December is one of the cooler months of the year in Southbourne, with average highs near 9.8°C and lows around 7.5°C (mean 8.7°C). It is a relatively wet time of year, averaging 102 mm of rainfall and 86% relative humidity across the period.
December is one of the cooler months of the year in Southbourne. Across 45 years of records, the warmest December in Southbourne was 2015 — when the month averaged 12.1°C — while the coldest was 2010 at 4.4°C. Typical December days reach 9.8°C with nights near 7.5°C. The long-term trend is warming, about 0.3°C per decade.
December is a relatively wet time of year in Southbourne, averaging 102 mm of rainfall. The wettest December on record was 2020 with 186 mm, while the driest was 2016 at 29 mm.
Relative humidity in Southbourne during December averages 86%. The most humid December was 2002 at 89%, and the least humid was 1990 at 83%.
December receives about 0.7 kWh/m²/day of solar energy in Southbourne. The sunniest Decembers were 2001, 2008 and 2016 at 0.8 kWh/m²/day, and the cloudiest were 1998 and 2002 at 0.5.
Average wind speed in Southbourne during December is 7.2 m/s. The windiest December was 2015 at 9 m/s, while the calmest was 2016 at 5.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.6°C | 8.2°C | 8.5°C | 9.1°C | 9.4°C | +0.8°C |
| Avg High | 9.7°C | 9.4°C | 9.6°C | 10.3°C | 10.5°C | +0.8°C |
| Avg Low | 7.4°C | 7.0°C | 7.3°C | 8.0°C | 8.3°C | +0.9°C |
| Avg Rain | 99 mm | 100 mm | 87 mm | 108 mm | 124 mm | +25 mm |
December temperatures in Southbourne have risen by about 1.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -0.7°C (1996) to a record high of 14.1°C (2024).
Rainfall in December is a relatively wet time of year, averaging 102 mm, with a wettest year of 186 mm.
A quieter season to visit Southbourne
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Southbourne. That said, December — with days averaging 9.8°C and nights around 7.5°C (mean 8.7°C) and higher rainfall (102 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 | 10.9°C | 9.9°C | 8.9°C | 13.8°C | 4.1°C | 140 mm | 86% | 7.7 m/s | — |
| 2024 | 10.9°C | 9.8°C | 8.7°C | 14.1°C | 6.6°C | 61 mm | 87% | 7.1 m/s | 0.6 |
| 2023 | 11.3°C | 10.2°C | 9.2°C | 13.1°C | 3.4°C | 140 mm | 88% | 8.1 m/s | 0.6 |
| 2022 | 9.3°C | 8.2°C | 7.1°C | 12.9°C | 2.2°C | 122 mm | 86% | 6.7 m/s | 0.7 |
| 2021 | 10.8°C | 9.8°C | 8.7°C | 12.8°C | 5.4°C | 95 mm | 88% | 6.8 m/s | 0.6 |
| 2020 🌧️ | 9.7°C | 8.6°C | 7.4°C | 12.8°C | 3.0°C | 186 mm | 87% | 7.3 m/s | 0.7 |
| 2019 | 10.4°C | 9.3°C | 8.1°C | 12.6°C | 4.6°C | 162 mm | 85% | 7.3 m/s | 0.7 |
| 2018 | 11.2°C | 10.3°C | 9.3°C | 13.5°C | 5.5°C | 151 mm | 86% | 7.1 m/s | 0.6 |
| 2017 | 10.1°C | 8.6°C | 7.2°C | 13.1°C | 4.2°C | 129 mm | 86% | 7.3 m/s | 0.7 |
| 2016 | 10.8°C | 10.0°C | 9.1°C | 12.7°C | 6.2°C | 29 mm | 87% | 5.1 m/s | 0.8 |
| 2015 🔥 | 12.9°C | 12.1°C | 11.3°C | 13.7°C | 9.0°C | 104 mm | 86% | 9 m/s | 0.6 |
| 2014 | 10.2°C | 8.9°C | 7.5°C | 12.7°C | 4.0°C | 55 mm | 83% | 7.5 m/s | 0.7 |
| 2013 | 10.8°C | 9.6°C | 8.3°C | 12.5°C | 6.5°C | 125 mm | 83% | 7.6 m/s | 0.7 |
| 2012 | 9.9°C | 8.7°C | 7.4°C | 12.3°C | 3.4°C | 167 mm | 85% | 7.7 m/s | 0.7 |
| 2011 | 11.0°C | 9.6°C | 8.3°C | 13.6°C | 4.8°C | 108 mm | 84% | 8.3 m/s | 0.7 |
| 2010 ❄️ | 5.5°C | 4.4°C | 3.3°C | 9.1°C | 0.8°C | 54 mm | 88% | 6.1 m/s | 0.6 |
| 2009 | 8.9°C | 7.6°C | 6.3°C | 13.2°C | 1.6°C | 103 mm | 85% | 6.8 m/s | 0.7 |
| 2008 | 8.4°C | 7.3°C | 6.2°C | 11.5°C | 3.1°C | 52 mm | 86% | 6.2 m/s | 0.8 |
| 2007 | 10.2°C | 9.1°C | 8.0°C | 13.9°C | 4.7°C | 62 mm | 83% | 7.7 m/s | 0.7 |
| 2006 | 11.0°C | 10.0°C | 8.9°C | 14.0°C | 5.1°C | 102 mm | 85% | 7.8 m/s | 0.6 |
| 2005 | 9.3°C | 8.0°C | 6.7°C | 11.9°C | 1.2°C | 79 mm | 85% | 6.3 m/s | 0.7 |
| 2004 | 10.0°C | 8.8°C | 7.6°C | 12.4°C | 3.8°C | 65 mm | 86% | 5.9 m/s | 0.6 |
| 2003 | 9.7°C | 8.5°C | 7.3°C | 12.5°C | 3.1°C | 103 mm | 85% | 6.8 m/s | 0.6 |
| 2002 | 9.9°C | 8.9°C | 8.0°C | 12.9°C | 2.9°C | 117 mm | 89% | 7 m/s | 0.5 |
| 2001 | 8.7°C | 7.4°C | 6.1°C | 13.7°C | 2.6°C | 40 mm | 83% | 6.9 m/s | 0.8 |
| 2000 | 9.9°C | 9.0°C | 8.1°C | 13.0°C | 3.3°C | 150 mm | 87% | 7.9 m/s | 0.6 |
| 1999 | 9.9°C | 8.6°C | 7.3°C | 12.7°C | 2.6°C | 182 mm | 85% | 8.6 m/s | 0.6 |
| 1998 | 10.1°C | 8.8°C | 7.5°C | 12.7°C | 2.8°C | 104 mm | 88% | 7 m/s | 0.5 |
| 1997 | 10.5°C | 9.4°C | 8.3°C | 13.8°C | 3.5°C | 104 mm | 86% | 7.4 m/s | 0.6 |
| 1996 | 7.3°C | 6.3°C | 5.2°C | 12.4°C | -0.7°C | 40 mm | 86% | 6.8 m/s | 0.6 |
| 1995 | 8.4°C | 7.1°C | 5.8°C | 13.7°C | 1.5°C | 109 mm | 88% | 6.5 m/s | 0.6 |
| 1994 | 11.4°C | 10.3°C | 9.2°C | 13.8°C | 4.6°C | 102 mm | 84% | 8 m/s | 0.7 |
| 1993 | 9.7°C | 8.3°C | 6.9°C | 12.3°C | 2.4°C | 154 mm | 86% | 8.8 m/s | 0.7 |
| 1992 | 8.8°C | 7.5°C | 6.3°C | 13.3°C | 3.4°C | 96 mm | 86% | 6.8 m/s | 0.6 |
| 1991 | 9.2°C | 8.2°C | 7.3°C | 12.3°C | 4.3°C | 34 mm | 83% | 6.3 m/s | 0.7 |
| 1990 | 8.6°C | 7.3°C | 6.0°C | 11.6°C | 2.5°C | 73 mm | 83% | 7.3 m/s | 0.6 |
| 1989 | 10.3°C | 9.2°C | 8.2°C | 13.4°C | 4.6°C | 152 mm | 86% | 7.6 m/s | 0.7 |
| 1988 | 10.5°C | 9.3°C | 8.2°C | 12.4°C | 3.7°C | 33 mm | 88% | 5.7 m/s | 0.6 |
| 1987 | 9.5°C | 8.7°C | 7.8°C | 12.6°C | 3.8°C | 56 mm | 89% | 7.5 m/s | 0.6 |
| 1986 | 10.1°C | 8.8°C | 7.4°C | 13.1°C | 2.9°C | 109 mm | 85% | 8.2 m/s | 0.7 |
| 1985 | 10.3°C | 9.4°C | 8.5°C | 13.4°C | 1.4°C | 131 mm | 87% | 6.9 m/s | 0.6 |
| 1984 | 10.1°C | 9.0°C | 7.8°C | 12.2°C | 4.8°C | 112 mm | 84% | 5.7 m/s | 0.7 |
| 1983 | 10.0°C | 8.9°C | 7.8°C | 12.3°C | 3.4°C | 82 mm | 83% | 7.2 m/s | — |
| 1982 | 9.1°C | 7.8°C | 6.5°C | 12.9°C | 2.9°C | 109 mm | 84% | 6.9 m/s | — |
| 1981 | 7.7°C | 6.1°C | 4.5°C | 10.9°C | 1.1°C | 109 mm | 85% | 6.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 9.8°C with lows near 7.5°C (mean 8.7°C), based on 45 years of NASA POWER data.
December averages 102 mm of rainfall in Southbourne, a relatively wet time of year. The wettest on record was 186 mm in 2020.
The hottest December reached 14.1°C in 2024. The coldest dipped to -0.7°C in 1996.
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 9.4°C to 10.6°C and overnight lows from 7°C to 8.5°C over the same span.
December is one of the cooler months of the year in Southbourne and a relatively wet time of year, so plan for around 9.8°C daytime highs and 7.5°C at night.
Not quite — December is the 4th coolest month in Southbourne, averaging 8.7°C.
For December in Southbourne, pack warm layers and a jacket for chilly mornings, with typical highs of 9.8°C and lows of 7.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 86% — quite humid.
Average wind speed in December is 7.2 m/s. The windiest December on record averaged 9 m/s (2015).
The wettest December on record was 2020 with 186 mm. On average, December sees 102 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 Southbourne 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.
