December is one of the cooler months of the year in Thompson, with average highs near -18.7°C and lows around -26.7°C (mean -22.7°C). It is one of the drier months, averaging 24 mm of rainfall and 99% relative humidity across the period.
December is one of the cooler months of the year in Thompson. Across 45 years of records, the warmest December in Thompson was 2023 — when the month averaged -13.2°C — while the coldest was 2013 at -31.8°C. Typical December days reach -18.7°C with nights near -26.7°C. The long-term trend is warming, about 0.8°C per decade.
December is one of the drier months in Thompson, averaging 24 mm of rainfall. The wettest December on record was 1982 with 48 mm, while the driest was 2000 at 10 mm.
Relative humidity in Thompson during December averages 99%. The most humid Decembers were 1997 and 2006 at 100%, and the least humid was 2025 at 96%.
December receives about 0.5 kWh/m²/day of solar energy in Thompson. The sunniest December was 2013 at 0.7 kWh/m²/day, and the cloudiest were 2015, 2023 and 2024, among others at 0.4.
Average wind speed in Thompson during December is 0.5 m/s. The windiest Decembers were 2022, 2023 and 2025, among others at 0.5 m/s, while the calmest were 2019, 2020 and 2024, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -24.5°C | -22.9°C | -22.4°C | -22.0°C | -21.4°C | +3.1°C |
| Avg High | -20.4°C | -18.5°C | -18.6°C | -18.3°C | -17.6°C | +2.8°C |
| Avg Low | -28.7°C | -27.2°C | -26.3°C | -25.8°C | -25.2°C | +3.5°C |
| Avg Rain | 24 mm | 24 mm | 22 mm | 20 mm | 29 mm | +5 mm |
December temperatures in Thompson have risen by about 4.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -49.4°C (2004) to a record high of 0°C (1999).
Rainfall in December is one of the drier months, averaging 24 mm, with a wettest year of 48 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.9°C per decade, narrowing the gap between day and night.
A quieter season to visit Thompson
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Thompson. That said, December — with days averaging -18.7°C and nights around -26.7°C (mean -22.7°C) and low rainfall (24 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 | -21.4°C | -25.2°C | -29.0°C | -14.9°C | -41.2°C | 29 mm | 96% | 0.5 m/s | — |
| 2024 | -16.0°C | -19.6°C | -23.2°C | -1.6°C | -38.0°C | 31 mm | 100% | 0.4 m/s | 0.4 |
| 2023 🔥 | -9.4°C | -13.2°C | -16.9°C | -2.9°C | -30.3°C | 16 mm | 99% | 0.5 m/s | 0.4 |
| 2022 | -20.4°C | -23.8°C | -27.1°C | -5.8°C | -39.7°C | 25 mm | 99% | 0.5 m/s | 0.5 |
| 2021 | -21.9°C | -25.9°C | -29.9°C | -12.5°C | -41.8°C | 41 mm | 99% | 0.5 m/s | 0.5 |
| 2020 | -16.4°C | -20.8°C | -25.2°C | -0.1°C | -40.8°C | 34 mm | 99% | 0.4 m/s | 0.5 |
| 2019 | -20.0°C | -23.4°C | -26.8°C | -11.9°C | -42.4°C | 18 mm | 100% | 0.4 m/s | 0.5 |
| 2018 | -16.0°C | -19.5°C | -23.0°C | -3.0°C | -44.3°C | 15 mm | 100% | 0.4 m/s | 0.5 |
| 2017 | -20.1°C | -24.1°C | -28.0°C | -4.8°C | -43.4°C | 20 mm | 99% | 0.5 m/s | 0.6 |
| 2016 | -19.4°C | -23.4°C | -27.3°C | -6.1°C | -41.1°C | 21 mm | 100% | 0.4 m/s | 0.5 |
| 2015 | -12.9°C | -15.9°C | -18.9°C | -3.4°C | -39.7°C | 19 mm | 98% | 0.4 m/s | 0.4 |
| 2014 | -15.6°C | -19.2°C | -22.8°C | -3.1°C | -38.0°C | 15 mm | 99% | 0.5 m/s | 0.5 |
| 2013 ❄️ | -27.1°C | -31.8°C | -36.6°C | -16.3°C | -45.3°C | 11 mm | 99% | 0.4 m/s | 0.7 |
| 2012 | -19.9°C | -23.4°C | -26.9°C | -10.8°C | -42.8°C | 27 mm | 99% | 0.4 m/s | 0.5 |
| 2011 | -14.2°C | -19.2°C | -24.1°C | -4.8°C | -38.4°C | 28 mm | 100% | 0.5 m/s | 0.5 |
| 2010 | -17.5°C | -20.6°C | -23.8°C | -12.3°C | -38.2°C | 28 mm | 100% | 0.5 m/s | 0.5 |
| 2009 | -21.0°C | -24.3°C | -27.6°C | -11.3°C | -41.5°C | 13 mm | 97% | 0.5 m/s | 0.5 |
| 2008 | -24.9°C | -29.2°C | -33.5°C | -11.5°C | -45.1°C | 12 mm | 97% | 0.5 m/s | 0.6 |
| 2007 | -19.7°C | -23.3°C | -26.9°C | -12.2°C | -37.3°C | 21 mm | 100% | 0.4 m/s | 0.6 |
| 2006 | -13.8°C | -17.7°C | -21.6°C | -0.7°C | -36.6°C | 18 mm | 100% | 0.5 m/s | 0.5 |
| 2005 | -15.4°C | -19.0°C | -22.6°C | -7.9°C | -34.6°C | 40 mm | 97% | 0.5 m/s | 0.4 |
| 2004 | -25.0°C | -29.6°C | -34.1°C | -12.9°C | -49.4°C | 25 mm | 99% | 0.4 m/s | 0.6 |
| 2003 | -14.1°C | -18.1°C | -22.1°C | -5.9°C | -40.0°C | 15 mm | 99% | 0.5 m/s | 0.5 |
| 2002 | -13.8°C | -17.4°C | -20.9°C | -6.1°C | -32.2°C | 33 mm | 98% | 0.5 m/s | 0.5 |
| 2001 | -14.5°C | -18.2°C | -21.9°C | -3.2°C | -36.9°C | 36 mm | 98% | 0.5 m/s | 0.5 |
| 2000 | -23.7°C | -27.7°C | -31.6°C | -6.9°C | -40.0°C | 10 mm | 99% | 0.5 m/s | 0.6 |
| 1999 | -15.5°C | -20.4°C | -25.3°C | 0.0°C | -40.8°C | 46 mm | 100% | 0.5 m/s | 0.4 |
| 1998 | -19.2°C | -23.1°C | -27.0°C | -2.6°C | -42.9°C | 12 mm | 100% | 0.4 m/s | 0.6 |
| 1997 | -12.3°C | -16.4°C | -20.5°C | -2.8°C | -40.4°C | 16 mm | 100% | 0.4 m/s | 0.5 |
| 1996 | -21.3°C | -25.4°C | -29.5°C | -6.4°C | -47.4°C | 23 mm | 100% | 0.4 m/s | 0.5 |
| 1995 | -19.1°C | -23.7°C | -28.2°C | -10.4°C | -44.8°C | 36 mm | 99% | 0.4 m/s | 0.5 |
| 1994 | -15.6°C | -19.4°C | -23.1°C | -3.5°C | -42.2°C | 22 mm | 100% | 0.4 m/s | 0.5 |
| 1993 | -20.3°C | -24.5°C | -28.8°C | -6.2°C | -44.6°C | 14 mm | 99% | 0.4 m/s | 0.4 |
| 1992 | -20.7°C | -25.1°C | -29.6°C | -8.5°C | -44.6°C | 16 mm | 97% | 0.5 m/s | 0.6 |
| 1991 | -17.8°C | -22.0°C | -26.3°C | -5.5°C | -43.4°C | 29 mm | 100% | 0.4 m/s | 0.5 |
| 1990 | -23.7°C | -28.9°C | -34.0°C | -1.7°C | -48.7°C | 28 mm | 99% | 0.5 m/s | 0.6 |
| 1989 | -25.4°C | -29.8°C | -34.1°C | -7.5°C | -45.4°C | 19 mm | 99% | 0.5 m/s | 0.5 |
| 1988 | -20.4°C | -24.7°C | -29.0°C | -0.9°C | -44.9°C | 20 mm | 100% | 0.5 m/s | 0.4 |
| 1987 | -14.3°C | -17.5°C | -20.7°C | -3.0°C | -37.1°C | 20 mm | 99% | 0.4 m/s | 0.5 |
| 1986 | -15.5°C | -19.9°C | -24.4°C | -6.4°C | -42.6°C | 34 mm | 100% | 0.5 m/s | 0.5 |
| 1985 | -19.9°C | -23.4°C | -26.9°C | -10.0°C | -37.6°C | 26 mm | 99% | 0.5 m/s | 0.5 |
| 1984 | -24.2°C | -29.3°C | -34.3°C | -2.7°C | -46.0°C | 19 mm | 99% | 0.5 m/s | 0.6 |
| 1983 | -23.4°C | -27.7°C | -32.0°C | -12.1°C | -42.8°C | 13 mm | 99% | 0.5 m/s | — |
| 1982 🌧️ | -21.3°C | -25.3°C | -29.3°C | -8.3°C | -42.4°C | 48 mm | 100% | 0.5 m/s | — |
| 1981 | -19.4°C | -23.3°C | -27.3°C | -6.9°C | -45.7°C | 17 mm | 100% | 0.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -18.7°C with lows near -26.7°C (mean -22.7°C), based on 45 years of NASA POWER data.
December averages 24 mm of rainfall in Thompson, one of the drier months. The wettest on record was 48 mm in 1982.
The hottest December reached 0°C in 1999. The coldest dipped to -49.4°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 4.3°C. Daytime highs moved from -21.6°C to -17.8°C and overnight lows from -30°C to -25.2°C over the same span.
December is one of the cooler months of the year in Thompson and one of the drier months, so plan for around -18.7°C daytime highs and -26.7°C at night.
Not quite — December is the 2nd coolest month in Thompson, averaging -22.7°C.
For December in Thompson, pack warm layers and a jacket for chilly mornings, with typical highs of -18.7°C and lows of -26.7°C.
Relative humidity in December averages 99% — quite humid.
Average wind speed in December is 0.5 m/s. The windiest December on record averaged 0.5 m/s (1982).
The wettest December on record was 1982 with 48 mm. On average, December sees 24 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 Thompson 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.
