December is one of the cooler months of the year in Larne, with average highs near 8.4°C and lows around 6°C (mean 7.2°C). It is a relatively wet time of year, averaging 117 mm of rainfall and 87% relative humidity across the period.
December is one of the cooler months of the year in Larne. Across 45 years of records, the warmest December in Larne was 2015 — when the month averaged 8.8°C — while the coldest was 2010 at 4.5°C. Typical December days reach 8.4°C with nights near 6°C. The long-term trend is warming, about 0.3°C per decade.
December is a relatively wet time of year in Larne, averaging 117 mm of rainfall. The wettest December on record was 1999 with 208 mm, while the driest was 2010 at 51 mm.
Relative humidity in Larne during December averages 87%. The most humid December was 2018 at 90%, and the least humid was 1981 at 83%.
December receives about 0.4 kWh/m²/day of solar energy in Larne. The sunniest Decembers were 2010, 2020 and 2022, among others at 0.5 kWh/m²/day, and the cloudiest was 2021 at 0.3.
Average wind speed in Larne during December is 6.9 m/s. The windiest December was 2013 at 8.7 m/s, while the calmest was 2010 at 5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.9°C | 6.7°C | 7.4°C | 7.3°C | 7.8°C | +0.9°C |
| Avg High | 8.1°C | 8.0°C | 8.5°C | 8.5°C | 8.9°C | +0.8°C |
| Avg Low | 5.8°C | 5.5°C | 6.3°C | 6.1°C | 6.7°C | +0.9°C |
| Avg Rain | 108 mm | 119 mm | 114 mm | 121 mm | 126 mm | +18 mm |
December temperatures in Larne have risen by about 1.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 0°C (1981) to a record high of 13.2°C (1994).
Rainfall in December is a relatively wet time of year, averaging 117 mm, with a wettest year of 208 mm.
A quieter season to visit Larne
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Larne. That said, December — with days averaging 8.4°C and nights around 6°C (mean 7.2°C) and higher rainfall (117 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 | 9.2°C | 8.1°C | 7.0°C | 13.1°C | 4.7°C | 126 mm | 89% | 6.5 m/s | — |
| 2024 | 9.8°C | 8.6°C | 7.3°C | 12.6°C | 4.1°C | 105 mm | 88% | 7.1 m/s | 0.4 |
| 2023 | 9.4°C | 8.4°C | 7.4°C | 12.1°C | 3.9°C | 168 mm | 88% | 7.5 m/s | 0.4 |
| 2022 | 7.7°C | 6.7°C | 5.6°C | 12.7°C | 3.2°C | 101 mm | 87% | 6.1 m/s | 0.5 |
| 2021 | 9.0°C | 7.8°C | 6.7°C | 11.9°C | 4.2°C | 137 mm | 89% | 6.3 m/s | 0.3 |
| 2020 | 8.4°C | 7.4°C | 6.4°C | 11.7°C | 4.1°C | 119 mm | 87% | 6.8 m/s | 0.5 |
| 2019 | 8.8°C | 7.6°C | 6.4°C | 12.5°C | 4.1°C | 115 mm | 90% | 7 m/s | 0.4 |
| 2018 | 9.3°C | 8.2°C | 7.0°C | 11.7°C | 3.5°C | 108 mm | 90% | 6.5 m/s | 0.4 |
| 2017 | 8.2°C | 7.1°C | 5.9°C | 12.2°C | 2.5°C | 112 mm | 88% | 6.4 m/s | 0.4 |
| 2016 | 9.6°C | 8.4°C | 7.3°C | 13.1°C | 5.5°C | 78 mm | 89% | 6.6 m/s | 0.4 |
| 2015 🔥 | 10.5°C | 8.8°C | 7.0°C | 12.6°C | 4.4°C | 178 mm | 89% | 8.2 m/s | 0.4 |
| 2014 | 8.2°C | 7.2°C | 6.1°C | 11.7°C | 3.6°C | 127 mm | 86% | 7.3 m/s | 0.4 |
| 2013 | 9.1°C | 7.6°C | 6.2°C | 11.8°C | 3.8°C | 113 mm | 89% | 8.7 m/s | 0.4 |
| 2012 | 7.9°C | 6.7°C | 5.5°C | 11.1°C | 4.1°C | 168 mm | 88% | 6.7 m/s | 0.4 |
| 2011 | 8.4°C | 7.1°C | 5.8°C | 11.8°C | 2.7°C | 159 mm | 88% | 8.5 m/s | 0.4 |
| 2010 ❄️ | 5.5°C | 4.5°C | 3.6°C | 9.2°C | 0.8°C | 51 mm | 84% | 5 m/s | 0.5 |
| 2009 | 7.2°C | 6.1°C | 5.0°C | 11.4°C | 2.4°C | 91 mm | 86% | 5.8 m/s | 0.5 |
| 2008 | 7.8°C | 6.5°C | 5.3°C | 11.4°C | 3.1°C | 92 mm | 86% | 5.9 m/s | 0.4 |
| 2007 | 9.2°C | 7.9°C | 6.6°C | 13.2°C | 4.1°C | 110 mm | 88% | 7.2 m/s | 0.4 |
| 2006 | 9.6°C | 8.2°C | 6.8°C | 12.6°C | 3.7°C | 145 mm | 89% | 7.4 m/s | 0.4 |
| 2005 | 9.0°C | 7.9°C | 6.9°C | 11.6°C | 3.0°C | 113 mm | 87% | 6 m/s | 0.4 |
| 2004 | 9.2°C | 8.0°C | 6.8°C | 11.4°C | 3.7°C | 103 mm | 88% | 7.3 m/s | 0.4 |
| 2003 | 8.9°C | 7.8°C | 6.6°C | 11.6°C | 3.2°C | 121 mm | 86% | 6.4 m/s | 0.4 |
| 2002 | 8.0°C | 7.3°C | 6.6°C | 11.6°C | 4.2°C | 87 mm | 86% | 6.4 m/s | 0.4 |
| 2001 | 8.2°C | 7.0°C | 5.7°C | 12.1°C | 2.3°C | 85 mm | 86% | 6.5 m/s | 0.5 |
| 2000 | 8.2°C | 7.2°C | 6.2°C | 11.6°C | 1.0°C | 189 mm | 88% | 6.8 m/s | 0.4 |
| 1999 🌧️ | 8.0°C | 6.6°C | 5.3°C | 11.7°C | 2.8°C | 208 mm | 86% | 8 m/s | 0.4 |
| 1998 | 9.1°C | 7.5°C | 6.0°C | 12.1°C | 3.0°C | 110 mm | 88% | 7.2 m/s | 0.4 |
| 1997 | 8.9°C | 7.8°C | 6.7°C | 12.4°C | 4.0°C | 137 mm | 89% | 7.1 m/s | 0.4 |
| 1996 | 6.8°C | 5.8°C | 4.9°C | 10.3°C | 2.5°C | 69 mm | 86% | 6.2 m/s | 0.4 |
| 1995 | 6.5°C | 5.6°C | 4.7°C | 12.5°C | 1.3°C | 59 mm | 84% | 6.3 m/s | 0.4 |
| 1994 | 8.9°C | 7.6°C | 6.3°C | 13.2°C | 2.9°C | 145 mm | 87% | 7.8 m/s | 0.4 |
| 1993 | 7.5°C | 6.2°C | 4.8°C | 11.3°C | 1.7°C | 182 mm | 87% | 7.9 m/s | 0.4 |
| 1992 | 7.5°C | 6.4°C | 5.2°C | 10.0°C | 3.0°C | 97 mm | 88% | 6.3 m/s | 0.4 |
| 1991 | 8.8°C | 7.6°C | 6.4°C | 11.8°C | 3.9°C | 77 mm | 87% | 6.4 m/s | 0.4 |
| 1990 | 7.7°C | 6.3°C | 4.9°C | 10.9°C | 2.0°C | 105 mm | 85% | 7.1 m/s | 0.4 |
| 1989 | 7.8°C | 6.7°C | 5.7°C | 11.6°C | 3.4°C | 74 mm | 85% | 5.8 m/s | 0.4 |
| 1988 | 9.6°C | 8.5°C | 7.3°C | 11.4°C | 4.4°C | 76 mm | 89% | 7.4 m/s | 0.4 |
| 1987 | 8.5°C | 7.5°C | 6.5°C | 11.5°C | 4.1°C | 81 mm | 87% | 6.4 m/s | 0.4 |
| 1986 | 8.3°C | 6.8°C | 5.2°C | 11.9°C | 3.4°C | 185 mm | 87% | 7.8 m/s | 0.4 |
| 1985 | 8.4°C | 7.2°C | 6.1°C | 12.7°C | 0.4°C | 99 mm | 88% | 6.5 m/s | 0.4 |
| 1984 | 8.3°C | 7.1°C | 5.8°C | 11.1°C | 1.8°C | 116 mm | 88% | 6.5 m/s | 0.4 |
| 1983 | 8.9°C | 7.8°C | 6.7°C | 11.7°C | 4.3°C | 126 mm | 88% | 7.3 m/s | — |
| 1982 | 7.6°C | 6.3°C | 5.0°C | 11.3°C | 2.7°C | 147 mm | 86% | 7.3 m/s | — |
| 1981 | 5.7°C | 4.6°C | 3.6°C | 10.7°C | 0.0°C | 69 mm | 83% | 6.2 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 6°C (mean 7.2°C), based on 45 years of NASA POWER data.
December averages 117 mm of rainfall in Larne, a relatively wet time of year. The wettest on record was 208 mm in 1999.
The hottest December reached 13.2°C in 1994. The coldest dipped to 0°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.3°C. Daytime highs moved from 7.8°C to 9°C and overnight lows from 5.4°C to 6.8°C over the same span.
December is one of the cooler months of the year in Larne and a relatively wet time of year, so plan for around 8.4°C daytime highs and 6°C at night.
Not quite — December is the 4th coolest month in Larne, averaging 7.2°C.
For December in Larne, pack warm layers and a jacket for chilly mornings, with typical highs of 8.4°C and lows of 6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 87% — quite humid.
Average wind speed in December is 6.9 m/s. The windiest December on record averaged 8.7 m/s (2013).
The wettest December on record was 1999 with 208 mm. On average, December sees 117 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 Larne 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.
