December is one of the cooler months of the year in Fort St. John, with average highs near -9.5°C and lows around -17.2°C (mean -13.3°C). It is about average for rainfall, averaging 42 mm of rainfall and 98% relative humidity across the period.
December is one of the cooler months of the year in Fort St. John. Across 45 years of records, the warmest December in Fort St. John was 1997 — when the month averaged -4.8°C — while the coldest was 1984 at -21.3°C. Typical December days reach -9.5°C with nights near -17.2°C. The long-term December temperature trend is broadly flat.
December is about average for rainfall in Fort St. John, averaging 42 mm of rainfall. The wettest December on record was 2025 with 138 mm, while the driest were 2002 and 2017 at 10 mm.
Relative humidity in Fort St. John during December averages 98%. The most humid December was 2007 at 99%, and the least humid was 2004 at 93%.
December receives about 0.4 kWh/m²/day of solar energy in Fort St. John. The sunniest Decembers were 2019, 2021 and 2023, among others at 0.5 kWh/m²/day, and the cloudiest were 2020, 2022 and 2024, among others at 0.4.
Average wind speed in Fort St. John during December is 0.7 m/s. The windiest Decembers were 1997, 2004 and 2011, among others at 0.9 m/s, while the calmest were 2002, 2010 and 2024, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -13.7°C | -13.5°C | -12.0°C | -13.8°C | -13.9°C | -0.2°C |
| Avg High | -9.9°C | -9.5°C | -8.3°C | -10.0°C | -10.3°C | -0.4°C |
| Avg Low | -17.6°C | -17.5°C | -15.7°C | -17.7°C | -17.6°C | 0°C |
| Avg Rain | 32 mm | 46 mm | 35 mm | 47 mm | 56 mm | +24 mm |
December temperatures in Fort St. John have risen by about 1.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -48.4°C (1992) to a record high of 4.3°C (2005).
Rainfall in December is about average for rainfall, averaging 42 mm, with a wettest year of 138 mm.
A quieter season to visit Fort St. John
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Fort St. John. That said, December — with days averaging -9.5°C and nights around -17.2°C (mean -13.3°C) and moderate rainfall (42 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 🌧️ | -16.1°C | -19.8°C | -23.5°C | 0.1°C | -36.2°C | 138 mm | 99% | 0.7 m/s | — |
| 2024 | -7.6°C | -11.2°C | -14.9°C | 0.3°C | -31.9°C | 58 mm | 99% | 0.6 m/s | 0.4 |
| 2023 | -2.0°C | -5.4°C | -8.8°C | 2.1°C | -13.9°C | 19 mm | 95% | 0.7 m/s | 0.5 |
| 2022 | -14.9°C | -18.5°C | -22.1°C | -3.4°C | -37.2°C | 51 mm | 95% | 0.8 m/s | 0.4 |
| 2021 | -15.4°C | -19.4°C | -23.5°C | 1.9°C | -40.5°C | 31 mm | 95% | 0.7 m/s | 0.5 |
| 2020 | -6.1°C | -9.3°C | -12.6°C | 3.3°C | -21.8°C | 40 mm | 97% | 0.7 m/s | 0.4 |
| 2019 | -7.4°C | -11.0°C | -14.5°C | 0.3°C | -20.3°C | 25 mm | 97% | 0.7 m/s | 0.5 |
| 2018 | -7.5°C | -11.5°C | -15.4°C | 0.2°C | -23.3°C | 61 mm | 99% | 0.8 m/s | 0.5 |
| 2017 | -10.6°C | -14.1°C | -17.7°C | 0.1°C | -43.9°C | 10 mm | 99% | 0.8 m/s | 0.5 |
| 2016 | -12.3°C | -16.2°C | -20.1°C | 0.3°C | -32.9°C | 18 mm | 99% | 0.8 m/s | 0.5 |
| 2015 | -9.2°C | -12.7°C | -16.2°C | 1.9°C | -27.3°C | 35 mm | 98% | 0.7 m/s | 0.5 |
| 2014 | -7.6°C | -11.6°C | -15.6°C | 0.4°C | -31.0°C | 46 mm | 98% | 0.7 m/s | 0.5 |
| 2013 | -12.0°C | -16.5°C | -21.1°C | 0.4°C | -33.9°C | 131 mm | 99% | 0.8 m/s | 0.4 |
| 2012 | -15.2°C | -18.9°C | -22.6°C | -0.1°C | -32.6°C | 51 mm | 99% | 0.7 m/s | 0.4 |
| 2011 | -3.4°C | -7.4°C | -11.5°C | 2.2°C | -19.3°C | 42 mm | 96% | 0.9 m/s | 0.4 |
| 2010 | -14.7°C | -18.3°C | -21.9°C | -0.7°C | -30.9°C | 51 mm | 98% | 0.6 m/s | 0.4 |
| 2009 | -14.2°C | -18.2°C | -22.2°C | 0.2°C | -44.1°C | 33 mm | 99% | 0.7 m/s | 0.5 |
| 2008 | -14.4°C | -18.8°C | -23.2°C | 0.4°C | -38.0°C | 61 mm | 98% | 0.8 m/s | 0.4 |
| 2007 | -10.8°C | -14.5°C | -18.3°C | -1.0°C | -33.8°C | 39 mm | 99% | 0.7 m/s | 0.5 |
| 2006 | -4.3°C | -8.3°C | -12.4°C | 0.4°C | -22.8°C | 34 mm | 99% | 0.8 m/s | 0.4 |
| 2005 | -3.8°C | -6.3°C | -8.7°C | 4.3°C | -21.7°C | 32 mm | 93% | 0.7 m/s | 0.4 |
| 2004 | -6.0°C | -9.6°C | -13.3°C | 3.4°C | -28.6°C | 53 mm | 93% | 0.9 m/s | 0.4 |
| 2003 | -7.2°C | -11.0°C | -14.8°C | 0.0°C | -25.3°C | 24 mm | 99% | 0.7 m/s | 0.5 |
| 2002 | -3.6°C | -6.6°C | -9.5°C | 1.9°C | -17.2°C | 10 mm | 96% | 0.6 m/s | 0.5 |
| 2001 | -10.2°C | -14.6°C | -18.9°C | 0.3°C | -30.2°C | 34 mm | 99% | 0.6 m/s | 0.5 |
| 2000 | -9.0°C | -12.5°C | -16.1°C | 2.8°C | -25.4°C | 31 mm | 93% | 0.7 m/s | 0.4 |
| 1999 | -5.1°C | -8.6°C | -12.2°C | 0.2°C | -26.0°C | 40 mm | 99% | 0.8 m/s | 0.4 |
| 1998 | -10.9°C | -14.7°C | -18.5°C | 0.5°C | -33.2°C | 47 mm | 99% | 0.8 m/s | 0.5 |
| 1997 🔥 | -1.7°C | -4.8°C | -8.0°C | 2.3°C | -25.3°C | 35 mm | 95% | 0.9 m/s | 0.4 |
| 1996 | -16.1°C | -20.5°C | -24.9°C | -2.3°C | -43.8°C | 35 mm | 99% | 0.7 m/s | 0.4 |
| 1995 | -14.0°C | -17.7°C | -21.4°C | -1.5°C | -41.3°C | 43 mm | 99% | 0.7 m/s | 0.5 |
| 1994 | -9.2°C | -12.9°C | -16.7°C | 0.4°C | -35.7°C | 33 mm | 98% | 0.7 m/s | 0.4 |
| 1993 | -4.8°C | -8.8°C | -12.9°C | 1.0°C | -21.1°C | 41 mm | 97% | 0.8 m/s | 0.5 |
| 1992 | -15.1°C | -20.0°C | -24.8°C | 0.2°C | -48.4°C | 49 mm | 98% | 0.8 m/s | 0.5 |
| 1991 | -5.7°C | -9.3°C | -13.0°C | 0.2°C | -26.0°C | 74 mm | 98% | 0.8 m/s | 0.4 |
| 1990 | -12.3°C | -17.5°C | -22.8°C | 0.4°C | -44.4°C | 61 mm | 99% | 0.9 m/s | 0.4 |
| 1989 | -5.4°C | -8.5°C | -11.6°C | 2.3°C | -33.4°C | 60 mm | 95% | 0.8 m/s | 0.4 |
| 1988 | -8.9°C | -12.7°C | -16.6°C | 0.3°C | -27.7°C | 35 mm | 98% | 0.7 m/s | 0.5 |
| 1987 | -6.0°C | -9.4°C | -12.8°C | 0.1°C | -24.0°C | 24 mm | 97% | 0.8 m/s | 0.5 |
| 1986 | -5.6°C | -9.6°C | -13.5°C | 0.0°C | -21.8°C | 12 mm | 99% | 0.8 m/s | 0.5 |
| 1985 | -6.1°C | -9.4°C | -12.6°C | 0.6°C | -35.6°C | 25 mm | 98% | 0.8 m/s | 0.4 |
| 1984 ❄️ | -16.0°C | -21.3°C | -26.6°C | 0.3°C | -38.3°C | 32 mm | 99% | 0.8 m/s | 0.4 |
| 1983 | -17.0°C | -20.9°C | -24.8°C | -3.1°C | -39.4°C | 27 mm | 99% | 0.7 m/s | — |
| 1982 | -11.2°C | -15.0°C | -18.8°C | -3.2°C | -30.0°C | 30 mm | 99% | 0.7 m/s | — |
| 1981 | -12.8°C | -16.8°C | -20.8°C | -0.5°C | -40.9°C | 40 mm | 99% | 0.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -9.5°C with lows near -17.2°C (mean -13.3°C), based on 45 years of NASA POWER data.
December averages 42 mm of rainfall in Fort St. John, about average for rainfall. The wettest on record was 138 mm in 2025.
The hottest December reached 4.3°C in 2005. The coldest dipped to -48.4°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.8°C. Daytime highs moved from -12.6°C to -11.2°C and overnight lows from -20.7°C to -18.6°C over the same span.
December is one of the cooler months of the year in Fort St. John and about average for rainfall, so plan for around -9.5°C daytime highs and -17.2°C at night.
Not quite — December is the 2nd coolest month in Fort St. John, averaging -13.3°C.
For December in Fort St. John, pack warm layers and a jacket for chilly mornings, with typical highs of -9.5°C and lows of -17.2°C.
Relative humidity in December averages 98% — quite humid.
Average wind speed in December is 0.7 m/s. The windiest December on record averaged 0.9 m/s (1990).
The wettest December on record was 2025 with 138 mm. On average, December sees 42 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 Fort St. John 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.
