December is one of the cooler months of the year in Portage La Prairie, with average highs near -9.7°C and lows around -18.3°C (mean -14°C). It is one of the drier months, averaging 23 mm of rainfall and 92% relative humidity across the period.
December is one of the cooler months of the year in Portage La Prairie. Across 45 years of records, the warmest December in Portage La Prairie was 2023 — when the month averaged -6°C — while the coldest was 2000 at -23.5°C. Typical December days reach -9.7°C with nights near -18.3°C. The long-term trend is warming, about 0.8°C per decade.
December is one of the drier months in Portage La Prairie, averaging 23 mm of rainfall. The wettest December on record was 1996 with 45 mm, while the driest was 2011 at 7 mm.
Relative humidity in Portage La Prairie during December averages 92%. The most humid December was 1996 at 97%, and the least humid was 2011 at 84%.
December receives about 1 kWh/m²/day of solar energy in Portage La Prairie. The sunniest December was 2008 at 1.4 kWh/m²/day, and the cloudiest were 1990, 1994 and 2004 at 0.8.
Average wind speed in Portage La Prairie during December is 3.5 m/s. The windiest Decembers were 2002 and 2004 at 4 m/s, while the calmest were 1981 and 2012 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -16.2°C | -13.6°C | -13.9°C | -13.7°C | -12.1°C | +4.1°C |
| Avg High | -11.6°C | -9.3°C | -9.7°C | -9.5°C | -7.8°C | +3.8°C |
| Avg Low | -20.7°C | -17.8°C | -18.2°C | -18.0°C | -16.5°C | +4.2°C |
| Avg Rain | 19 mm | 26 mm | 30 mm | 16 mm | 26 mm | +7 mm |
December temperatures in Portage La Prairie have risen by about 5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -40.5°C (1989) to a record high of 6.2°C (1998).
Rainfall in December is one of the drier months, averaging 23 mm, with a wettest year of 45 mm.
A quieter season to visit Portage La Prairie
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Portage La Prairie. That said, December — with days averaging -9.7°C and nights around -18.3°C (mean -14°C) and low rainfall (23 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 | -11.2°C | -16.2°C | -21.2°C | 1.7°C | -31.5°C | 40 mm | 90% | 3.8 m/s | — |
| 2024 | -9.1°C | -13.4°C | -17.6°C | 1.0°C | -35.3°C | 26 mm | 96% | 3.5 m/s | 1.2 |
| 2023 🔥 | -1.9°C | -6.0°C | -10.0°C | 4.1°C | -16.9°C | 14 mm | 90% | 3.4 m/s | 1.1 |
| 2022 | -11.3°C | -15.0°C | -18.7°C | -0.3°C | -30.7°C | 29 mm | 92% | 3.7 m/s | 1.1 |
| 2021 | -8.9°C | -13.5°C | -18.1°C | 4.9°C | -36.0°C | 23 mm | 87% | 3.7 m/s | 1.2 |
| 2020 | -4.3°C | -8.8°C | -13.3°C | 4.0°C | -33.5°C | 21 mm | 89% | 3.2 m/s | 0.9 |
| 2019 | -9.3°C | -13.9°C | -18.6°C | 1.4°C | -30.5°C | 11 mm | 93% | 3.2 m/s | 1 |
| 2018 | -7.8°C | -12.1°C | -16.4°C | 1.4°C | -33.8°C | 20 mm | 95% | 3.2 m/s | 1.2 |
| 2017 | -10.0°C | -14.4°C | -18.8°C | 2.1°C | -36.0°C | 14 mm | 88% | 3.7 m/s | 1.1 |
| 2016 | -10.3°C | -14.8°C | -19.4°C | 0.2°C | -35.9°C | 35 mm | 94% | 3.9 m/s | 1.2 |
| 2015 | -4.8°C | -8.4°C | -11.9°C | 5.6°C | -25.5°C | 23 mm | 92% | 3 m/s | 1.1 |
| 2014 | -7.9°C | -12.1°C | -16.4°C | 0.7°C | -33.8°C | 11 mm | 94% | 3.3 m/s | 1 |
| 2013 | -16.7°C | -21.4°C | -26.1°C | -3.7°C | -39.3°C | 21 mm | 90% | 3.5 m/s | 1.1 |
| 2012 | -11.9°C | -16.5°C | -21.1°C | -0.3°C | -31.3°C | 11 mm | 93% | 2.9 m/s | 1.3 |
| 2011 | -4.1°C | -8.3°C | -12.6°C | 3.6°C | -21.6°C | 7 mm | 84% | 3.8 m/s | 0.9 |
| 2010 | -11.8°C | -15.5°C | -19.1°C | -1.6°C | -31.0°C | 8 mm | 92% | 3.4 m/s | 1.3 |
| 2009 | -11.2°C | -14.2°C | -17.3°C | -1.8°C | -28.0°C | 20 mm | 86% | 3.3 m/s | 1.1 |
| 2008 | -16.6°C | -21.3°C | -26.1°C | -1.5°C | -34.2°C | 40 mm | 95% | 3.2 m/s | 1.4 |
| 2007 | -10.3°C | -15.0°C | -19.8°C | -0.9°C | -32.3°C | 26 mm | 95% | 3.1 m/s | 1 |
| 2006 | -6.1°C | -10.7°C | -15.3°C | 1.1°C | -27.2°C | 30 mm | 93% | 3.5 m/s | 1 |
| 2005 | -6.5°C | -9.8°C | -13.1°C | 1.1°C | -25.7°C | 30 mm | 92% | 3.3 m/s | 1 |
| 2004 | -9.9°C | -15.0°C | -20.0°C | 3.8°C | -34.9°C | 44 mm | 88% | 4 m/s | 0.8 |
| 2003 | -5.3°C | -9.3°C | -13.3°C | 2.3°C | -24.3°C | 33 mm | 92% | 3.5 m/s | 1.1 |
| 2002 | -5.7°C | -9.5°C | -13.3°C | 3.1°C | -24.9°C | 19 mm | 88% | 4 m/s | 0.9 |
| 2001 | -6.7°C | -10.9°C | -15.1°C | 2.3°C | -23.8°C | 29 mm | 93% | 3.4 m/s | 1.1 |
| 2000 ❄️ | -18.6°C | -23.5°C | -28.5°C | -1.2°C | -35.9°C | 34 mm | 96% | 3.1 m/s | 1.1 |
| 1999 | -3.8°C | -8.6°C | -13.5°C | 4.5°C | -29.0°C | 25 mm | 87% | 3.6 m/s | 0.9 |
| 1998 | -8.7°C | -12.8°C | -17.0°C | 6.2°C | -34.6°C | 34 mm | 88% | 3.7 m/s | 0.9 |
| 1997 | -3.0°C | -6.6°C | -10.2°C | 2.7°C | -24.2°C | 11 mm | 90% | 3.3 m/s | 1 |
| 1996 🌧️ | -15.3°C | -19.4°C | -23.5°C | -3.0°C | -36.9°C | 45 mm | 97% | 3.3 m/s | 1.2 |
| 1995 | -14.3°C | -18.6°C | -22.9°C | -1.0°C | -35.8°C | 30 mm | 96% | 3.1 m/s | 1.2 |
| 1994 | -6.1°C | -9.6°C | -13.2°C | 5.4°C | -23.2°C | 16 mm | 91% | 3.3 m/s | 0.8 |
| 1993 | -8.8°C | -13.1°C | -17.4°C | 1.2°C | -33.2°C | 10 mm | 90% | 3.4 m/s | 0.9 |
| 1992 | -12.5°C | -16.8°C | -21.1°C | -1.2°C | -35.5°C | 20 mm | 93% | 3.5 m/s | 1 |
| 1991 | -8.3°C | -13.0°C | -17.8°C | 1.1°C | -33.5°C | 34 mm | 95% | 3.7 m/s | 1 |
| 1990 | -12.7°C | -17.1°C | -21.5°C | 3.5°C | -39.8°C | 30 mm | 91% | 3.9 m/s | 0.8 |
| 1989 | -15.3°C | -20.4°C | -25.6°C | 2.8°C | -40.5°C | 20 mm | 89% | 3.6 m/s | 1.1 |
| 1988 | -10.0°C | -14.5°C | -19.0°C | 1.9°C | -32.1°C | 22 mm | 92% | 3.6 m/s | 1 |
| 1987 | -5.7°C | -9.3°C | -13.0°C | 1.5°C | -27.9°C | 18 mm | 90% | 3.4 m/s | 1 |
| 1986 | -8.0°C | -12.4°C | -16.8°C | -0.6°C | -29.2°C | 13 mm | 96% | 3.7 m/s | 1 |
| 1985 | -13.7°C | -18.7°C | -23.7°C | 1.3°C | -31.8°C | 18 mm | 96% | 3.7 m/s | 0.9 |
| 1984 | -15.5°C | -21.0°C | -26.5°C | 1.0°C | -37.5°C | 24 mm | 96% | 3.8 m/s | 0.9 |
| 1983 | -17.2°C | -21.9°C | -26.6°C | -4.9°C | -36.7°C | 9 mm | 91% | 3.3 m/s | — |
| 1982 | -9.7°C | -14.1°C | -18.5°C | 1.9°C | -34.9°C | 30 mm | 93% | 3.5 m/s | — |
| 1981 | -9.5°C | -13.2°C | -16.8°C | 0.3°C | -31.0°C | 16 mm | 89% | 2.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -9.7°C with lows near -18.3°C (mean -14°C), based on 45 years of NASA POWER data.
December averages 23 mm of rainfall in Portage La Prairie, one of the drier months. The wettest on record was 45 mm in 1996.
The hottest December reached 6.2°C in 1998. The coldest dipped to -40.5°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 5°C. Daytime highs moved from -13.1°C to -8.5°C and overnight lows from -22.4°C to -17.1°C over the same span.
December is one of the cooler months of the year in Portage La Prairie and one of the drier months, so plan for around -9.7°C daytime highs and -18.3°C at night.
Not quite — December is the 3rd coolest month in Portage La Prairie, averaging -14°C.
For December in Portage La Prairie, pack warm layers and a jacket for chilly mornings, with typical highs of -9.7°C and lows of -18.3°C.
Relative humidity in December averages 92% — quite humid.
Average wind speed in December is 3.5 m/s. The windiest December on record averaged 4 m/s (2002).
The wettest December on record was 1996 with 45 mm. On average, December sees 23 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 Portage La Prairie 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.
