December is one of the cooler months of the year in Chilliwack, with average highs near 0.6°C and lows around -5.1°C (mean -2.2°C). It is a relatively wet time of year, averaging 239 mm of rainfall and 95% relative humidity across the period.
December is one of the cooler months of the year in Chilliwack. Across 45 years of records, the warmest December in Chilliwack was 2023 — when the month averaged 1.4°C — while the coldest was 1983 at -7.5°C. Typical December days reach 0.6°C with nights near -5.1°C. The long-term trend is warming, about 0.4°C per decade.
December is a relatively wet time of year in Chilliwack, averaging 239 mm of rainfall. The wettest December on record was 2025 with 522 mm, while the driest was 1985 at 48 mm.
Relative humidity in Chilliwack during December averages 95%. The most humid December was 1981 at 98%, and the least humid was 1985 at 88%.
December receives about 0.8 kWh/m²/day of solar energy in Chilliwack. The sunniest December was 2009 at 1.1 kWh/m²/day, and the cloudiest was 2012 at 0.6.
Average wind speed in Chilliwack during December is 0.3 m/s. The windiest Decembers were 1993, 2011 and 2017, among others at 0.4 m/s, while the calmest were 2022, 2023 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -3.0°C | -2.5°C | -2.0°C | -2.1°C | -1.4°C | +1.6°C |
| Avg High | 0.2°C | 0.3°C | 1.0°C | 0.7°C | 1.2°C | +1°C |
| Avg Low | -6.1°C | -5.2°C | -4.9°C | -4.9°C | -4.1°C | +2°C |
| Avg Rain | 191 mm | 270 mm | 209 mm | 238 mm | 315 mm | +124 mm |
December temperatures in Chilliwack have risen by about 2.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -30.4°C (1990) to a record high of 10.4°C (2014).
Rainfall in December is a relatively wet time of year, averaging 239 mm, with a wettest year of 522 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
A quieter season to visit Chilliwack
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Chilliwack. That said, December — with days averaging 0.6°C and nights around -5.1°C (mean -2.2°C) and higher rainfall (239 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 | 0.0°C | -1.8°C | 7.5°C | -17.7°C | 522 mm | 97% | 0.2 m/s | — |
| 2024 | 2.1°C | -0.1°C | -2.2°C | 4.8°C | -8.2°C | 285 mm | 96% | 0.3 m/s | 0.9 |
| 2023 🔥 | 4.0°C | 1.4°C | -1.2°C | 7.8°C | -7.2°C | 258 mm | 96% | 0.2 m/s | 0.8 |
| 2022 | -1.4°C | -4.7°C | -8.1°C | 4.2°C | -22.5°C | 266 mm | 97% | 0.2 m/s | 0.9 |
| 2021 | -1.8°C | -5.1°C | -8.5°C | 8.8°C | -25.0°C | 278 mm | 97% | 0.2 m/s | 0.8 |
| 2020 | 2.6°C | 0.0°C | -2.6°C | 6.2°C | -13.2°C | 279 mm | 96% | 0.2 m/s | 1 |
| 2019 | 1.9°C | -0.2°C | -2.3°C | 5.1°C | -10.8°C | 256 mm | 96% | 0.3 m/s | 0.7 |
| 2018 | 1.7°C | -1.1°C | -4.0°C | 5.5°C | -12.6°C | 318 mm | 95% | 0.2 m/s | 0.9 |
| 2017 | 0.6°C | -2.6°C | -5.7°C | 5.7°C | -18.2°C | 213 mm | 91% | 0.4 m/s | 0.9 |
| 2016 | -2.3°C | -5.7°C | -9.0°C | 2.3°C | -21.2°C | 209 mm | 97% | 0.2 m/s | 0.9 |
| 2015 | 0.8°C | -1.6°C | -4.1°C | 7.5°C | -16.8°C | 329 mm | 97% | 0.3 m/s | 0.8 |
| 2014 | 2.8°C | -0.2°C | -3.2°C | 10.4°C | -17.6°C | 238 mm | 95% | 0.2 m/s | 1 |
| 2013 | -0.7°C | -3.5°C | -6.2°C | 5.0°C | -21.6°C | 149 mm | 92% | 0.3 m/s | 0.8 |
| 2012 | 0.2°C | -2.4°C | -4.9°C | 3.8°C | -11.9°C | 258 mm | 98% | 0.3 m/s | 0.6 |
| 2011 | 1.4°C | -1.5°C | -4.4°C | 4.5°C | -11.8°C | 146 mm | 91% | 0.4 m/s | 1 |
| 2010 | 0.4°C | -2.5°C | -5.3°C | 4.3°C | -18.7°C | 260 mm | 96% | 0.2 m/s | 0.8 |
| 2009 | -0.5°C | -4.0°C | -7.5°C | 6.0°C | -20.2°C | 108 mm | 91% | 0.3 m/s | 1.1 |
| 2008 | -1.8°C | -5.0°C | -8.3°C | 9.7°C | -25.8°C | 189 mm | 95% | 0.2 m/s | 0.8 |
| 2007 | 0.6°C | -2.0°C | -4.5°C | 7.9°C | -10.4°C | 343 mm | 96% | 0.2 m/s | 0.8 |
| 2006 | 1.1°C | -1.7°C | -4.6°C | 3.9°C | -14.6°C | 245 mm | 95% | 0.3 m/s | 0.7 |
| 2005 | 2.0°C | -0.9°C | -3.9°C | 9.8°C | -12.0°C | 185 mm | 92% | 0.3 m/s | 0.8 |
| 2004 | 2.7°C | 0.4°C | -2.0°C | 7.3°C | -7.3°C | 249 mm | 96% | 0.2 m/s | 0.8 |
| 2003 | 0.7°C | -1.9°C | -4.6°C | 4.1°C | -15.8°C | 179 mm | 97% | 0.2 m/s | 0.9 |
| 2002 | 3.5°C | 0.3°C | -2.8°C | 9.0°C | -10.6°C | 208 mm | 95% | 0.3 m/s | 0.8 |
| 2001 | 0.7°C | -2.4°C | -5.5°C | 2.6°C | -10.4°C | 243 mm | 97% | 0.2 m/s | 0.8 |
| 2000 | 0.8°C | -2.5°C | -5.7°C | 5.9°C | -15.0°C | 138 mm | 93% | 0.3 m/s | 0.8 |
| 1999 | 2.1°C | 0.0°C | -2.0°C | 6.5°C | -5.3°C | 310 mm | 93% | 0.3 m/s | 0.8 |
| 1998 | -0.5°C | -2.9°C | -5.4°C | 4.7°C | -24.9°C | 392 mm | 96% | 0.2 m/s | 0.7 |
| 1997 | 2.2°C | -0.5°C | -3.2°C | 5.0°C | -8.2°C | 238 mm | 95% | 0.2 m/s | 0.9 |
| 1996 | -1.6°C | -4.8°C | -7.9°C | 2.8°C | -19.0°C | 317 mm | 96% | 0.2 m/s | 0.8 |
| 1995 | 1.4°C | -1.5°C | -4.3°C | 5.3°C | -17.9°C | 245 mm | 95% | 0.2 m/s | 0.8 |
| 1994 | 0.0°C | -2.9°C | -5.8°C | 4.1°C | -18.8°C | 285 mm | 96% | 0.2 m/s | 0.9 |
| 1993 | 2.3°C | -0.6°C | -3.5°C | 5.2°C | -9.2°C | 208 mm | 90% | 0.4 m/s | 0.8 |
| 1992 | -1.9°C | -5.0°C | -8.1°C | 1.7°C | -19.1°C | 180 mm | 96% | 0.2 m/s | 0.8 |
| 1991 | 2.1°C | -0.2°C | -2.5°C | 5.3°C | -9.5°C | 195 mm | 96% | 0.2 m/s | 0.8 |
| 1990 | -3.0°C | -6.4°C | -9.8°C | 2.9°C | -30.4°C | 325 mm | 96% | 0.3 m/s | 0.8 |
| 1989 | 3.6°C | 0.9°C | -1.8°C | 9.4°C | -10.2°C | 191 mm | 93% | 0.3 m/s | 0.7 |
| 1988 | 1.2°C | -1.4°C | -3.9°C | 5.4°C | -15.0°C | 191 mm | 93% | 0.3 m/s | 0.8 |
| 1987 | -0.2°C | -3.6°C | -7.0°C | 4.6°C | -14.7°C | 252 mm | 94% | 0.3 m/s | 0.8 |
| 1986 | 1.6°C | -1.7°C | -5.0°C | 4.4°C | -11.9°C | 157 mm | 95% | 0.2 m/s | 0.8 |
| 1985 | 1.3°C | -1.8°C | -4.9°C | 5.7°C | -22.7°C | 48 mm | 88% | 0.4 m/s | 0.9 |
| 1984 | -2.7°C | -6.7°C | -10.6°C | 1.8°C | -24.2°C | 220 mm | 94% | 0.3 m/s | 0.9 |
| 1983 ❄️ | -3.8°C | -7.5°C | -11.3°C | 2.3°C | -27.6°C | 132 mm | 93% | 0.2 m/s | — |
| 1982 | 0.6°C | -2.5°C | -5.6°C | 4.1°C | -14.5°C | 257 mm | 93% | 0.3 m/s | — |
| 1981 | 0.2°C | -2.5°C | -5.2°C | 3.9°C | -14.4°C | 270 mm | 98% | 0.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 0.6°C with lows near -5.1°C (mean -2.2°C), based on 45 years of NASA POWER data.
December averages 239 mm of rainfall in Chilliwack, a relatively wet time of year. The wettest on record was 522 mm in 2025.
The hottest December reached 10.4°C in 2014. The coldest dipped to -30.4°C in 1990.
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 -0.9°C to 1°C and overnight lows from -7.5°C to -4.4°C over the same span.
December is one of the cooler months of the year in Chilliwack and a relatively wet time of year, so plan for around 0.6°C daytime highs and -5.1°C at night.
Yes — December is the coldest month of the year in Chilliwack, averaging -2.2°C.
For December in Chilliwack, pack warm layers and a jacket for chilly mornings, with typical highs of 0.6°C and lows of -5.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 95% — quite humid.
Average wind speed in December is 0.3 m/s. The windiest December on record averaged 0.4 m/s (1985).
The wettest December on record was 2025 with 522 mm. On average, December sees 239 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 Chilliwack 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.
