December is one of the cooler months of the year in Lac-Brome, with average highs near -2.8°C and lows around -10.5°C (mean -6.6°C). It is about average for rainfall, averaging 86 mm of rainfall and 93% relative humidity across the period.
December is one of the cooler months of the year in Lac-Brome. Across 45 years of records, the warmest December in Lac-Brome was 2015 — when the month averaged -0.2°C — while the coldest was 1989 at -17.5°C. Typical December days reach -2.8°C with nights near -10.5°C. The long-term trend is warming, about 0.7°C per decade.
December is about average for rainfall in Lac-Brome, averaging 86 mm of rainfall. The wettest December on record was 2003 with 182 mm, while the driest was 1988 at 46 mm.
Relative humidity in Lac-Brome during December averages 93%. The most humid Decembers were 1983 and 1997 at 99%, and the least humid was 2020 at 86%.
December receives about 1 kWh/m²/day of solar energy in Lac-Brome. The sunniest Decembers were 1989 and 2000 at 1.3 kWh/m²/day, and the cloudiest were 2015, 2016 and 2020, among others at 0.9.
Average wind speed in Lac-Brome during December is 0.7 m/s. The windiest Decembers were 2022, 2024 and 2025, among others at 0.7 m/s, while the calmest was 2013 at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -8.5°C | -6.3°C | -7.1°C | -6.0°C | -4.8°C | +3.7°C |
| Avg High | -4.3°C | -2.3°C | -3.2°C | -2.3°C | -1.1°C | +3.2°C |
| Avg Low | -12.6°C | -10.3°C | -11.0°C | -9.7°C | -8.5°C | +4.1°C |
| Avg Rain | 72 mm | 85 mm | 107 mm | 83 mm | 82 mm | +9 mm |
December temperatures in Lac-Brome have risen by about 2.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -34.9°C (1993) to a record high of 16.1°C (2015).
Rainfall in December is about average for rainfall, averaging 86 mm, with a wettest year of 182 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.8°C per decade, narrowing the gap between day and night.
A quieter season to visit Lac-Brome
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Lac-Brome. That said, December — with days averaging -2.8°C and nights around -10.5°C (mean -6.6°C) and higher rainfall (86 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 | -4.5°C | -8.8°C | -13.2°C | 9.6°C | -20.4°C | 73 mm | 93% | 0.7 m/s | — |
| 2024 | -2.3°C | -5.6°C | -8.9°C | 8.5°C | -23.5°C | 91 mm | 93% | 0.7 m/s | 1 |
| 2023 | 0.8°C | -2.7°C | -6.2°C | 14.6°C | -16.6°C | 115 mm | 94% | 0.6 m/s | 1 |
| 2022 | -0.6°C | -3.9°C | -7.2°C | 7.5°C | -13.0°C | 94 mm | 90% | 0.7 m/s | 1 |
| 2021 | -0.2°C | -4.1°C | -7.9°C | 8.7°C | -16.7°C | 62 mm | 87% | 0.6 m/s | 1 |
| 2020 | 0.4°C | -3.4°C | -7.3°C | 15.0°C | -17.6°C | 55 mm | 86% | 0.7 m/s | 0.9 |
| 2019 | -2.0°C | -5.8°C | -9.6°C | 6.5°C | -20.1°C | 67 mm | 92% | 0.7 m/s | 1.1 |
| 2018 | -2.4°C | -7.0°C | -11.5°C | 8.4°C | -21.0°C | 78 mm | 92% | 0.7 m/s | 1.1 |
| 2017 | -6.1°C | -9.5°C | -12.9°C | 5.6°C | -30.6°C | 59 mm | 92% | 0.6 m/s | 1.1 |
| 2016 | -2.2°C | -6.3°C | -10.4°C | 5.3°C | -28.6°C | 81 mm | 92% | 0.7 m/s | 0.9 |
| 2015 🔥 | 3.0°C | -0.2°C | -3.4°C | 16.1°C | -11.8°C | 109 mm | 92% | 0.6 m/s | 0.9 |
| 2014 | -2.0°C | -5.3°C | -8.6°C | 4.4°C | -18.3°C | 85 mm | 92% | 0.6 m/s | 1 |
| 2013 | -4.5°C | -8.7°C | -12.9°C | 4.4°C | -23.9°C | 79 mm | 94% | 0.5 m/s | 1 |
| 2012 | -1.4°C | -5.1°C | -8.8°C | 8.6°C | -17.5°C | 112 mm | 92% | 0.6 m/s | 1 |
| 2011 | -0.5°C | -4.2°C | -8.0°C | 5.1°C | -19.5°C | 75 mm | 90% | 0.7 m/s | 1.1 |
| 2010 | -5.2°C | -8.3°C | -11.4°C | 7.5°C | -20.3°C | 88 mm | 96% | 0.6 m/s | 0.9 |
| 2009 | -3.9°C | -7.2°C | -10.6°C | 10.2°C | -23.3°C | 92 mm | 95% | 0.7 m/s | 1.1 |
| 2008 | -3.5°C | -7.9°C | -12.3°C | 6.5°C | -25.2°C | 122 mm | 93% | 0.7 m/s | 1 |
| 2007 | -4.8°C | -8.9°C | -13.0°C | 0.4°C | -23.2°C | 109 mm | 99% | 0.6 m/s | 1 |
| 2006 | 0.3°C | -2.9°C | -6.0°C | 6.6°C | -16.7°C | 108 mm | 93% | 0.7 m/s | 1 |
| 2005 | -3.8°C | -7.7°C | -11.6°C | 2.8°C | -24.5°C | 91 mm | 96% | 0.6 m/s | 1.1 |
| 2004 | -3.6°C | -8.4°C | -13.1°C | 8.4°C | -32.8°C | 114 mm | 95% | 0.7 m/s | 1 |
| 2003 🌧️ | -3.7°C | -7.1°C | -10.5°C | 1.9°C | -20.9°C | 182 mm | 95% | 0.7 m/s | 1.2 |
| 2002 | -3.8°C | -7.9°C | -12.1°C | 1.0°C | -27.5°C | 58 mm | 97% | 0.7 m/s | 1.1 |
| 2001 | 0.9°C | -2.4°C | -5.7°C | 12.8°C | -17.1°C | 61 mm | 94% | 0.6 m/s | 1.2 |
| 2000 | -6.1°C | -10.8°C | -15.4°C | 11.2°C | -24.3°C | 130 mm | 95% | 0.7 m/s | 1.3 |
| 1999 | -1.7°C | -5.5°C | -9.2°C | 8.5°C | -21.0°C | 65 mm | 91% | 0.7 m/s | 0.9 |
| 1998 | 1.1°C | -3.2°C | -7.5°C | 12.3°C | -25.1°C | 58 mm | 89% | 0.7 m/s | 1 |
| 1997 | -3.8°C | -8.4°C | -13.0°C | 0.2°C | -24.7°C | 74 mm | 99% | 0.6 m/s | 1.1 |
| 1996 | -0.3°C | -3.6°C | -6.9°C | 8.1°C | -26.5°C | 135 mm | 94% | 0.6 m/s | 0.9 |
| 1995 | -7.3°C | -11.1°C | -14.8°C | 0.4°C | -24.4°C | 98 mm | 99% | 0.6 m/s | 1.2 |
| 1994 | -0.9°C | -5.0°C | -9.1°C | 6.0°C | -19.1°C | 65 mm | 92% | 0.6 m/s | 1 |
| 1993 | -3.6°C | -7.9°C | -12.2°C | 3.6°C | -34.9°C | 74 mm | 94% | 0.7 m/s | 1 |
| 1992 | -1.8°C | -5.4°C | -9.1°C | 4.1°C | -21.1°C | 54 mm | 91% | 0.7 m/s | 1 |
| 1991 | -3.4°C | -7.4°C | -11.5°C | 5.7°C | -23.1°C | 74 mm | 91% | 0.7 m/s | 1.1 |
| 1990 | -1.5°C | -5.6°C | -9.7°C | 5.6°C | -21.4°C | 149 mm | 94% | 0.7 m/s | 1.1 |
| 1989 ❄️ | -12.7°C | -17.5°C | -22.3°C | 0.2°C | -30.2°C | 49 mm | 97% | 0.7 m/s | 1.3 |
| 1988 | -4.2°C | -8.5°C | -12.8°C | 4.9°C | -22.5°C | 46 mm | 88% | 0.7 m/s | 1 |
| 1987 | -2.5°C | -5.7°C | -8.8°C | 3.9°C | -22.4°C | 54 mm | 95% | 0.6 m/s | 1.1 |
| 1986 | -2.5°C | -6.8°C | -11.2°C | 4.4°C | -20.3°C | 51 mm | 94% | 0.7 m/s | 1 |
| 1985 | -5.1°C | -9.4°C | -13.8°C | 4.8°C | -32.1°C | 49 mm | 94% | 0.7 m/s | 1.1 |
| 1984 | -1.3°C | -5.3°C | -9.2°C | 7.0°C | -22.7°C | 107 mm | 91% | 0.7 m/s | 0.9 |
| 1983 | -6.5°C | -11.4°C | -16.2°C | 0.5°C | -32.8°C | 150 mm | 99% | 0.7 m/s | — |
| 1982 | 0.2°C | -4.0°C | -8.3°C | 13.3°C | -21.5°C | 69 mm | 87% | 0.7 m/s | — |
| 1981 | -4.5°C | -7.5°C | -10.5°C | 2.6°C | -20.4°C | 76 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 -2.8°C with lows near -10.5°C (mean -6.6°C), based on 45 years of NASA POWER data.
December averages 86 mm of rainfall in Lac-Brome, about average for rainfall. The wettest on record was 182 mm in 2003.
The hottest December reached 16.1°C in 2015. The coldest dipped to -34.9°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 -3.4°C to -1.4°C and overnight lows from -11.6°C to -8.7°C over the same span.
December is one of the cooler months of the year in Lac-Brome and about average for rainfall, so plan for around -2.8°C daytime highs and -10.5°C at night.
Not quite — December is the 3rd coolest month in Lac-Brome, averaging -6.6°C.
For December in Lac-Brome, pack warm layers and a jacket for chilly mornings, with typical highs of -2.8°C and lows of -10.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 93% — quite humid.
Average wind speed in December is 0.7 m/s. The windiest December on record averaged 0.7 m/s (1982).
The wettest December on record was 2003 with 182 mm. On average, December sees 86 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 Lac-Brome 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.
