 1989 at 1.4 kWh/m²/day, and the cloudiest were 2015, 2020 and 2023, among others at 0.9.
Average wind speed in Salaberry-de-Valleyfield during December is 1.4 m/s. The windiest Decembers were 1983 and 2025 at 1.6 m/s, while the calmest were 2011, 2018 and 2023, among others at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -9.4°C | -6.9°C | -8.1°C | -7.1°C | -5.4°C | +4°C |
| Avg High | -4.9°C | -2.6°C | -3.8°C | -3.0°C | -1.6°C | +3.3°C |
| Avg Low | -13.9°C | -11.3°C | -12.4°C | -11.1°C | -9.2°C | +4.7°C |
| Avg Rain | 76 mm | 69 mm | 97 mm | 90 mm | 81 mm | +5 mm |
December temperatures in Salaberry-de-Valleyfield have risen by about 2.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -43.4°C (1993) to a record high of 17.1°C (2015).
Rainfall in December is about average for rainfall, averaging 83 mm, with a wettest year of 144 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.8°C per decade, narrowing the gap between day and night.
A quieter season to visit Salaberry-de-Valleyfield
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Salaberry-de-Valleyfield. That said, December — with days averaging -3.3°C and nights around -11.8°C (mean -7.5°C) and higher rainfall (83 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 | -5.0°C | -9.6°C | -14.1°C | 6.7°C | -26.3°C | 69 mm | 90% | 1.6 m/s | — |
| 2024 | -2.7°C | -6.3°C | -9.8°C | 6.5°C | -25.3°C | 87 mm | 91% | 1.3 m/s | 1 |
| 2023 | -0.3°C | -3.8°C | -7.3°C | 5.6°C | -21.2°C | 105 mm | 93% | 1.2 m/s | 0.9 |
| 2022 | -0.3°C | -4.0°C | -7.8°C | 5.9°C | -19.8°C | 92 mm | 90% | 1.5 m/s | 1 |
| 2021 | -0.8°C | -4.8°C | -8.7°C | 12.3°C | -16.1°C | 63 mm | 87% | 1.5 m/s | 1 |
| 2020 | -0.3°C | -4.0°C | -7.7°C | 9.6°C | -17.8°C | 72 mm | 86% | 1.4 m/s | 0.9 |
| 2019 | -2.4°C | -6.4°C | -10.5°C | 5.2°C | -21.7°C | 64 mm | 92% | 1.5 m/s | 1.1 |
| 2018 | -4.0°C | -9.1°C | -14.3°C | 2.3°C | -26.2°C | 96 mm | 95% | 1.2 m/s | 1.1 |
| 2017 | -6.7°C | -10.1°C | -13.6°C | 7.8°C | -31.2°C | 57 mm | 91% | 1.4 m/s | 1.1 |
| 2016 | -2.5°C | -7.0°C | -11.6°C | 4.8°C | -28.6°C | 87 mm | 93% | 1.4 m/s | 1 |
| 2015 🔥 | 2.9°C | -0.4°C | -3.6°C | 17.1°C | -13.4°C | 118 mm | 92% | 1.3 m/s | 0.9 |
| 2014 | -2.3°C | -6.1°C | -9.9°C | 6.2°C | -20.9°C | 77 mm | 91% | 1.4 m/s | 1 |
| 2013 | -7.0°C | -11.2°C | -15.3°C | 3.5°C | -29.8°C | 68 mm | 94% | 1.3 m/s | 1 |
| 2012 | -2.3°C | -6.6°C | -10.9°C | 13.3°C | -22.8°C | 133 mm | 94% | 1.4 m/s | 1 |
| 2011 | -0.8°C | -5.1°C | -9.3°C | 6.7°C | -28.9°C | 98 mm | 90% | 1.2 m/s | 1 |
| 2010 | -4.7°C | -8.6°C | -12.4°C | 8.3°C | -22.6°C | 101 mm | 95% | 1.3 m/s | 1 |
| 2009 | -4.6°C | -8.4°C | -12.2°C | 6.0°C | -26.9°C | 98 mm | 96% | 1.3 m/s | 1.2 |
| 2008 | -4.8°C | -9.9°C | -14.9°C | 7.3°C | -27.6°C | 127 mm | 93% | 1.5 m/s | 1 |
| 2007 | -5.7°C | -10.1°C | -14.5°C | 0.7°C | -27.7°C | 116 mm | 98% | 1.4 m/s | 1 |
| 2006 | 0.4°C | -3.2°C | -6.9°C | 8.8°C | -17.3°C | 94 mm | 93% | 1.4 m/s | 1.1 |
| 2005 | -3.8°C | -7.8°C | -11.7°C | 3.3°C | -26.7°C | 76 mm | 94% | 1.4 m/s | 1.1 |
| 2004 | -5.1°C | -10.6°C | -16.2°C | 5.9°C | -35.5°C | 117 mm | 96% | 1.5 m/s | 1 |
| 2003 | -4.0°C | -8.2°C | -12.5°C | 1.7°C | -25.1°C | 141 mm | 96% | 1.4 m/s | 1.1 |
| 2002 | -3.1°C | -7.4°C | -11.6°C | 3.6°C | -24.4°C | 32 mm | 93% | 1.4 m/s | 1.1 |
| 2001 | 1.2°C | -2.3°C | -5.9°C | 12.5°C | -15.7°C | 62 mm | 93% | 1.2 m/s | 1.2 |
| 2000 | -8.2°C | -13.0°C | -17.9°C | 4.5°C | -30.5°C | 105 mm | 97% | 1.5 m/s | 1.1 |
| 1999 | -1.2°C | -5.5°C | -9.9°C | 10.1°C | -26.8°C | 67 mm | 90% | 1.4 m/s | 0.9 |
| 1998 | 1.8°C | -2.8°C | -7.3°C | 14.7°C | -27.8°C | 54 mm | 86% | 1.5 m/s | 1.1 |
| 1997 | -4.8°C | -9.8°C | -14.8°C | 0.8°C | -30.7°C | 50 mm | 98% | 1.2 m/s | 1.2 |
| 1996 | -0.8°C | -4.0°C | -7.3°C | 5.8°C | -26.9°C | 108 mm | 94% | 1.2 m/s | 0.9 |
| 1995 | -7.2°C | -11.8°C | -16.4°C | 0.2°C | -28.5°C | 54 mm | 99% | 1.3 m/s | 1.3 |
| 1994 | -1.1°C | -5.1°C | -9.2°C | 5.6°C | -21.2°C | 45 mm | 90% | 1.3 m/s | 1 |
| 1993 | -4.3°C | -9.2°C | -14.1°C | 3.4°C | -43.4°C | 66 mm | 95% | 1.3 m/s | 1 |
| 1992 | -1.8°C | -5.4°C | -9.0°C | 5.2°C | -18.9°C | 39 mm | 88% | 1.5 m/s | 0.9 |
| 1991 | -4.0°C | -8.4°C | -12.8°C | 7.4°C | -26.0°C | 72 mm | 92% | 1.4 m/s | 1 |
| 1990 | -2.3°C | -7.2°C | -12.1°C | 4.3°C | -25.7°C | 138 mm | 95% | 1.4 m/s | 1.1 |
| 1989 ❄️ | -13.8°C | -19.4°C | -25.1°C | 0.2°C | -35.9°C | 36 mm | 97% | 1.3 m/s | 1.4 |
| 1988 | -4.0°C | -8.4°C | -12.7°C | 4.9°C | -27.1°C | 47 mm | 87% | 1.5 m/s | 1 |
| 1987 | -2.3°C | -6.3°C | -10.3°C | 5.5°C | -23.8°C | 62 mm | 96% | 1.2 m/s | 1 |
| 1986 | -4.0°C | -9.2°C | -14.4°C | 0.3°C | -27.5°C | 92 mm | 98% | 1.4 m/s | 1 |
| 1985 | -5.3°C | -10.0°C | -14.7°C | 3.9°C | -33.1°C | 58 mm | 93% | 1.3 m/s | 1 |
| 1984 | -2.4°C | -6.4°C | -10.4°C | 5.8°C | -27.1°C | 110 mm | 92% | 1.4 m/s | 0.9 |
| 1983 🌧️ | -7.5°C | -12.7°C | -17.8°C | 0.3°C | -36.2°C | 144 mm | 98% | 1.6 m/s | — |
| 1982 | -1.1°C | -5.3°C | -9.5°C | 11.5°C | -24.3°C | 92 mm | 90% | 1.4 m/s | — |
| 1981 | -3.4°C | -6.6°C | -9.9°C | 4.7°C | -22.9°C | 46 mm | 95% | 1.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -3.3°C with lows near -11.8°C (mean -7.5°C), based on 45 years of NASA POWER data.
December averages 83 mm of rainfall in Salaberry-de-Valleyfield, about average for rainfall. The wettest on record was 144 mm in 1983.
The hottest December reached 17.1°C in 2015. The coldest dipped to -43.4°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.5°C. Daytime highs moved from -3.9°C to -1.8°C and overnight lows from -12.5°C to -9.5°C over the same span.
December is one of the cooler months of the year in Salaberry-de-Valleyfield and about average for rainfall, so plan for around -3.3°C daytime highs and -11.8°C at night.
Not quite — December is the 3rd coolest month in Salaberry-de-Valleyfield, averaging -7.5°C.
For December in Salaberry-de-Valleyfield, pack warm layers and a jacket for chilly mornings, with typical highs of -3.3°C and lows of -11.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 93% — quite humid.
Average wind speed in December is 1.4 m/s. The windiest December on record averaged 1.6 m/s (1983).
The wettest December on record was 1983 with 144 mm. On average, December sees 83 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 Salaberry-de-Valleyfield 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.
