December is one of the cooler months of the year in Fredericton, with average highs near -2.1°C and lows around -10.3°C (mean -6.2°C). It is about average for rainfall, averaging 101 mm of rainfall and 91% relative humidity across the period.
December is one of the cooler months of the year in Fredericton. Across 45 years of records, the warmest December in Fredericton was 2015 — when the month averaged -2.2°C — while the coldest was 1989 at -16.5°C. Typical December days reach -2.1°C with nights near -10.3°C. The long-term trend is warming, about 0.7°C per decade.
December is about average for rainfall in Fredericton, averaging 101 mm of rainfall. The wettest December on record was 2010 with 194 mm, while the driest was 1988 at 39 mm.
Relative humidity in Fredericton during December averages 91%. The most humid Decembers were 1989 and 1997 at 99%, and the least humid was 2021 at 84%.
December receives about 1.2 kWh/m²/day of solar energy in Fredericton. The sunniest December was 1989 at 1.5 kWh/m²/day, and the cloudiest were 1993 and 2013 at 0.9.
Average wind speed in Fredericton during December is 0.2 m/s. The windiest Decembers were 2023, 2024 and 2025, among others at 0.2 m/s, while the calmest were 1981, 1989 and 2013 at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -8.2°C | -6.3°C | -5.9°C | -5.9°C | -4.1°C | +4.1°C |
| Avg High | -3.8°C | -2.1°C | -2.0°C | -2.0°C | -0.2°C | +3.6°C |
| Avg Low | -12.6°C | -10.4°C | -9.9°C | -9.7°C | -8.1°C | +4.5°C |
| Avg Rain | 83 mm | 98 mm | 102 mm | 120 mm | 102 mm | +19 mm |
December temperatures in Fredericton have risen by about 2.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -34.3°C (1989) to a record high of 14.6°C (2023).
Rainfall in December is about average for rainfall, averaging 101 mm, with a wettest year of 194 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.8°C per decade, narrowing the gap between day and night.
A quieter season to visit Fredericton
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Fredericton. That said, December — with days averaging -2.1°C and nights around -10.3°C (mean -6.2°C) and higher rainfall (101 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 | -3.6°C | -7.8°C | -12.0°C | 12.1°C | -19.7°C | 73 mm | 86% | 0.2 m/s | — |
| 2024 | -0.5°C | -4.5°C | -8.5°C | 12.2°C | -17.9°C | 76 mm | 89% | 0.2 m/s | 1.3 |
| 2023 | 1.1°C | -2.6°C | -6.3°C | 14.6°C | -13.2°C | 124 mm | 90% | 0.2 m/s | 1.2 |
| 2022 | 1.0°C | -2.7°C | -6.5°C | 10.3°C | -13.9°C | 123 mm | 89% | 0.2 m/s | 1.1 |
| 2021 | 0.2°C | -4.1°C | -8.4°C | 11.5°C | -17.0°C | 72 mm | 84% | 0.2 m/s | 1.2 |
| 2020 | 0.8°C | -3.1°C | -7.1°C | 14.4°C | -20.3°C | 146 mm | 93% | 0.2 m/s | 1.1 |
| 2019 | -1.1°C | -5.2°C | -9.3°C | 10.0°C | -18.2°C | 92 mm | 89% | 0.2 m/s | 1.2 |
| 2018 | -3.9°C | -8.4°C | -12.9°C | 10.1°C | -23.5°C | 100 mm | 93% | 0.2 m/s | 1.4 |
| 2017 | -5.4°C | -9.3°C | -13.2°C | 7.1°C | -26.9°C | 102 mm | 94% | 0.2 m/s | 1.2 |
| 2016 | -4.0°C | -8.3°C | -12.6°C | 1.6°C | -28.2°C | 91 mm | 97% | 0.2 m/s | 1.2 |
| 2015 🔥 | 0.7°C | -2.2°C | -5.2°C | 7.1°C | -15.2°C | 131 mm | 95% | 0.2 m/s | 1.1 |
| 2014 | -0.1°C | -3.7°C | -7.2°C | 9.0°C | -21.0°C | 149 mm | 89% | 0.2 m/s | 1.1 |
| 2013 | -5.3°C | -9.1°C | -12.8°C | 4.0°C | -24.4°C | 105 mm | 93% | 0.1 m/s | 0.9 |
| 2012 | -1.3°C | -5.3°C | -9.2°C | 8.6°C | -18.4°C | 131 mm | 93% | 0.2 m/s | 1.2 |
| 2011 | 0.5°C | -3.9°C | -8.2°C | 7.6°C | -18.3°C | 109 mm | 90% | 0.2 m/s | 1.2 |
| 2010 🌧️ | 0.0°C | -3.2°C | -6.4°C | 14.5°C | -15.0°C | 194 mm | 92% | 0.2 m/s | 1 |
| 2009 | -2.9°C | -6.3°C | -9.7°C | 9.0°C | -21.6°C | 104 mm | 94% | 0.2 m/s | 1.1 |
| 2008 | -1.1°C | -5.6°C | -10.1°C | 10.0°C | -20.2°C | 170 mm | 89% | 0.2 m/s | 1.1 |
| 2007 | -4.1°C | -8.8°C | -13.4°C | 6.2°C | -22.5°C | 88 mm | 95% | 0.2 m/s | 1.2 |
| 2006 | 0.0°C | -3.7°C | -7.4°C | 10.7°C | -16.7°C | 70 mm | 89% | 0.2 m/s | 1.2 |
| 2005 | -2.1°C | -5.6°C | -9.0°C | 9.5°C | -18.8°C | 139 mm | 89% | 0.2 m/s | 1.2 |
| 2004 | -2.9°C | -7.7°C | -12.6°C | 9.5°C | -22.5°C | 93 mm | 89% | 0.2 m/s | 1.1 |
| 2003 | -0.6°C | -4.3°C | -8.0°C | 8.4°C | -15.7°C | 105 mm | 86% | 0.2 m/s | 1.2 |
| 2002 | -3.1°C | -7.0°C | -11.0°C | 4.5°C | -20.9°C | 110 mm | 92% | 0.2 m/s | 1.4 |
| 2001 | 0.8°C | -2.6°C | -6.0°C | 9.3°C | -11.3°C | 46 mm | 88% | 0.2 m/s | 1.3 |
| 2000 | -3.6°C | -7.8°C | -12.1°C | 11.5°C | -20.6°C | 95 mm | 88% | 0.2 m/s | 1.3 |
| 1999 | -1.2°C | -4.6°C | -8.0°C | 7.4°C | -19.6°C | 103 mm | 89% | 0.2 m/s | 1.1 |
| 1998 | -0.3°C | -4.3°C | -8.4°C | 10.0°C | -21.8°C | 56 mm | 86% | 0.2 m/s | 1.2 |
| 1997 | -4.0°C | -9.2°C | -14.4°C | 0.2°C | -25.8°C | 77 mm | 99% | 0.2 m/s | 1.2 |
| 1996 | 0.8°C | -2.9°C | -6.6°C | 9.3°C | -24.0°C | 167 mm | 92% | 0.2 m/s | 1.2 |
| 1995 | -5.0°C | -9.2°C | -13.3°C | 0.7°C | -22.7°C | 67 mm | 95% | 0.2 m/s | 1.4 |
| 1994 | -3.1°C | -7.5°C | -11.9°C | 4.4°C | -25.5°C | 68 mm | 96% | 0.2 m/s | 1.1 |
| 1993 | -1.5°C | -5.3°C | -9.1°C | 13.0°C | -29.1°C | 153 mm | 87% | 0.2 m/s | 0.9 |
| 1992 | -2.1°C | -5.6°C | -9.1°C | 3.5°C | -20.1°C | 72 mm | 90% | 0.2 m/s | 1.1 |
| 1991 | -4.7°C | -9.4°C | -14.0°C | 7.8°C | -24.1°C | 66 mm | 93% | 0.2 m/s | 1.2 |
| 1990 | -0.3°C | -5.0°C | -9.6°C | 11.3°C | -21.5°C | 151 mm | 91% | 0.2 m/s | 1.1 |
| 1989 ❄️ | -11.7°C | -16.5°C | -21.3°C | 0.0°C | -34.3°C | 68 mm | 99% | 0.1 m/s | 1.5 |
| 1988 | -3.7°C | -7.8°C | -11.9°C | 4.0°C | -21.2°C | 39 mm | 86% | 0.2 m/s | 1.2 |
| 1987 | -3.7°C | -7.6°C | -11.4°C | 6.0°C | -24.2°C | 96 mm | 94% | 0.2 m/s | 1.2 |
| 1986 | -2.5°C | -7.6°C | -12.7°C | 8.5°C | -22.6°C | 57 mm | 89% | 0.2 m/s | 1.2 |
| 1985 | -4.6°C | -9.6°C | -14.6°C | 8.5°C | -25.1°C | 63 mm | 91% | 0.2 m/s | 1.2 |
| 1984 | -2.1°C | -6.8°C | -11.5°C | 3.9°C | -25.5°C | 87 mm | 91% | 0.2 m/s | 1.1 |
| 1983 | -4.1°C | -8.3°C | -12.5°C | 6.6°C | -25.4°C | 132 mm | 89% | 0.2 m/s | — |
| 1982 | -0.1°C | -4.5°C | -8.8°C | 13.0°C | -21.2°C | 63 mm | 86% | 0.2 m/s | — |
| 1981 | -2.0°C | -5.3°C | -8.6°C | 4.4°C | -22.0°C | 142 mm | 97% | 0.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -2.1°C with lows near -10.3°C (mean -6.2°C), based on 45 years of NASA POWER data.
December averages 101 mm of rainfall in Fredericton, about average for rainfall. The wettest on record was 194 mm in 2010.
The hottest December reached 14.6°C in 2023. The coldest dipped to -34.3°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.6°C. Daytime highs moved from -2.6°C to -0.4°C and overnight lows from -11.2°C to -8.3°C over the same span.
December is one of the cooler months of the year in Fredericton and about average for rainfall, so plan for around -2.1°C daytime highs and -10.3°C at night.
Not quite — December is the 3rd coolest month in Fredericton, averaging -6.2°C.
For December in Fredericton, pack warm layers and a jacket for chilly mornings, with typical highs of -2.1°C and lows of -10.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 91% — quite humid.
Average wind speed in December is 0.2 m/s. The windiest December on record averaged 0.2 m/s (1982).
The wettest December on record was 2010 with 194 mm. On average, December sees 101 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 Fredericton 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.
