December is one of the cooler months of the year in Antrim, with average highs near 6.8°C and lows around 3.2°C (mean 5°C). It is a relatively wet time of year, averaging 99 mm of rainfall and 94% relative humidity across the period.
December is one of the cooler months of the year in Antrim. Across 45 years of records, the warmest December in Antrim was 2015 — when the month averaged 7.1°C — while the coldest was 2010 at 0.9°C. Typical December days reach 6.8°C with nights near 3.2°C. The long-term trend is warming, about 0.3°C per decade.
December is a relatively wet time of year in Antrim, averaging 99 mm of rainfall. The wettest December on record was 2015 with 183 mm, while the driest was 2010 at 46 mm.
Relative humidity in Antrim during December averages 94%. The most humid December was 2019 at 96%, and the least humid was 1995 at 90%.
December receives about 0.4 kWh/m²/day of solar energy in Antrim. The sunniest Decembers were 2019, 2020 and 2022, among others at 0.5 kWh/m²/day, and the cloudiest were 2021, 2023 and 2024, among others at 0.4.
Average wind speed in Antrim during December is 4.4 m/s. The windiest December was 2013 at 5.8 m/s, while the calmest was 2010 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 4.8°C | 4.6°C | 5.1°C | 5.0°C | 5.7°C | +0.9°C |
| Avg High | 6.7°C | 6.4°C | 6.9°C | 7.0°C | 7.4°C | +0.7°C |
| Avg Low | 3.0°C | 2.7°C | 3.3°C | 3.1°C | 4.0°C | +1°C |
| Avg Rain | 95 mm | 96 mm | 95 mm | 101 mm | 111 mm | +16 mm |
December temperatures in Antrim have risen by about 1.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -5.7°C (1981) to a record high of 13.2°C (2016).
Rainfall in December is a relatively wet time of year, averaging 99 mm, with a wettest year of 183 mm.
A quieter season to visit Antrim
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Antrim. That said, December — with days averaging 6.8°C and nights around 3.2°C (mean 5°C) and higher rainfall (99 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 | 7.8°C | 6.1°C | 4.4°C | 13.1°C | -1.0°C | 114 mm | 95% | 4.2 m/s | — |
| 2024 | 8.6°C | 6.5°C | 4.5°C | 11.9°C | 0.9°C | 93 mm | 94% | 4.7 m/s | 0.4 |
| 2023 | 8.1°C | 6.6°C | 5.1°C | 11.5°C | 0.7°C | 142 mm | 94% | 5.1 m/s | 0.4 |
| 2022 | 5.7°C | 3.9°C | 2.1°C | 12.3°C | -1.3°C | 89 mm | 94% | 3.7 m/s | 0.5 |
| 2021 | 7.8°C | 6.1°C | 4.5°C | 11.7°C | 1.3°C | 127 mm | 95% | 4.1 m/s | 0.4 |
| 2020 | 6.5°C | 4.9°C | 3.3°C | 11.1°C | 0.4°C | 102 mm | 95% | 4.4 m/s | 0.5 |
| 2019 | 7.1°C | 5.2°C | 3.3°C | 12.0°C | -0.6°C | 93 mm | 96% | 4.5 m/s | 0.5 |
| 2018 | 8.2°C | 6.5°C | 4.9°C | 11.2°C | 0.7°C | 107 mm | 95% | 4.3 m/s | 0.4 |
| 2017 | 6.6°C | 4.7°C | 2.9°C | 12.0°C | -1.6°C | 90 mm | 95% | 4.1 m/s | 0.4 |
| 2016 | 7.9°C | 6.0°C | 4.2°C | 13.2°C | 0.6°C | 71 mm | 95% | 4.1 m/s | 0.5 |
| 2015 🔥 🌧️ | 9.6°C | 7.1°C | 4.5°C | 12.9°C | 0.1°C | 183 mm | 94% | 5.6 m/s | 0.4 |
| 2014 | 6.3°C | 4.5°C | 2.7°C | 11.2°C | -0.8°C | 93 mm | 95% | 4.6 m/s | 0.5 |
| 2013 | 7.8°C | 5.7°C | 3.5°C | 12.5°C | 0.0°C | 92 mm | 94% | 5.8 m/s | 0.4 |
| 2012 | 6.4°C | 4.5°C | 2.6°C | 11.0°C | 0.2°C | 132 mm | 95% | 4.2 m/s | 0.5 |
| 2011 | 6.9°C | 5.0°C | 3.2°C | 11.6°C | -0.4°C | 104 mm | 94% | 5.6 m/s | 0.4 |
| 2010 ❄️ | 2.8°C | 0.9°C | -0.9°C | 8.2°C | -4.8°C | 46 mm | 93% | 2.7 m/s | 0.5 |
| 2009 | 5.0°C | 3.3°C | 1.6°C | 10.1°C | -1.1°C | 71 mm | 94% | 3.6 m/s | 0.5 |
| 2008 | 6.0°C | 4.0°C | 2.0°C | 10.8°C | -0.8°C | 73 mm | 94% | 3.5 m/s | 0.5 |
| 2007 | 7.8°C | 5.7°C | 3.5°C | 12.7°C | 0.4°C | 101 mm | 94% | 4.7 m/s | 0.4 |
| 2006 | 8.0°C | 6.2°C | 4.3°C | 11.7°C | 1.7°C | 119 mm | 95% | 4.9 m/s | 0.4 |
| 2005 | 7.4°C | 5.7°C | 4.0°C | 10.7°C | -0.3°C | 93 mm | 94% | 3.6 m/s | 0.4 |
| 2004 | 7.8°C | 5.9°C | 4.0°C | 10.9°C | -0.3°C | 77 mm | 94% | 4.7 m/s | 0.4 |
| 2003 | 7.3°C | 5.4°C | 3.5°C | 11.1°C | -1.0°C | 100 mm | 93% | 4 m/s | 0.4 |
| 2002 | 6.6°C | 5.4°C | 4.2°C | 10.9°C | 0.3°C | 93 mm | 93% | 4 m/s | 0.4 |
| 2001 | 6.5°C | 4.4°C | 2.4°C | 11.2°C | -2.0°C | 65 mm | 94% | 3.9 m/s | 0.5 |
| 2000 | 6.6°C | 5.1°C | 3.7°C | 11.2°C | -2.5°C | 160 mm | 95% | 4.4 m/s | 0.4 |
| 1999 | 6.3°C | 4.4°C | 2.5°C | 11.1°C | -0.9°C | 150 mm | 93% | 5.2 m/s | 0.4 |
| 1998 | 7.7°C | 5.6°C | 3.4°C | 12.0°C | -0.7°C | 101 mm | 94% | 4.8 m/s | 0.4 |
| 1997 | 7.5°C | 6.0°C | 4.4°C | 11.6°C | -0.2°C | 119 mm | 94% | 4.7 m/s | 0.4 |
| 1996 | 5.1°C | 3.5°C | 1.9°C | 9.4°C | -1.3°C | 54 mm | 93% | 3.7 m/s | 0.5 |
| 1995 | 5.0°C | 3.4°C | 1.8°C | 11.8°C | -3.4°C | 61 mm | 90% | 3.7 m/s | 0.4 |
| 1994 | 7.7°C | 5.8°C | 4.0°C | 13.1°C | 0.1°C | 114 mm | 94% | 5.3 m/s | 0.4 |
| 1993 | 6.2°C | 4.2°C | 2.2°C | 11.6°C | -1.4°C | 140 mm | 94% | 5.2 m/s | 0.4 |
| 1992 | 5.7°C | 3.9°C | 2.1°C | 9.3°C | -1.1°C | 79 mm | 95% | 3.9 m/s | 0.5 |
| 1991 | 7.3°C | 5.5°C | 3.7°C | 11.6°C | -0.7°C | 57 mm | 94% | 4.1 m/s | 0.5 |
| 1990 | 5.7°C | 3.5°C | 1.4°C | 10.8°C | -0.7°C | 87 mm | 93% | 4.5 m/s | 0.4 |
| 1989 | 6.1°C | 4.3°C | 2.4°C | 10.7°C | -0.3°C | 75 mm | 93% | 3.6 m/s | 0.5 |
| 1988 | 8.7°C | 6.8°C | 5.0°C | 11.2°C | 1.3°C | 65 mm | 95% | 4.7 m/s | 0.4 |
| 1987 | 7.5°C | 5.9°C | 4.2°C | 11.7°C | -0.5°C | 69 mm | 93% | 4.2 m/s | 0.4 |
| 1986 | 6.9°C | 4.6°C | 2.2°C | 11.7°C | -0.6°C | 140 mm | 94% | 5.2 m/s | 0.4 |
| 1985 | 7.2°C | 5.5°C | 3.8°C | 12.8°C | -2.3°C | 88 mm | 94% | 4.4 m/s | 0.4 |
| 1984 | 6.7°C | 4.9°C | 3.0°C | 10.7°C | -1.4°C | 102 mm | 95% | 4 m/s | 0.4 |
| 1983 | 7.7°C | 5.9°C | 4.1°C | 11.0°C | 0.5°C | 123 mm | 93% | 4.9 m/s | — |
| 1982 | 5.7°C | 3.7°C | 1.7°C | 10.7°C | -0.9°C | 120 mm | 94% | 4.6 m/s | — |
| 1981 | 3.6°C | 1.9°C | 0.2°C | 10.2°C | -5.7°C | 75 mm | 92% | 3.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 6.8°C with lows near 3.2°C (mean 5°C), based on 45 years of NASA POWER data.
December averages 99 mm of rainfall in Antrim, a relatively wet time of year. The wettest on record was 183 mm in 2015.
The hottest December reached 13.2°C in 2016. The coldest dipped to -5.7°C in 1981.
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 6.2°C to 7.6°C and overnight lows from 2.6°C to 4.1°C over the same span.
December is one of the cooler months of the year in Antrim and a relatively wet time of year, so plan for around 6.8°C daytime highs and 3.2°C at night.
Not quite — December is the 3rd coolest month in Antrim, averaging 5°C.
For December in Antrim, pack warm layers and a jacket for chilly mornings, with typical highs of 6.8°C and lows of 3.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 94% — quite humid.
Average wind speed in December is 4.4 m/s. The windiest December on record averaged 5.8 m/s (2013).
The wettest December on record was 2015 with 183 mm. On average, December sees 99 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 Antrim 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.
