December is one of the cooler months of the year in Thetford Mines, with average highs near -4.3°C and lows around -12.4°C (mean -8.3°C). It is about average for rainfall, averaging 90 mm of rainfall and 95% relative humidity across the period.
December is one of the cooler months of the year in Thetford Mines. Across 45 years of records, the warmest December in Thetford Mines was 2015 — when the month averaged -2.4°C — while the coldest was 1989 at -19.6°C. Typical December days reach -4.3°C with nights near -12.4°C. The long-term trend is warming, about 0.7°C per decade.
December is about average for rainfall in Thetford Mines, averaging 90 mm of rainfall. The wettest December on record was 2003 with 187 mm, while the driest was 2001 at 47 mm.
Relative humidity in Thetford Mines during December averages 95%. The most humid December was 1995 at 100%, and the least humid was 2021 at 88%.
December receives about 1 kWh/m²/day of solar energy in Thetford Mines. The sunniest December was 1989 at 1.3 kWh/m²/day, and the cloudiest were 1984, 2010 and 2015 at 0.8.
Average wind speed in Thetford Mines during December is 0.6 m/s. The windiest Decembers were 2008, 2020 and 2025, among others at 0.7 m/s, while the calmest were 2013, 2015 and 2023, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -10.4°C | -8.1°C | -8.6°C | -7.8°C | -6.2°C | +4.2°C |
| Avg High | -6.1°C | -3.9°C | -4.6°C | -3.8°C | -2.4°C | +3.7°C |
| Avg Low | -14.7°C | -12.3°C | -12.6°C | -11.7°C | -10.0°C | +4.7°C |
| Avg Rain | 87 mm | 82 mm | 108 mm | 89 mm | 80 mm | -7 mm |
December temperatures in Thetford Mines have risen by about 2.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -37.8°C (1983) to a record high of 13.4°C (2001).
Rainfall in December is about average for rainfall, averaging 90 mm, with a wettest year of 187 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 Thetford Mines
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Thetford Mines. That said, December — with days averaging -4.3°C and nights around -12.4°C (mean -8.3°C) and higher rainfall (90 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 | -6.0°C | -10.5°C | -15.1°C | 7.5°C | -24.5°C | 68 mm | 94% | 0.7 m/s | — |
| 2024 | -3.5°C | -6.9°C | -10.3°C | 6.6°C | -20.5°C | 92 mm | 95% | 0.6 m/s | 1 |
| 2023 | -0.6°C | -4.4°C | -8.1°C | 12.4°C | -18.4°C | 90 mm | 95% | 0.5 m/s | 1 |
| 2022 | -1.6°C | -4.8°C | -8.0°C | 4.7°C | -14.9°C | 91 mm | 91% | 0.6 m/s | 1 |
| 2021 | -1.8°C | -6.1°C | -10.3°C | 8.4°C | -19.2°C | 74 mm | 88% | 0.6 m/s | 1 |
| 2020 | -1.0°C | -4.7°C | -8.5°C | 12.7°C | -22.9°C | 66 mm | 91% | 0.7 m/s | 0.9 |
| 2019 | -3.1°C | -7.1°C | -11.1°C | 6.1°C | -18.4°C | 62 mm | 93% | 0.6 m/s | 1.1 |
| 2018 | -4.0°C | -9.0°C | -14.0°C | 6.4°C | -25.1°C | 61 mm | 95% | 0.6 m/s | 1.1 |
| 2017 | -8.2°C | -11.9°C | -15.6°C | 3.6°C | -28.6°C | 73 mm | 95% | 0.6 m/s | 1 |
| 2016 | -4.6°C | -9.0°C | -13.5°C | 1.1°C | -28.9°C | 104 mm | 98% | 0.6 m/s | 0.9 |
| 2015 🔥 | 0.7°C | -2.4°C | -5.5°C | 13.4°C | -16.1°C | 136 mm | 95% | 0.5 m/s | 0.8 |
| 2014 | -2.9°C | -6.7°C | -10.4°C | 3.9°C | -21.5°C | 88 mm | 93% | 0.6 m/s | 1 |
| 2013 | -6.6°C | -10.8°C | -15.0°C | 3.3°C | -27.5°C | 94 mm | 96% | 0.5 m/s | 1 |
| 2012 | -3.1°C | -7.1°C | -11.1°C | 6.4°C | -21.7°C | 102 mm | 94% | 0.6 m/s | 1 |
| 2011 | -1.8°C | -5.7°C | -9.6°C | 4.5°C | -22.1°C | 84 mm | 93% | 0.6 m/s | 1 |
| 2010 | -4.8°C | -8.1°C | -11.5°C | 6.5°C | -20.7°C | 91 mm | 96% | 0.6 m/s | 0.8 |
| 2009 | -5.5°C | -8.8°C | -12.2°C | 3.6°C | -24.9°C | 90 mm | 96% | 0.6 m/s | 1 |
| 2008 | -5.0°C | -9.7°C | -14.5°C | 4.8°C | -25.0°C | 145 mm | 94% | 0.7 m/s | 1 |
| 2007 | -6.6°C | -10.5°C | -14.5°C | 0.3°C | -23.8°C | 109 mm | 99% | 0.6 m/s | 1 |
| 2006 | -1.5°C | -5.2°C | -8.9°C | 5.5°C | -20.1°C | 93 mm | 95% | 0.6 m/s | 0.9 |
| 2005 | -5.0°C | -8.7°C | -12.4°C | 3.2°C | -26.8°C | 107 mm | 96% | 0.6 m/s | 1 |
| 2004 | -5.4°C | -10.4°C | -15.4°C | 3.0°C | -31.8°C | 113 mm | 97% | 0.6 m/s | 1 |
| 2003 🌧️ | -4.1°C | -7.6°C | -11.1°C | 1.3°C | -20.1°C | 187 mm | 95% | 0.6 m/s | 1.1 |
| 2002 | -5.1°C | -9.3°C | -13.6°C | 0.4°C | -27.5°C | 52 mm | 98% | 0.6 m/s | 1.1 |
| 2001 | -0.1°C | -3.3°C | -6.4°C | 13.4°C | -14.3°C | 47 mm | 92% | 0.5 m/s | 1.1 |
| 2000 | -7.7°C | -12.2°C | -16.6°C | 8.0°C | -29.7°C | 138 mm | 97% | 0.6 m/s | 1.1 |
| 1999 | -3.1°C | -7.2°C | -11.3°C | 7.1°C | -29.8°C | 69 mm | 95% | 0.6 m/s | 0.9 |
| 1998 | -0.7°C | -5.0°C | -9.3°C | 12.4°C | -28.8°C | 75 mm | 89% | 0.6 m/s | 1 |
| 1997 | -4.9°C | -9.8°C | -14.6°C | 0.2°C | -30.3°C | 55 mm | 99% | 0.5 m/s | 1.1 |
| 1996 | -1.7°C | -5.1°C | -8.6°C | 6.0°C | -31.0°C | 140 mm | 96% | 0.6 m/s | 0.9 |
| 1995 | -8.2°C | -12.4°C | -16.6°C | -1.2°C | -26.9°C | 82 mm | 100% | 0.5 m/s | 1.2 |
| 1994 | -3.0°C | -7.1°C | -11.3°C | 4.1°C | -21.3°C | 66 mm | 97% | 0.6 m/s | 0.9 |
| 1993 | -5.4°C | -9.8°C | -14.2°C | 1.7°C | -35.5°C | 77 mm | 98% | 0.6 m/s | 1 |
| 1992 | -2.8°C | -6.5°C | -10.2°C | 4.1°C | -22.5°C | 52 mm | 92% | 0.6 m/s | 1 |
| 1991 | -5.8°C | -10.0°C | -14.2°C | 4.6°C | -30.8°C | 74 mm | 94% | 0.6 m/s | 1.1 |
| 1990 | -3.2°C | -7.9°C | -12.6°C | 5.2°C | -27.5°C | 133 mm | 97% | 0.6 m/s | 1 |
| 1989 ❄️ | -14.9°C | -19.6°C | -24.4°C | 0.2°C | -33.6°C | 60 mm | 99% | 0.5 m/s | 1.3 |
| 1988 | -5.8°C | -10.2°C | -14.7°C | 4.0°C | -24.8°C | 51 mm | 92% | 0.7 m/s | 0.9 |
| 1987 | -4.6°C | -8.0°C | -11.5°C | 2.4°C | -26.0°C | 69 mm | 97% | 0.5 m/s | 1 |
| 1986 | -4.5°C | -9.6°C | -14.6°C | 1.1°C | -25.7°C | 56 mm | 98% | 0.6 m/s | 1 |
| 1985 | -6.5°C | -10.9°C | -15.2°C | 3.8°C | -33.6°C | 64 mm | 96% | 0.6 m/s | 1.1 |
| 1984 | -3.7°C | -8.0°C | -12.4°C | 2.9°C | -32.9°C | 119 mm | 97% | 0.6 m/s | 0.8 |
| 1983 | -7.7°C | -12.8°C | -17.9°C | 0.3°C | -37.8°C | 162 mm | 100% | 0.6 m/s | — |
| 1982 | -1.7°C | -6.0°C | -10.3°C | 11.2°C | -23.2°C | 103 mm | 90% | 0.6 m/s | — |
| 1981 | -5.4°C | -8.5°C | -11.6°C | 0.1°C | -22.2°C | 100 mm | 100% | 0.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -4.3°C with lows near -12.4°C (mean -8.3°C), based on 45 years of NASA POWER data.
December averages 90 mm of rainfall in Thetford Mines, about average for rainfall. The wettest on record was 187 mm in 2003.
The hottest December reached 13.4°C in 2001. The coldest dipped to -37.8°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.7°C. Daytime highs moved from -5°C to -2.7°C and overnight lows from -13.5°C to -10.4°C over the same span.
December is one of the cooler months of the year in Thetford Mines and about average for rainfall, so plan for around -4.3°C daytime highs and -12.4°C at night.
Not quite — December is the 3rd coolest month in Thetford Mines, averaging -8.3°C.
For December in Thetford Mines, pack warm layers and a jacket for chilly mornings, with typical highs of -4.3°C and lows of -12.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 95% — quite humid.
Average wind speed in December is 0.6 m/s. The windiest December on record averaged 0.7 m/s (1988).
The wettest December on record was 2003 with 187 mm. On average, December sees 90 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 Thetford Mines 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.
