December is one of the cooler months of the year in Bangor, with average highs near 8.4°C and lows around 5.9°C (mean 7.2°C). It is a relatively wet time of year, averaging 143 mm of rainfall and 87% relative humidity across the period.
December is one of the cooler months of the year in Bangor. Across 45 years of records, the warmest December in Bangor was 2015 — when the month averaged 9.9°C — while the coldest was 2010 at 3.6°C. Typical December days reach 8.4°C with nights near 5.9°C. The long-term trend is warming, about 0.4°C per decade.
December is a relatively wet time of year in Bangor, averaging 143 mm of rainfall. The wettest December on record was 2015 with 337 mm, while the driest was 1996 at 50 mm.
Relative humidity in Bangor during December averages 87%. The most humid December was 2018 at 90%, and the least humid was 1990 at 84%.
December receives about 0.5 kWh/m²/day of solar energy in Bangor. The sunniest December was 2001 at 0.6 kWh/m²/day, and the cloudiest were 2016, 2018 and 2024, among others at 0.4.
Average wind speed in Bangor during December is 6.2 m/s. The windiest December was 2015 at 8.3 m/s, while the calmest was 2010 at 4.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.8°C | 6.6°C | 7.1°C | 7.6°C | 7.8°C | +1°C |
| Avg High | 8.0°C | 7.9°C | 8.3°C | 8.8°C | 9.0°C | +1°C |
| Avg Low | 5.6°C | 5.3°C | 5.9°C | 6.4°C | 6.8°C | +1.2°C |
| Avg Rain | 125 mm | 132 mm | 125 mm | 162 mm | 190 mm | +64 mm |
December temperatures in Bangor have risen by about 1.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -1.3°C (1995) to a record high of 13.5°C (2025).
Rainfall in December is a relatively wet time of year, averaging 143 mm, with a wettest year of 337 mm.
A quieter season to visit Bangor
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Bangor. That said, December — with days averaging 8.4°C and nights around 5.9°C (mean 7.2°C) and higher rainfall (143 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 | 9.3°C | 8.4°C | 7.4°C | 13.5°C | 3.4°C | 200 mm | 87% | 6.3 m/s | — |
| 2024 | 9.6°C | 8.4°C | 7.2°C | 12.5°C | 3.6°C | 207 mm | 89% | 6.4 m/s | 0.4 |
| 2023 | 9.6°C | 8.5°C | 7.5°C | 11.8°C | 3.0°C | 201 mm | 87% | 7 m/s | 0.5 |
| 2022 | 7.7°C | 6.6°C | 5.5°C | 12.5°C | 1.3°C | 127 mm | 86% | 5.3 m/s | 0.5 |
| 2021 | 9.1°C | 7.9°C | 6.7°C | 12.2°C | 3.3°C | 164 mm | 89% | 5.9 m/s | 0.5 |
| 2020 | 8.4°C | 7.3°C | 6.2°C | 12.3°C | 3.4°C | 237 mm | 87% | 6.2 m/s | 0.5 |
| 2019 | 9.1°C | 7.8°C | 6.6°C | 12.3°C | 3.3°C | 124 mm | 88% | 6.3 m/s | 0.5 |
| 2018 | 9.5°C | 8.5°C | 7.4°C | 12.0°C | 2.3°C | 184 mm | 90% | 5.9 m/s | 0.4 |
| 2017 | 8.4°C | 7.2°C | 6.1°C | 12.2°C | 2.3°C | 143 mm | 88% | 6.1 m/s | 0.5 |
| 2016 | 9.6°C | 8.4°C | 7.2°C | 12.4°C | 3.5°C | 88 mm | 90% | 5.2 m/s | 0.4 |
| 2015 🔥 🌧️ | 11.5°C | 9.9°C | 8.3°C | 13.3°C | 4.9°C | 337 mm | 88% | 8.3 m/s | 0.4 |
| 2014 | 8.7°C | 7.6°C | 6.5°C | 11.6°C | 3.6°C | 140 mm | 85% | 6.7 m/s | 0.5 |
| 2013 | 9.7°C | 8.3°C | 6.9°C | 12.0°C | 4.7°C | 127 mm | 85% | 7.7 m/s | 0.5 |
| 2012 | 8.1°C | 6.8°C | 5.5°C | 11.1°C | 1.4°C | 224 mm | 87% | 6.3 m/s | 0.5 |
| 2011 | 9.1°C | 7.8°C | 6.5°C | 11.4°C | 3.6°C | 189 mm | 85% | 7.7 m/s | 0.4 |
| 2010 ❄️ | 4.7°C | 3.6°C | 2.6°C | 8.2°C | -0.9°C | 60 mm | 86% | 4.3 m/s | 0.5 |
| 2009 | 7.0°C | 5.9°C | 4.7°C | 11.6°C | 1.2°C | 130 mm | 86% | 5.6 m/s | 0.5 |
| 2008 | 7.4°C | 6.2°C | 4.9°C | 10.7°C | 0.9°C | 90 mm | 87% | 5.1 m/s | 0.5 |
| 2007 | 8.6°C | 7.2°C | 5.9°C | 12.7°C | 1.7°C | 139 mm | 88% | 6.7 m/s | 0.5 |
| 2006 | 9.9°C | 8.5°C | 7.1°C | 12.7°C | 2.4°C | 193 mm | 86% | 6.8 m/s | 0.5 |
| 2005 | 8.7°C | 7.6°C | 6.6°C | 11.1°C | 1.7°C | 95 mm | 88% | 5.3 m/s | 0.5 |
| 2004 | 9.3°C | 8.1°C | 6.9°C | 11.4°C | 3.6°C | 111 mm | 88% | 6 m/s | 0.5 |
| 2003 | 8.6°C | 7.1°C | 5.6°C | 11.9°C | 1.4°C | 123 mm | 89% | 5.7 m/s | 0.5 |
| 2002 | 7.7°C | 6.7°C | 5.7°C | 11.4°C | 2.4°C | 133 mm | 90% | 5.9 m/s | 0.5 |
| 2001 | 7.8°C | 6.3°C | 4.8°C | 12.4°C | 2.4°C | 73 mm | 86% | 5.7 m/s | 0.6 |
| 2000 | 8.3°C | 7.3°C | 6.3°C | 12.4°C | 0.4°C | 166 mm | 87% | 6.7 m/s | 0.4 |
| 1999 | 8.3°C | 7.0°C | 5.7°C | 11.3°C | 2.2°C | 211 mm | 85% | 7.7 m/s | 0.5 |
| 1998 | 9.2°C | 7.7°C | 6.3°C | 12.0°C | 2.5°C | 112 mm | 87% | 6.4 m/s | 0.4 |
| 1997 | 9.0°C | 7.8°C | 6.6°C | 12.4°C | 1.3°C | 156 mm | 88% | 6.6 m/s | 0.4 |
| 1996 | 6.4°C | 5.0°C | 3.6°C | 10.8°C | 0.4°C | 50 mm | 88% | 5.5 m/s | 0.4 |
| 1995 | 5.9°C | 4.6°C | 3.3°C | 12.2°C | -1.3°C | 87 mm | 86% | 5.4 m/s | 0.5 |
| 1994 | 9.8°C | 8.4°C | 7.0°C | 12.5°C | 3.1°C | 177 mm | 86% | 7.3 m/s | 0.5 |
| 1993 | 8.0°C | 6.6°C | 5.2°C | 11.4°C | 2.2°C | 199 mm | 87% | 7.6 m/s | 0.5 |
| 1992 | 7.2°C | 6.0°C | 4.7°C | 11.2°C | 0.7°C | 111 mm | 86% | 5.4 m/s | 0.5 |
| 1991 | 8.0°C | 6.7°C | 5.4°C | 12.1°C | 1.7°C | 60 mm | 88% | 5.4 m/s | 0.5 |
| 1990 | 7.5°C | 6.1°C | 4.7°C | 10.9°C | 1.4°C | 151 mm | 84% | 6.4 m/s | 0.4 |
| 1989 | 7.2°C | 5.9°C | 4.6°C | 11.1°C | 2.0°C | 132 mm | 87% | 5.5 m/s | 0.5 |
| 1988 | 9.7°C | 8.6°C | 7.5°C | 11.3°C | 2.9°C | 79 mm | 89% | 6 m/s | 0.5 |
| 1987 | 7.7°C | 6.6°C | 5.6°C | 11.3°C | 0.6°C | 76 mm | 90% | 6 m/s | 0.4 |
| 1986 | 8.7°C | 7.3°C | 5.8°C | 13.1°C | 3.3°C | 201 mm | 86% | 7.5 m/s | 0.5 |
| 1985 | 8.7°C | 7.6°C | 6.5°C | 13.3°C | 0.6°C | 150 mm | 88% | 6.2 m/s | 0.5 |
| 1984 | 8.5°C | 7.3°C | 6.0°C | 10.8°C | 2.6°C | 137 mm | 88% | 5.7 m/s | 0.5 |
| 1983 | 9.1°C | 7.8°C | 6.5°C | 11.9°C | 3.4°C | 145 mm | 88% | 6.8 m/s | — |
| 1982 | 7.8°C | 6.3°C | 4.9°C | 11.1°C | 2.0°C | 125 mm | 87% | 6.6 m/s | — |
| 1981 | 5.0°C | 3.8°C | 2.6°C | 9.9°C | -0.9°C | 81 mm | 86% | 5.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 8.4°C with lows near 5.9°C (mean 7.2°C), based on 45 years of NASA POWER data.
December averages 143 mm of rainfall in Bangor, a relatively wet time of year. The wettest on record was 337 mm in 2015.
The hottest December reached 13.5°C in 2025. The coldest dipped to -1.3°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.4°C. Daytime highs moved from 7.8°C to 9.1°C and overnight lows from 5.3°C to 6.9°C over the same span.
December is one of the cooler months of the year in Bangor and a relatively wet time of year, so plan for around 8.4°C daytime highs and 5.9°C at night.
Not quite — December is the 4th coolest month in Bangor, averaging 7.2°C.
For December in Bangor, pack warm layers and a jacket for chilly mornings, with typical highs of 8.4°C and lows of 5.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 87% — quite humid.
Average wind speed in December is 6.2 m/s. The windiest December on record averaged 8.3 m/s (2015).
The wettest December on record was 2015 with 337 mm. On average, December sees 143 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 Bangor 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.
