December is one of the cooler months of the year in Whitehorse, with average highs near -13.4°C and lows around -19.8°C (mean -16.6°C). It is about average for rainfall, averaging 40 mm of rainfall and 97% relative humidity across the period.
December is one of the cooler months of the year in Whitehorse. Across 45 years of records, the warmest December in Whitehorse was 1985 — when the month averaged -11°C — while the coldest was 2025 at -27.1°C. Typical December days reach -13.4°C with nights near -19.8°C. The long-term December temperature trend is broadly flat.
December is about average for rainfall in Whitehorse, averaging 40 mm of rainfall. The wettest December on record was 2025 with 98 mm, while the driest was 1983 at 8 mm.
Relative humidity in Whitehorse during December averages 97%. The most humid December was 2007 at 99%, and the least humid was 2017 at 91%.
December receives about 0.2 kWh/m²/day of solar energy in Whitehorse. The sunniest Decembers were 2022, 2023 and 2024, among others at 0.2 kWh/m²/day, and the cloudiest were 2022, 2023 and 2024, among others at 0.2.
Average wind speed in Whitehorse during December is 1.3 m/s. The windiest December was 2011 at 2 m/s, while the calmest were 2002, 2007 and 2010, among others at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -16.2°C | -17.3°C | -16.1°C | -16.3°C | -17.3°C | -1.1°C |
| Avg High | -13.0°C | -13.8°C | -13.0°C | -13.4°C | -14.1°C | -1.1°C |
| Avg Low | -19.4°C | -20.8°C | -19.3°C | -19.3°C | -20.5°C | -1.1°C |
| Avg Rain | 31 mm | 40 mm | 38 mm | 39 mm | 56 mm | +25 mm |
December temperatures in Whitehorse have stayed relatively stable across the record.
December has ranged from a record low of -45.2°C (2025) to a record high of 1°C (1999).
Rainfall in December is about average for rainfall, averaging 40 mm, with a wettest year of 98 mm.
A quieter season to visit Whitehorse
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Whitehorse. That said, December — with days averaging -13.4°C and nights around -19.8°C (mean -16.6°C) and moderate rainfall (40 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 ❄️ 🌧️ | -24.1°C | -27.1°C | -30.1°C | -2.6°C | -45.2°C | 98 mm | 97% | 1.3 m/s | — |
| 2024 | -10.7°C | -13.5°C | -16.3°C | 0.4°C | -32.0°C | 39 mm | 98% | 1.2 m/s | 0.2 |
| 2023 | -8.6°C | -11.9°C | -15.1°C | -0.7°C | -21.3°C | 50 mm | 98% | 1.6 m/s | 0.2 |
| 2022 | -15.8°C | -19.0°C | -22.2°C | -3.3°C | -39.0°C | 37 mm | 98% | 1.3 m/s | 0.2 |
| 2021 | -15.7°C | -19.6°C | -23.5°C | -4.8°C | -32.4°C | 49 mm | 97% | 1.3 m/s | 0.2 |
| 2020 | -10.0°C | -13.0°C | -16.0°C | 0.4°C | -25.2°C | 66 mm | 98% | 1.4 m/s | 0.2 |
| 2019 | -10.2°C | -12.6°C | -15.1°C | -3.7°C | -25.2°C | 52 mm | 99% | 1.3 m/s | 0.2 |
| 2018 | -11.3°C | -14.2°C | -17.0°C | -3.8°C | -25.6°C | 30 mm | 98% | 1.4 m/s | 0.2 |
| 2017 | -10.4°C | -13.6°C | -16.8°C | 0.3°C | -35.6°C | 31 mm | 91% | 1.7 m/s | 0.2 |
| 2016 | -15.8°C | -18.5°C | -21.1°C | -3.1°C | -37.7°C | 39 mm | 96% | 1.3 m/s | 0.2 |
| 2015 | -13.8°C | -16.3°C | -18.9°C | -6.1°C | -28.6°C | 29 mm | 99% | 1.1 m/s | 0.2 |
| 2014 | -11.3°C | -13.7°C | -16.2°C | -4.5°C | -27.3°C | 26 mm | 96% | 1.2 m/s | 0.2 |
| 2013 | -14.3°C | -18.0°C | -21.7°C | -3.0°C | -34.5°C | 79 mm | 94% | 1.2 m/s | 0.2 |
| 2012 | -18.4°C | -21.5°C | -24.7°C | -5.1°C | -33.9°C | 40 mm | 98% | 1.2 m/s | 0.2 |
| 2011 | -8.3°C | -12.1°C | -15.9°C | 0.9°C | -25.8°C | 45 mm | 97% | 2 m/s | 0.2 |
| 2010 | -20.1°C | -22.9°C | -25.7°C | -5.0°C | -32.4°C | 24 mm | 98% | 1 m/s | 0.2 |
| 2009 | -14.0°C | -17.0°C | -19.9°C | -5.8°C | -34.0°C | 18 mm | 97% | 1.2 m/s | 0.2 |
| 2008 | -18.4°C | -21.8°C | -25.1°C | -4.3°C | -35.1°C | 46 mm | 94% | 1.2 m/s | 0.2 |
| 2007 | -16.4°C | -19.3°C | -22.1°C | -6.4°C | -42.2°C | 37 mm | 99% | 1 m/s | 0.2 |
| 2006 | -8.7°C | -12.0°C | -15.4°C | -1.3°C | -23.5°C | 58 mm | 98% | 1.7 m/s | 0.2 |
| 2005 | -10.6°C | -13.6°C | -16.5°C | -1.4°C | -31.1°C | 27 mm | 99% | 1.2 m/s | 0.2 |
| 2004 | -10.9°C | -15.0°C | -19.2°C | 1.0°C | -37.7°C | 50 mm | 97% | 1.7 m/s | 0.2 |
| 2003 | -11.5°C | -14.5°C | -17.5°C | -0.1°C | -27.3°C | 47 mm | 98% | 1.4 m/s | 0.2 |
| 2002 | -11.2°C | -13.9°C | -16.6°C | -3.7°C | -26.6°C | 31 mm | 99% | 1 m/s | 0.2 |
| 2001 | -14.9°C | -17.8°C | -20.7°C | -0.1°C | -31.6°C | 44 mm | 99% | 1.1 m/s | 0.2 |
| 2000 | -13.1°C | -16.4°C | -19.7°C | -1.3°C | -32.9°C | 27 mm | 97% | 1.2 m/s | 0.2 |
| 1999 | -10.3°C | -13.5°C | -16.6°C | 1.0°C | -32.3°C | 44 mm | 98% | 1.8 m/s | 0.2 |
| 1998 | -15.2°C | -18.7°C | -22.1°C | -3.7°C | -35.8°C | 39 mm | 96% | 1.1 m/s | 0.2 |
| 1997 | -7.8°C | -11.8°C | -15.8°C | 0.3°C | -32.1°C | 51 mm | 98% | 1.7 m/s | 0.2 |
| 1996 | -18.4°C | -22.1°C | -25.8°C | -2.6°C | -41.4°C | 35 mm | 98% | 1.3 m/s | 0.2 |
| 1995 | -16.5°C | -19.6°C | -22.8°C | -0.9°C | -43.4°C | 33 mm | 99% | 1.3 m/s | 0.2 |
| 1994 | -14.0°C | -17.4°C | -20.8°C | -1.9°C | -39.5°C | 22 mm | 96% | 1.5 m/s | 0.2 |
| 1993 | -10.6°C | -13.7°C | -16.9°C | -1.3°C | -30.2°C | 42 mm | 99% | 1.4 m/s | 0.2 |
| 1992 | -17.2°C | -21.0°C | -24.8°C | -3.3°C | -42.6°C | 35 mm | 94% | 1.3 m/s | 0.2 |
| 1991 | -12.2°C | -15.6°C | -18.9°C | -3.2°C | -27.0°C | 57 mm | 98% | 1.6 m/s | 0.2 |
| 1990 | -15.9°C | -19.9°C | -24.0°C | -2.6°C | -43.3°C | 38 mm | 98% | 1.4 m/s | 0.2 |
| 1989 | -9.4°C | -13.3°C | -17.1°C | 0.1°C | -40.3°C | 48 mm | 97% | 1.5 m/s | 0.2 |
| 1988 | -12.4°C | -15.9°C | -19.4°C | -1.7°C | -29.2°C | 34 mm | 98% | 1.5 m/s | 0.2 |
| 1987 | -11.6°C | -14.8°C | -18.0°C | -2.5°C | -29.7°C | 43 mm | 95% | 1.3 m/s | 0.2 |
| 1986 | -8.2°C | -11.1°C | -13.9°C | 0.0°C | -22.4°C | 32 mm | 98% | 1.4 m/s | 0.2 |
| 1985 🔥 | -7.9°C | -11.0°C | -14.1°C | 0.2°C | -30.7°C | 37 mm | 93% | 1.6 m/s | 0.2 |
| 1984 | -16.1°C | -20.1°C | -24.1°C | -5.5°C | -40.0°C | 35 mm | 97% | 1.3 m/s | 0.2 |
| 1983 | -19.6°C | -22.4°C | -25.1°C | -9.9°C | -37.7°C | 8 mm | 94% | 1 m/s | — |
| 1982 | -13.2°C | -15.9°C | -18.7°C | -4.8°C | -28.0°C | 22 mm | 99% | 1.1 m/s | — |
| 1981 | -18.4°C | -21.2°C | -24.0°C | -3.8°C | -42.1°C | 21 mm | 99% | 1.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -13.4°C with lows near -19.8°C (mean -16.6°C), based on 45 years of NASA POWER data.
December averages 40 mm of rainfall in Whitehorse, about average for rainfall. The wettest on record was 98 mm in 2025.
The hottest December reached 1°C in 1999. The coldest dipped to -45.2°C in 2025.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have fallen by about 0.1°C. Daytime highs moved from -15°C to -15°C and overnight lows from -21.2°C to -21.4°C over the same span.
December is one of the cooler months of the year in Whitehorse and about average for rainfall, so plan for around -13.4°C daytime highs and -19.8°C at night.
Not quite — December is the 2nd coolest month in Whitehorse, averaging -16.6°C.
For December in Whitehorse, pack warm layers and a jacket for chilly mornings, with typical highs of -13.4°C and lows of -19.8°C.
Relative humidity in December averages 97% — quite humid.
Average wind speed in December is 1.3 m/s. The windiest December on record averaged 2 m/s (2011).
The wettest December on record was 2025 with 98 mm. On average, December sees 40 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 Whitehorse 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.
