December is one of the cooler months of the year in Red Deer, with average highs near -5.3°C and lows around -13.2°C (mean -9.2°C). It is one of the drier months, averaging 19 mm of rainfall and 86% relative humidity across the period.
December is one of the cooler months of the year in Red Deer. Across 45 years of records, the warmest Decembers in Red Deer were 1999 and 2023 — when the month averaged -2.6°C — while the coldest was 1983 at -18.6°C. Typical December days reach -5.3°C with nights near -13.2°C. The long-term trend is warming, about 0.3°C per decade.
December is one of the drier months in Red Deer, averaging 19 mm of rainfall. The wettest December on record was 2013 with 43 mm, while the driest was 1997 at 4 mm.
Relative humidity in Red Deer during December averages 86%. The most humid December was 2012 at 94%, and the least humid was 1997 at 73%.
December receives about 0.8 kWh/m²/day of solar energy in Red Deer. The sunniest December was 2003 at 1 kWh/m²/day, and the cloudiest were 2004, 2005 and 2008, among others at 0.7.
Average wind speed in Red Deer during December is 2.9 m/s. The windiest Decembers were 2004 and 2016 at 3.5 m/s, while the calmest was 2010 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -9.6°C | -9.5°C | -8.6°C | -9.3°C | -9.0°C | +0.6°C |
| Avg High | -5.8°C | -5.4°C | -4.8°C | -5.4°C | -5.0°C | +0.8°C |
| Avg Low | -13.4°C | -13.7°C | -12.4°C | -13.2°C | -12.9°C | +0.5°C |
| Avg Rain | 16 mm | 19 mm | 18 mm | 19 mm | 22 mm | +6 mm |
December temperatures in Red Deer have risen by about 2.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -41.1°C (1983) to a record high of 8.5°C (1999).
Rainfall in December is one of the drier months, averaging 19 mm, with a wettest year of 43 mm.
A quieter season to visit Red Deer
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Red Deer. That said, December — with days averaging -5.3°C and nights around -13.2°C (mean -9.2°C) and low rainfall (19 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 | -5.9°C | -11.1°C | -16.4°C | 4.6°C | -27.6°C | 41 mm | 91% | 3.1 m/s | — |
| 2024 | -3.4°C | -6.9°C | -10.5°C | 3.8°C | -21.3°C | 21 mm | 90% | 2.4 m/s | 0.8 |
| 2023 | 0.8°C | -2.6°C | -5.9°C | 4.6°C | -11.7°C | 16 mm | 83% | 2.5 m/s | 0.8 |
| 2022 | -10.1°C | -14.2°C | -18.3°C | 1.3°C | -31.2°C | 17 mm | 88% | 2.9 m/s | 0.9 |
| 2021 | -10.4°C | -14.3°C | -18.2°C | 2.9°C | -34.8°C | 24 mm | 83% | 2.8 m/s | 0.8 |
| 2020 | -1.1°C | -4.7°C | -8.4°C | 4.7°C | -19.6°C | 12 mm | 83% | 2.7 m/s | 0.9 |
| 2019 | -3.8°C | -7.2°C | -10.6°C | 3.4°C | -16.7°C | 17 mm | 89% | 2.3 m/s | 0.8 |
| 2018 | -2.5°C | -6.5°C | -10.5°C | 3.3°C | -21.5°C | 19 mm | 87% | 2.8 m/s | 0.8 |
| 2017 | -4.4°C | -7.7°C | -11.0°C | 7.5°C | -30.3°C | 13 mm | 76% | 3.4 m/s | 0.9 |
| 2016 | -8.6°C | -11.8°C | -15.1°C | 1.0°C | -24.5°C | 24 mm | 84% | 3.5 m/s | 0.8 |
| 2015 | -4.7°C | -8.4°C | -12.1°C | 3.2°C | -21.3°C | 16 mm | 91% | 2.3 m/s | 0.9 |
| 2014 | -2.7°C | -6.6°C | -10.6°C | 5.2°C | -22.1°C | 10 mm | 88% | 2.9 m/s | 0.8 |
| 2013 🌧️ | -8.5°C | -13.6°C | -18.7°C | 2.1°C | -35.2°C | 43 mm | 94% | 3.1 m/s | 0.9 |
| 2012 | -9.7°C | -14.3°C | -18.9°C | 0.7°C | -30.4°C | 26 mm | 94% | 2.3 m/s | 0.9 |
| 2011 | -0.8°C | -4.9°C | -9.1°C | 3.4°C | -17.3°C | 18 mm | 81% | 3.4 m/s | 0.8 |
| 2010 | -7.9°C | -11.8°C | -15.8°C | 0.8°C | -25.3°C | 8 mm | 92% | 2.2 m/s | 0.9 |
| 2009 | -10.1°C | -14.4°C | -18.7°C | 0.3°C | -35.5°C | 32 mm | 89% | 2.7 m/s | 0.9 |
| 2008 | -9.2°C | -13.2°C | -17.3°C | 5.9°C | -29.5°C | 27 mm | 86% | 3.1 m/s | 0.7 |
| 2007 | -6.4°C | -10.0°C | -13.6°C | 0.0°C | -20.6°C | 16 mm | 87% | 2.6 m/s | 0.8 |
| 2006 | -1.7°C | -6.1°C | -10.4°C | 2.2°C | -22.1°C | 14 mm | 86% | 3.1 m/s | 0.9 |
| 2005 | -2.6°C | -5.6°C | -8.5°C | 7.5°C | -21.2°C | 8 mm | 85% | 3 m/s | 0.7 |
| 2004 | -3.3°C | -7.1°C | -10.8°C | 7.5°C | -21.5°C | 33 mm | 85% | 3.5 m/s | 0.7 |
| 2003 | -2.3°C | -6.0°C | -9.7°C | 3.3°C | -17.2°C | 5 mm | 84% | 2.4 m/s | 1 |
| 2002 | -0.5°C | -4.1°C | -7.6°C | 6.4°C | -14.6°C | 15 mm | 83% | 2.5 m/s | 0.9 |
| 2001 | -4.9°C | -9.1°C | -13.3°C | 3.0°C | -20.5°C | 11 mm | 86% | 2.5 m/s | 0.8 |
| 2000 | -7.1°C | -10.8°C | -14.6°C | 6.7°C | -26.5°C | 16 mm | 87% | 2.7 m/s | 0.8 |
| 1999 🔥 | 1.0°C | -2.6°C | -6.2°C | 8.5°C | -17.9°C | 11 mm | 77% | 3.3 m/s | 0.9 |
| 1998 | -6.2°C | -10.1°C | -14.0°C | 4.7°C | -26.1°C | 21 mm | 85% | 3.4 m/s | 0.8 |
| 1997 | -0.3°C | -3.6°C | -6.9°C | 4.1°C | -15.6°C | 4 mm | 73% | 3.2 m/s | 0.9 |
| 1996 | -12.1°C | -16.6°C | -21.2°C | -0.9°C | -37.8°C | 28 mm | 93% | 2.8 m/s | 0.9 |
| 1995 | -8.8°C | -13.1°C | -17.3°C | -0.2°C | -33.0°C | 27 mm | 90% | 2.7 m/s | 0.9 |
| 1994 | -4.7°C | -8.5°C | -12.3°C | 3.6°C | -25.1°C | 14 mm | 87% | 2.8 m/s | 0.9 |
| 1993 | -1.7°C | -5.8°C | -9.8°C | 4.4°C | -18.5°C | 14 mm | 87% | 3 m/s | 0.9 |
| 1992 | -9.7°C | -14.3°C | -18.9°C | 1.3°C | -37.5°C | 30 mm | 88% | 2.6 m/s | 0.9 |
| 1991 | -2.0°C | -6.2°C | -10.4°C | 3.0°C | -19.5°C | 11 mm | 84% | 2.9 m/s | 0.8 |
| 1990 | -9.3°C | -14.7°C | -20.2°C | 2.4°C | -40.9°C | 27 mm | 91% | 3.2 m/s | 0.8 |
| 1989 | -3.9°C | -7.6°C | -11.3°C | 4.3°C | -35.6°C | 17 mm | 89% | 3.1 m/s | 0.7 |
| 1988 | -3.6°C | -7.2°C | -10.7°C | 5.6°C | -26.6°C | 19 mm | 83% | 2.7 m/s | 0.7 |
| 1987 | -1.8°C | -5.1°C | -8.4°C | 3.6°C | -19.0°C | 10 mm | 79% | 3.3 m/s | 0.8 |
| 1986 | -1.9°C | -5.8°C | -9.8°C | 1.6°C | -17.4°C | 8 mm | 86% | 2.9 m/s | 0.8 |
| 1985 | -3.2°C | -6.7°C | -10.3°C | 3.9°C | -27.6°C | 18 mm | 90% | 3.3 m/s | 0.8 |
| 1984 | -12.3°C | -17.1°C | -21.9°C | 2.0°C | -39.0°C | 26 mm | 91% | 2.6 m/s | 0.9 |
| 1983 ❄️ | -14.6°C | -18.6°C | -22.6°C | -0.9°C | -41.1°C | 19 mm | 90% | 2.6 m/s | — |
| 1982 | -4.9°C | -8.7°C | -12.6°C | 1.2°C | -22.6°C | 13 mm | 92% | 2.8 m/s | — |
| 1981 | -6.1°C | -9.6°C | -13.0°C | 2.6°C | -29.2°C | 17 mm | 84% | 2.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -5.3°C with lows near -13.2°C (mean -9.2°C), based on 45 years of NASA POWER data.
December averages 19 mm of rainfall in Red Deer, one of the drier months. The wettest on record was 43 mm in 2013.
The hottest December reached 8.5°C in 1999. The coldest dipped to -41.1°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.3°C. Daytime highs moved from -8.2°C to -5.8°C and overnight lows from -16.1°C to -13.9°C over the same span.
December is one of the cooler months of the year in Red Deer and one of the drier months, so plan for around -5.3°C daytime highs and -13.2°C at night.
Not quite — December is the 2nd coolest month in Red Deer, averaging -9.2°C.
For December in Red Deer, pack warm layers and a jacket for chilly mornings, with typical highs of -5.3°C and lows of -13.2°C.
Relative humidity in December averages 86% — quite humid.
Average wind speed in December is 2.9 m/s. The windiest December on record averaged 3.5 m/s (2004).
The wettest December on record was 2013 with 43 mm. On average, December sees 19 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 Red Deer 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.
