December is one of the cooler months of the year in Williams Lake, with average highs near -5°C and lows around -12.4°C (mean -8.7°C). It is about average for rainfall, averaging 51 mm of rainfall and 97% relative humidity across the period.
December is one of the cooler months of the year in Williams Lake. Across 45 years of records, the warmest December in Williams Lake was 2023 — when the month averaged -3.1°C — while the coldest was 1984 at -17.2°C. Typical December days reach -5°C with nights near -12.4°C. The long-term trend is warming, about 0.6°C per decade.
December is about average for rainfall in Williams Lake, averaging 51 mm of rainfall. The wettest December on record was 2008 with 106 mm, while the driest was 1987 at 24 mm.
Relative humidity in Williams Lake during December averages 97%. The most humid December was 1996 at 100%, and the least humid was 1987 at 90%.
December receives about 0.7 kWh/m²/day of solar energy in Williams Lake. The sunniest December was 2016 at 0.9 kWh/m²/day, and the cloudiest were 1989, 1990 and 1991 at 0.5.
Average wind speed in Williams Lake during December is 0.2 m/s. The windiest Decembers were 2016, 2017 and 2022, among others at 0.3 m/s, while the calmest were 2004, 2023 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -9.8°C | -9.1°C | -8.8°C | -8.1°C | -7.4°C | +2.4°C |
| Avg High | -5.9°C | -5.3°C | -5.0°C | -4.5°C | -4.1°C | +1.8°C |
| Avg Low | -13.6°C | -12.9°C | -12.6°C | -11.6°C | -10.8°C | +2.8°C |
| Avg Rain | 43 mm | 54 mm | 49 mm | 52 mm | 58 mm | +15 mm |
December temperatures in Williams Lake have risen by about 4.2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -42.8°C (1990) to a record high of 5.5°C (2014).
Rainfall in December is about average for rainfall, averaging 51 mm, with a wettest year of 106 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 Williams Lake
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Williams Lake. That said, December — with days averaging -5°C and nights around -12.4°C (mean -8.7°C) and moderate rainfall (51 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 | -1.9°C | -4.6°C | -7.4°C | 2.8°C | -25.4°C | 69 mm | 95% | 0.1 m/s | — |
| 2024 | -2.0°C | -5.4°C | -8.7°C | 0.4°C | -15.8°C | 63 mm | 99% | 0.2 m/s | 0.6 |
| 2023 🔥 | -0.3°C | -3.1°C | -5.9°C | 3.0°C | -13.3°C | 45 mm | 96% | 0.1 m/s | 0.6 |
| 2022 | -8.5°C | -12.8°C | -17.1°C | 0.4°C | -38.6°C | 46 mm | 96% | 0.3 m/s | 0.7 |
| 2021 | -10.0°C | -13.9°C | -17.8°C | 2.5°C | -38.5°C | 81 mm | 94% | 0.2 m/s | 0.7 |
| 2020 | -2.0°C | -4.9°C | -7.9°C | 2.0°C | -15.6°C | 46 mm | 96% | 0.2 m/s | 0.6 |
| 2019 | -3.8°C | -7.2°C | -10.7°C | 0.9°C | -17.0°C | 80 mm | 99% | 0.2 m/s | 0.6 |
| 2018 | -1.9°C | -5.0°C | -8.1°C | 4.5°C | -17.8°C | 51 mm | 92% | 0.2 m/s | 0.7 |
| 2017 | -5.8°C | -9.5°C | -13.1°C | 2.2°C | -26.0°C | 36 mm | 94% | 0.3 m/s | 0.8 |
| 2016 | -9.6°C | -14.2°C | -18.7°C | 0.3°C | -32.1°C | 46 mm | 98% | 0.3 m/s | 0.9 |
| 2015 | -4.2°C | -7.8°C | -11.3°C | 2.7°C | -23.3°C | 53 mm | 98% | 0.2 m/s | 0.7 |
| 2014 | -2.6°C | -5.7°C | -8.7°C | 5.5°C | -23.2°C | 45 mm | 96% | 0.2 m/s | 0.7 |
| 2013 | -5.8°C | -9.3°C | -12.8°C | 0.2°C | -30.6°C | 72 mm | 99% | 0.2 m/s | 0.6 |
| 2012 | -4.3°C | -7.5°C | -10.8°C | 3.5°C | -18.8°C | 63 mm | 97% | 0.2 m/s | 0.7 |
| 2011 | -2.2°C | -5.6°C | -8.9°C | 1.0°C | -15.3°C | 50 mm | 96% | 0.2 m/s | 0.7 |
| 2010 | -5.1°C | -8.8°C | -12.6°C | 0.0°C | -24.7°C | 24 mm | 100% | 0.2 m/s | 0.7 |
| 2009 | -8.6°C | -12.9°C | -17.2°C | 0.3°C | -31.1°C | 35 mm | 96% | 0.3 m/s | 0.8 |
| 2008 🌧️ | -10.3°C | -14.7°C | -19.1°C | 1.8°C | -39.7°C | 106 mm | 98% | 0.2 m/s | 0.7 |
| 2007 | -5.2°C | -8.9°C | -12.6°C | 1.4°C | -21.8°C | 50 mm | 97% | 0.2 m/s | 0.6 |
| 2006 | -3.9°C | -7.4°C | -11.0°C | 0.1°C | -20.8°C | 52 mm | 99% | 0.2 m/s | 0.7 |
| 2005 | -3.1°C | -6.6°C | -10.1°C | 3.8°C | -21.3°C | 36 mm | 95% | 0.2 m/s | 0.6 |
| 2004 | -3.7°C | -7.2°C | -10.7°C | 0.2°C | -22.2°C | 66 mm | 100% | 0.1 m/s | 0.6 |
| 2003 | -4.2°C | -7.9°C | -11.6°C | 0.0°C | -22.2°C | 31 mm | 100% | 0.1 m/s | 0.7 |
| 2002 | -0.8°C | -4.0°C | -7.2°C | 4.6°C | -12.2°C | 25 mm | 92% | 0.1 m/s | 0.6 |
| 2001 | -4.9°C | -9.1°C | -13.2°C | 0.2°C | -22.9°C | 48 mm | 99% | 0.2 m/s | 0.6 |
| 2000 | -5.8°C | -9.4°C | -13.0°C | 1.0°C | -25.7°C | 43 mm | 97% | 0.2 m/s | 0.7 |
| 1999 | -1.8°C | -5.3°C | -8.9°C | 1.7°C | -14.0°C | 54 mm | 96% | 0.2 m/s | 0.6 |
| 1998 | -4.6°C | -7.9°C | -11.2°C | 1.2°C | -29.4°C | 66 mm | 96% | 0.2 m/s | 0.6 |
| 1997 | -1.3°C | -4.1°C | -6.9°C | 2.0°C | -12.6°C | 59 mm | 93% | 0.1 m/s | 0.7 |
| 1996 | -11.0°C | -15.7°C | -20.4°C | 0.0°C | -41.1°C | 58 mm | 100% | 0.2 m/s | 0.7 |
| 1995 | -5.8°C | -9.7°C | -13.6°C | 0.3°C | -31.2°C | 50 mm | 97% | 0.2 m/s | 0.7 |
| 1994 | -4.8°C | -8.4°C | -12.0°C | 1.6°C | -28.3°C | 40 mm | 96% | 0.2 m/s | 0.7 |
| 1993 | -3.4°C | -7.3°C | -11.2°C | 1.0°C | -23.1°C | 47 mm | 99% | 0.2 m/s | 0.6 |
| 1992 | -9.1°C | -13.5°C | -17.9°C | 0.0°C | -32.5°C | 59 mm | 99% | 0.2 m/s | 0.7 |
| 1991 | -2.0°C | -5.4°C | -8.7°C | 0.9°C | -15.4°C | 31 mm | 97% | 0.1 m/s | 0.5 |
| 1990 | -9.0°C | -13.7°C | -18.4°C | 0.9°C | -42.8°C | 74 mm | 100% | 0.2 m/s | 0.5 |
| 1989 | -2.5°C | -5.5°C | -8.4°C | 1.0°C | -22.3°C | 68 mm | 98% | 0.2 m/s | 0.5 |
| 1988 | -4.4°C | -8.2°C | -12.0°C | 1.9°C | -28.6°C | 47 mm | 95% | 0.2 m/s | 0.7 |
| 1987 | -2.9°C | -6.1°C | -9.3°C | 3.4°C | -18.5°C | 24 mm | 90% | 0.2 m/s | 0.7 |
| 1986 | -3.6°C | -6.9°C | -10.2°C | 0.1°C | -16.4°C | 39 mm | 98% | 0.2 m/s | 0.7 |
| 1985 | -4.9°C | -8.6°C | -12.2°C | 1.5°C | -29.6°C | 28 mm | 99% | 0.2 m/s | 0.6 |
| 1984 ❄️ | -12.3°C | -17.2°C | -22.0°C | -0.4°C | -41.0°C | 65 mm | 99% | 0.3 m/s | 0.7 |
| 1983 | -12.2°C | -17.1°C | -22.1°C | -1.0°C | -37.9°C | 33 mm | 99% | 0.3 m/s | — |
| 1982 | -5.4°C | -9.1°C | -12.9°C | 0.2°C | -18.7°C | 34 mm | 99% | 0.2 m/s | — |
| 1981 | -5.1°C | -9.2°C | -13.2°C | 1.9°C | -29.6°C | 48 mm | 95% | 0.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -5°C with lows near -12.4°C (mean -8.7°C), based on 45 years of NASA POWER data.
December averages 51 mm of rainfall in Williams Lake, about average for rainfall. The wettest on record was 106 mm in 2008.
The hottest December reached 5.5°C in 2014. The coldest dipped to -42.8°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 4.2°C. Daytime highs moved from -8°C to -4.5°C and overnight lows from -16.5°C to -11.4°C over the same span.
December is one of the cooler months of the year in Williams Lake and about average for rainfall, so plan for around -5°C daytime highs and -12.4°C at night.
Yes — December is the coldest month of the year in Williams Lake, averaging -8.7°C.
For December in Williams Lake, pack warm layers and a jacket for chilly mornings, with typical highs of -5°C and lows of -12.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 97% — quite humid.
Average wind speed in December is 0.2 m/s. The windiest December on record averaged 0.3 m/s (1981).
The wettest December on record was 2008 with 106 mm. On average, December sees 51 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 Williams Lake 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.
