December is one of the cooler months of the year in Grand Falls, with average highs near -1.6°C and lows around -8.4°C (mean -5°C). It is about average for rainfall, averaging 94 mm of rainfall and 92% relative humidity across the period.
December is one of the cooler months of the year in Grand Falls. Across 45 years of records, the warmest December in Grand Falls was 2010 — when the month averaged 1.1°C — while the coldest was 2013 at -8.8°C. Typical December days reach -1.6°C with nights near -8.4°C. The long-term trend is warming, about 0.6°C per decade.
December is about average for rainfall in Grand Falls, averaging 94 mm of rainfall. The wettest December on record was 1993 with 185 mm, while the driest was 1986 at 25 mm.
Relative humidity in Grand Falls during December averages 92%. The most humid December was 2002 at 100%, and the least humid was 1990 at 83%.
December receives about 0.8 kWh/m²/day of solar energy in Grand Falls. The sunniest Decembers were 1987 and 2024 at 1 kWh/m²/day, and the cloudiest was 1984 at 0.5.
Average wind speed in Grand Falls during December is 0.1 m/s. The windiest December was 1995 at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -6.2°C | -5.7°C | -4.8°C | -4.6°C | -3.0°C | +3.2°C |
| Avg High | -2.7°C | -2.1°C | -1.4°C | -1.4°C | 0.2°C | +2.9°C |
| Avg Low | -9.7°C | -9.3°C | -8.2°C | -7.7°C | -6.2°C | +3.5°C |
| Avg Rain | 72 mm | 93 mm | 124 mm | 85 mm | 93 mm | +20 mm |
December temperatures in Grand Falls have risen by about 2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -26.9°C (1993) to a record high of 14°C (2008).
Rainfall in December is about average for rainfall, averaging 94 mm, with a wettest year of 185 mm.
A quieter season to visit Grand Falls
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Grand Falls. That said, December — with days averaging -1.6°C and nights around -8.4°C (mean -5°C) and higher rainfall (94 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 | -1.3°C | -4.7°C | -8.2°C | 10.5°C | -20.0°C | 145 mm | 94% | 0.1 m/s | — |
| 2024 | 0.4°C | -2.9°C | -6.1°C | 13.2°C | -12.8°C | 80 mm | 88% | 0.1 m/s | 1 |
| 2023 | 1.0°C | -2.5°C | -6.0°C | 11.5°C | -14.6°C | 83 mm | 91% | 0.1 m/s | 0.8 |
| 2022 | -0.6°C | -3.4°C | -6.1°C | 1.9°C | -13.8°C | 78 mm | 95% | 0.1 m/s | 0.8 |
| 2021 | -0.7°C | -3.9°C | -7.0°C | 13.0°C | -15.4°C | 99 mm | 88% | 0.1 m/s | 0.9 |
| 2020 | 2.4°C | -0.7°C | -3.7°C | 12.2°C | -12.2°C | 70 mm | 93% | 0.1 m/s | 0.8 |
| 2019 | -1.5°C | -4.8°C | -8.2°C | 8.8°C | -14.5°C | 75 mm | 90% | 0.1 m/s | 0.7 |
| 2018 | -3.6°C | -6.8°C | -10.0°C | 3.6°C | -17.6°C | 51 mm | 95% | 0.1 m/s | 0.9 |
| 2017 | -1.2°C | -4.2°C | -7.1°C | 6.1°C | -12.7°C | 94 mm | 90% | 0.1 m/s | 0.7 |
| 2016 | -2.6°C | -7.1°C | -11.6°C | 2.7°C | -21.7°C | 87 mm | 95% | 0.1 m/s | 0.8 |
| 2015 | -1.7°C | -4.7°C | -7.8°C | 5.6°C | -17.3°C | 55 mm | 87% | 0.1 m/s | 0.8 |
| 2014 | -0.2°C | -3.3°C | -6.3°C | 10.0°C | -13.9°C | 71 mm | 87% | 0.1 m/s | 0.9 |
| 2013 ❄️ | -5.4°C | -8.8°C | -12.3°C | 4.6°C | -24.0°C | 124 mm | 92% | 0.1 m/s | 0.8 |
| 2012 | -0.7°C | -3.5°C | -6.2°C | 6.9°C | -18.4°C | 110 mm | 93% | 0.1 m/s | 0.8 |
| 2011 | -0.5°C | -3.8°C | -7.0°C | 12.9°C | -16.1°C | 55 mm | 89% | 0.1 m/s | 0.9 |
| 2010 🔥 | 2.9°C | 1.1°C | -0.7°C | 7.8°C | -9.5°C | 129 mm | 95% | 0.1 m/s | 0.7 |
| 2009 | -1.6°C | -4.5°C | -7.5°C | 7.3°C | -17.7°C | 179 mm | 98% | 0.1 m/s | 0.7 |
| 2008 | 0.7°C | -3.4°C | -7.6°C | 14.0°C | -18.0°C | 109 mm | 84% | 0.1 m/s | 0.7 |
| 2007 | -5.1°C | -8.7°C | -12.4°C | 0.2°C | -23.2°C | 115 mm | 98% | 0.1 m/s | 0.9 |
| 2006 | -2.4°C | -5.9°C | -9.3°C | 5.6°C | -17.5°C | 102 mm | 95% | 0.1 m/s | 0.8 |
| 2005 | -0.8°C | -3.4°C | -6.0°C | 5.9°C | -14.8°C | 127 mm | 92% | 0.1 m/s | 0.8 |
| 2004 | -0.4°C | -4.2°C | -8.1°C | 11.4°C | -15.8°C | 154 mm | 92% | 0.1 m/s | 0.8 |
| 2003 | 0.2°C | -2.9°C | -5.9°C | 7.0°C | -16.6°C | 102 mm | 94% | 0.1 m/s | 0.7 |
| 2002 | -2.9°C | -6.8°C | -10.8°C | 0.0°C | -24.5°C | 105 mm | 100% | 0.1 m/s | 0.9 |
| 2001 | 0.0°C | -2.9°C | -5.8°C | 5.1°C | -14.2°C | 114 mm | 93% | 0.1 m/s | 0.8 |
| 2000 | -1.9°C | -5.4°C | -8.8°C | 7.2°C | -17.0°C | 129 mm | 94% | 0.1 m/s | 0.8 |
| 1999 | -1.2°C | -3.8°C | -6.5°C | 5.8°C | -14.4°C | 102 mm | 93% | 0.1 m/s | 0.6 |
| 1998 | -1.5°C | -5.2°C | -9.0°C | 5.6°C | -18.9°C | 108 mm | 90% | 0.1 m/s | 0.8 |
| 1997 | -3.3°C | -6.9°C | -10.4°C | 0.2°C | -22.9°C | 82 mm | 100% | 0.1 m/s | 0.8 |
| 1996 | 0.7°C | -2.0°C | -4.7°C | 10.5°C | -14.3°C | 71 mm | 90% | 0.1 m/s | 0.7 |
| 1995 | -3.3°C | -6.7°C | -10.2°C | 0.4°C | -20.1°C | 89 mm | 97% | 0.2 m/s | 0.9 |
| 1994 | -3.5°C | -7.4°C | -11.4°C | 0.0°C | -24.5°C | 81 mm | 98% | 0.1 m/s | 0.9 |
| 1993 🌧️ | -0.7°C | -4.3°C | -7.9°C | 9.4°C | -26.9°C | 185 mm | 95% | 0.1 m/s | 0.6 |
| 1992 | -3.7°C | -7.8°C | -11.9°C | 3.1°C | -22.3°C | 83 mm | 95% | 0.1 m/s | 0.8 |
| 1991 | -4.2°C | -8.4°C | -12.6°C | 4.0°C | -22.4°C | 69 mm | 89% | 0.1 m/s | 0.7 |
| 1990 | 0.1°C | -4.2°C | -8.4°C | 8.4°C | -19.3°C | 62 mm | 83% | 0.1 m/s | 0.7 |
| 1989 | -5.0°C | -8.5°C | -12.1°C | 0.0°C | -21.1°C | 71 mm | 99% | 0.1 m/s | 0.7 |
| 1988 | -2.7°C | -6.3°C | -9.9°C | 3.1°C | -18.3°C | 59 mm | 88% | 0.1 m/s | 0.8 |
| 1987 | -3.2°C | -6.1°C | -9.0°C | 4.5°C | -21.5°C | 90 mm | 97% | 0.1 m/s | 1 |
| 1986 | -3.1°C | -7.1°C | -11.0°C | 2.3°C | -20.7°C | 25 mm | 91% | 0.1 m/s | 0.7 |
| 1985 | -3.4°C | -6.5°C | -9.6°C | 7.0°C | -15.4°C | 47 mm | 88% | 0.1 m/s | 0.9 |
| 1984 | -2.0°C | -5.7°C | -9.5°C | 10.2°C | -22.5°C | 71 mm | 88% | 0.1 m/s | 0.5 |
| 1983 | -2.5°C | -6.0°C | -9.5°C | 5.1°C | -16.5°C | 84 mm | 89% | 0.1 m/s | — |
| 1982 | -2.5°C | -6.6°C | -10.7°C | 6.1°C | -24.3°C | 112 mm | 91% | 0.1 m/s | — |
| 1981 | -0.2°C | -2.9°C | -5.6°C | 7.5°C | -17.8°C | 92 mm | 94% | 0.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -1.6°C with lows near -8.4°C (mean -5°C), based on 45 years of NASA POWER data.
December averages 94 mm of rainfall in Grand Falls, about average for rainfall. The wettest on record was 185 mm in 1993.
The hottest December reached 14°C in 2008. The coldest dipped to -26.9°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2°C. Daytime highs moved from -2.1°C to -0.2°C and overnight lows from -9°C to -6.7°C over the same span.
December is one of the cooler months of the year in Grand Falls and about average for rainfall, so plan for around -1.6°C daytime highs and -8.4°C at night.
Not quite — December is the 3rd coolest month in Grand Falls, averaging -5°C.
For December in Grand Falls, pack warm layers and a jacket for chilly mornings, with typical highs of -1.6°C and lows of -8.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 92% — quite humid.
Average wind speed in December is 0.1 m/s. The windiest December on record averaged 0.2 m/s (1995).
The wettest December on record was 1993 with 185 mm. On average, December sees 94 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 Grand Falls 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.
