December is one of the cooler months of the year in Oromocto, with average highs near -1.6°C and lows around -9.9°C (mean -5.7°C). It is a relatively wet time of year, averaging 105 mm of rainfall and 90% relative humidity across the period.
December is one of the cooler months of the year in Oromocto. Across 45 years of records, the warmest December in Oromocto was 2023 — when the month averaged -1.9°C — while the coldest was 1989 at -16.1°C. Typical December days reach -1.6°C with nights near -9.9°C. The long-term trend is warming, about 0.8°C per decade.
December is a relatively wet time of year in Oromocto, averaging 105 mm of rainfall. The wettest December on record was 1990 with 191 mm, while the driest was 2001 at 43 mm.
Relative humidity in Oromocto during December averages 90%. The most humid December was 1989 at 99%, and the least humid was 2021 at 82%.
December receives about 1.2 kWh/m²/day of solar energy in Oromocto. 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 Oromocto during December is 0.4 m/s. The windiest Decembers were 2014, 2020 and 2023, among others at 0.5 m/s, while the calmest was 2013 at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -7.8°C | -5.9°C | -5.6°C | -5.2°C | -3.4°C | +4.4°C |
| Avg High | -3.3°C | -1.7°C | -1.5°C | -1.3°C | 0.5°C | +3.8°C |
| Avg Low | -12.3°C | -10.2°C | -9.6°C | -9.1°C | -7.4°C | +4.9°C |
| Avg Rain | 98 mm | 105 mm | 102 mm | 121 mm | 93 mm | -5 mm |
December temperatures in Oromocto have risen by about 2.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -33.6°C (1989) to a record high of 14.8°C (2023).
Rainfall in December is a relatively wet time of year, averaging 105 mm, with a wettest year of 191 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.9°C per decade, narrowing the gap between day and night.
A quieter season to visit Oromocto
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Oromocto. That said, December — with days averaging -1.6°C and nights around -9.9°C (mean -5.7°C) and higher rainfall (105 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 | -2.9°C | -7.1°C | -11.4°C | 12.4°C | -19.6°C | 69 mm | 83% | 0.4 m/s | — |
| 2024 | -0.1°C | -4.0°C | -7.8°C | 12.5°C | -17.5°C | 69 mm | 88% | 0.4 m/s | 1.3 |
| 2023 🔥 | 1.9°C | -1.9°C | -5.6°C | 14.8°C | -12.8°C | 98 mm | 88% | 0.5 m/s | 1.2 |
| 2022 | 1.5°C | -2.2°C | -5.9°C | 9.9°C | -13.7°C | 110 mm | 88% | 0.4 m/s | 1.1 |
| 2021 | 0.9°C | -3.4°C | -7.7°C | 11.7°C | -16.5°C | 69 mm | 82% | 0.4 m/s | 1.2 |
| 2020 | 1.7°C | -2.1°C | -5.8°C | 14.4°C | -18.8°C | 142 mm | 90% | 0.5 m/s | 1.1 |
| 2019 | -0.4°C | -4.7°C | -8.9°C | 10.7°C | -17.7°C | 92 mm | 87% | 0.4 m/s | 1.2 |
| 2018 | -3.5°C | -7.9°C | -12.3°C | 10.1°C | -22.5°C | 93 mm | 92% | 0.4 m/s | 1.4 |
| 2017 | -4.3°C | -8.4°C | -12.4°C | 7.8°C | -26.0°C | 96 mm | 91% | 0.4 m/s | 1.2 |
| 2016 | -3.2°C | -7.5°C | -11.8°C | 2.7°C | -28.8°C | 88 mm | 94% | 0.4 m/s | 1.2 |
| 2015 | 1.0°C | -2.0°C | -4.9°C | 7.4°C | -15.9°C | 135 mm | 94% | 0.4 m/s | 1.1 |
| 2014 | 0.7°C | -2.8°C | -6.4°C | 10.6°C | -19.4°C | 153 mm | 87% | 0.5 m/s | 1.1 |
| 2013 | -4.8°C | -8.7°C | -12.6°C | 4.1°C | -24.9°C | 127 mm | 92% | 0.3 m/s | 0.9 |
| 2012 | -0.7°C | -4.6°C | -8.6°C | 8.8°C | -17.5°C | 132 mm | 91% | 0.5 m/s | 1.2 |
| 2011 | 1.2°C | -3.1°C | -7.4°C | 8.8°C | -17.3°C | 111 mm | 88% | 0.4 m/s | 1.2 |
| 2010 | 0.8°C | -2.4°C | -5.6°C | 13.6°C | -15.8°C | 177 mm | 91% | 0.5 m/s | 1 |
| 2009 | -2.4°C | -5.7°C | -9.1°C | 9.5°C | -21.7°C | 109 mm | 94% | 0.5 m/s | 1.1 |
| 2008 | -0.3°C | -4.9°C | -9.4°C | 10.7°C | -20.2°C | 174 mm | 87% | 0.5 m/s | 1.1 |
| 2007 | -3.9°C | -8.7°C | -13.5°C | 6.8°C | -24.0°C | 97 mm | 95% | 0.5 m/s | 1.2 |
| 2006 | 0.2°C | -3.5°C | -7.3°C | 11.1°C | -17.3°C | 81 mm | 89% | 0.4 m/s | 1.2 |
| 2005 | -1.7°C | -5.1°C | -8.4°C | 9.4°C | -17.2°C | 112 mm | 89% | 0.4 m/s | 1.2 |
| 2004 | -2.3°C | -7.2°C | -12.1°C | 9.7°C | -20.8°C | 95 mm | 88% | 0.4 m/s | 1.1 |
| 2003 | -0.2°C | -4.0°C | -7.7°C | 8.7°C | -15.2°C | 105 mm | 86% | 0.5 m/s | 1.2 |
| 2002 | -2.7°C | -6.8°C | -10.9°C | 5.2°C | -20.7°C | 103 mm | 91% | 0.4 m/s | 1.4 |
| 2001 | 1.2°C | -2.3°C | -5.8°C | 10.8°C | -11.6°C | 43 mm | 87% | 0.4 m/s | 1.3 |
| 2000 | -3.3°C | -7.7°C | -12.1°C | 11.4°C | -20.6°C | 106 mm | 88% | 0.5 m/s | 1.3 |
| 1999 | -0.6°C | -4.1°C | -7.6°C | 8.8°C | -18.5°C | 107 mm | 88% | 0.5 m/s | 1.1 |
| 1998 | 0.0°C | -4.3°C | -8.5°C | 10.1°C | -21.5°C | 63 mm | 86% | 0.4 m/s | 1.2 |
| 1997 | -3.5°C | -8.8°C | -14.1°C | 0.5°C | -25.7°C | 75 mm | 99% | 0.4 m/s | 1.2 |
| 1996 | 1.2°C | -2.4°C | -6.0°C | 9.3°C | -24.3°C | 153 mm | 90% | 0.5 m/s | 1.2 |
| 1995 | -4.3°C | -8.4°C | -12.5°C | 1.3°C | -21.5°C | 72 mm | 93% | 0.4 m/s | 1.4 |
| 1994 | -2.7°C | -7.1°C | -11.5°C | 4.3°C | -23.1°C | 75 mm | 95% | 0.4 m/s | 1.1 |
| 1993 | -1.2°C | -4.9°C | -8.6°C | 12.9°C | -29.8°C | 147 mm | 87% | 0.5 m/s | 0.9 |
| 1992 | -1.9°C | -5.5°C | -9.1°C | 3.7°C | -20.7°C | 87 mm | 91% | 0.4 m/s | 1.1 |
| 1991 | -4.1°C | -9.2°C | -14.3°C | 8.3°C | -25.9°C | 76 mm | 93% | 0.4 m/s | 1.2 |
| 1990 🌧️ | 0.2°C | -4.6°C | -9.4°C | 11.7°C | -21.0°C | 191 mm | 90% | 0.5 m/s | 1.1 |
| 1989 ❄️ | -11.1°C | -16.1°C | -21.1°C | 0.0°C | -33.6°C | 76 mm | 99% | 0.4 m/s | 1.5 |
| 1988 | -3.3°C | -7.5°C | -11.8°C | 4.5°C | -21.5°C | 49 mm | 85% | 0.4 m/s | 1.2 |
| 1987 | -3.5°C | -7.6°C | -11.7°C | 6.8°C | -26.4°C | 126 mm | 95% | 0.4 m/s | 1.2 |
| 1986 | -2.0°C | -7.2°C | -12.4°C | 9.2°C | -22.8°C | 63 mm | 89% | 0.4 m/s | 1.2 |
| 1985 | -4.3°C | -9.4°C | -14.6°C | 9.0°C | -27.4°C | 74 mm | 91% | 0.4 m/s | 1.2 |
| 1984 | -1.5°C | -6.2°C | -11.0°C | 5.4°C | -26.1°C | 101 mm | 90% | 0.4 m/s | 1.1 |
| 1983 | -3.2°C | -7.5°C | -11.8°C | 7.7°C | -25.3°C | 136 mm | 87% | 0.4 m/s | — |
| 1982 | 0.1°C | -4.2°C | -8.6°C | 12.7°C | -22.4°C | 79 mm | 86% | 0.5 m/s | — |
| 1981 | -1.2°C | -4.7°C | -8.1°C | 6.7°C | -22.0°C | 172 mm | 96% | 0.4 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 -9.9°C (mean -5.7°C), based on 45 years of NASA POWER data.
December averages 105 mm of rainfall in Oromocto, a relatively wet time of year. The wettest on record was 191 mm in 1990.
The hottest December reached 14.8°C in 2023. The coldest dipped to -33.6°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.7°C. Daytime highs moved from -2°C to 0.3°C and overnight lows from -10.8°C to -7.7°C over the same span.
December is one of the cooler months of the year in Oromocto and a relatively wet time of year, so plan for around -1.6°C daytime highs and -9.9°C at night.
Not quite — December is the 3rd coolest month in Oromocto, averaging -5.7°C.
For December in Oromocto, pack warm layers and a jacket for chilly mornings, with typical highs of -1.6°C and lows of -9.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 90% — quite humid.
Average wind speed in December is 0.4 m/s. The windiest December on record averaged 0.5 m/s (1982).
The wettest December on record was 1990 with 191 mm. On average, December sees 105 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 Oromocto 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.
