December is one of the cooler months of the year in Falmouth, with average highs near 10.6°C and lows around 8.5°C (mean 9.6°C). It is a relatively wet time of year, averaging 122 mm of rainfall and 84% relative humidity across the period.
December is one of the cooler months of the year in Falmouth. Across 45 years of records, the warmest December in Falmouth was 2015 — when the month averaged 12.1°C — while the coldest was 2010 at 6.1°C. Typical December days reach 10.6°C with nights near 8.5°C. The long-term trend is warming, about 0.3°C per decade.
December is a relatively wet time of year in Falmouth, averaging 122 mm of rainfall. The wettest December on record was 1999 with 240 mm, while the driest was 1991 at 38 mm.
Relative humidity in Falmouth during December averages 84%. The most humid December was 1987 at 89%, and the least humid was 1990 at 80%.
December receives about 0.7 kWh/m²/day of solar energy in Falmouth. The sunniest Decembers were 2001 and 2010 at 0.8 kWh/m²/day, and the cloudiest were 2015 and 2018 at 0.5.
Average wind speed in Falmouth during December is 7.5 m/s. The windiest Decembers were 1993 and 2015 at 9.4 m/s, while the calmest was 2016 at 5.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.4°C | 9.1°C | 9.4°C | 9.9°C | 10.2°C | +0.8°C |
| Avg High | 10.5°C | 10.2°C | 10.4°C | 10.9°C | 11.1°C | +0.6°C |
| Avg Low | 8.3°C | 8.0°C | 8.4°C | 8.9°C | 9.2°C | +0.9°C |
| Avg Rain | 125 mm | 126 mm | 103 mm | 125 mm | 142 mm | +18 mm |
December temperatures in Falmouth have risen by about 1.2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -0.4°C (1996) to a record high of 15.2°C (1985).
Rainfall in December is a relatively wet time of year, averaging 122 mm, with a wettest year of 240 mm.
A quieter season to visit Falmouth
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Falmouth. That said, December — with days averaging 10.6°C and nights around 8.5°C (mean 9.6°C) and higher rainfall (122 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 | 11.4°C | 10.4°C | 9.4°C | 14.4°C | 5.6°C | 179 mm | 84% | 7.8 m/s | — |
| 2024 | 11.4°C | 10.4°C | 9.4°C | 14.0°C | 7.7°C | 90 mm | 86% | 7.3 m/s | 0.6 |
| 2023 | 11.9°C | 11.1°C | 10.2°C | 13.5°C | 5.2°C | 143 mm | 86% | 8.4 m/s | 0.6 |
| 2022 | 9.9°C | 8.9°C | 7.9°C | 13.8°C | 3.8°C | 145 mm | 84% | 7 m/s | 0.7 |
| 2021 | 11.5°C | 10.7°C | 9.9°C | 13.3°C | 7.9°C | 100 mm | 88% | 7.8 m/s | 0.6 |
| 2020 | 10.5°C | 9.5°C | 8.5°C | 13.1°C | 5.1°C | 197 mm | 84% | 8.3 m/s | 0.7 |
| 2019 | 10.9°C | 9.9°C | 8.9°C | 13.0°C | 5.8°C | 142 mm | 83% | 7.8 m/s | 0.7 |
| 2018 | 11.7°C | 10.9°C | 10.0°C | 13.5°C | 7.4°C | 186 mm | 88% | 7.1 m/s | 0.5 |
| 2017 | 10.8°C | 9.7°C | 8.6°C | 13.2°C | 5.0°C | 144 mm | 83% | 7.6 m/s | 0.7 |
| 2016 | 11.6°C | 10.7°C | 9.9°C | 13.3°C | 7.8°C | 51 mm | 86% | 5.2 m/s | 0.6 |
| 2015 🔥 | 13.0°C | 12.1°C | 11.1°C | 14.1°C | 8.3°C | 147 mm | 87% | 9.4 m/s | 0.5 |
| 2014 | 10.7°C | 9.7°C | 8.7°C | 12.6°C | 5.3°C | 72 mm | 81% | 7.5 m/s | 0.7 |
| 2013 | 11.3°C | 10.0°C | 8.8°C | 12.9°C | 6.4°C | 116 mm | 82% | 7.6 m/s | 0.6 |
| 2012 | 10.6°C | 9.7°C | 8.7°C | 12.7°C | 5.5°C | 202 mm | 83% | 8 m/s | 0.6 |
| 2011 | 11.3°C | 10.2°C | 9.2°C | 13.0°C | 7.3°C | 132 mm | 82% | 8.8 m/s | 0.6 |
| 2010 ❄️ | 7.1°C | 6.1°C | 5.2°C | 11.0°C | 2.2°C | 54 mm | 82% | 6.1 m/s | 0.8 |
| 2009 | 9.5°C | 8.4°C | 7.3°C | 12.6°C | 3.0°C | 118 mm | 83% | 6.8 m/s | 0.7 |
| 2008 | 9.6°C | 8.7°C | 7.8°C | 12.0°C | 5.9°C | 80 mm | 83% | 6.9 m/s | 0.7 |
| 2007 | 11.2°C | 10.2°C | 9.2°C | 14.4°C | 5.3°C | 95 mm | 82% | 8.4 m/s | 0.7 |
| 2006 | 11.5°C | 10.5°C | 9.5°C | 14.0°C | 6.4°C | 106 mm | 83% | 8.2 m/s | 0.6 |
| 2005 | 10.0°C | 9.0°C | 8.0°C | 12.1°C | 3.3°C | 103 mm | 82% | 6.2 m/s | 0.7 |
| 2004 | 10.9°C | 9.8°C | 8.7°C | 13.2°C | 5.7°C | 70 mm | 84% | 6.2 m/s | 0.6 |
| 2003 | 10.4°C | 9.3°C | 8.2°C | 12.7°C | 5.4°C | 101 mm | 85% | 7.2 m/s | 0.6 |
| 2002 | 10.5°C | 9.7°C | 8.9°C | 13.1°C | 3.9°C | 137 mm | 87% | 7.6 m/s | 0.6 |
| 2001 | 9.9°C | 8.7°C | 7.4°C | 13.6°C | 4.0°C | 57 mm | 81% | 7 m/s | 0.8 |
| 2000 | 10.4°C | 9.5°C | 8.5°C | 13.5°C | 3.9°C | 158 mm | 86% | 8.5 m/s | 0.7 |
| 1999 🌧️ | 10.9°C | 9.7°C | 8.5°C | 13.2°C | 4.0°C | 240 mm | 83% | 9.2 m/s | 0.6 |
| 1998 | 10.8°C | 9.6°C | 8.3°C | 13.3°C | 3.5°C | 155 mm | 87% | 7.2 m/s | 0.6 |
| 1997 | 11.1°C | 10.1°C | 9.0°C | 14.1°C | 4.6°C | 132 mm | 84% | 7.7 m/s | 0.7 |
| 1996 | 8.5°C | 7.5°C | 6.5°C | 12.5°C | -0.4°C | 61 mm | 85% | 6.6 m/s | 0.6 |
| 1995 | 9.8°C | 8.5°C | 7.3°C | 13.4°C | 2.0°C | 102 mm | 86% | 6.7 m/s | 0.6 |
| 1994 | 11.5°C | 10.6°C | 9.6°C | 13.9°C | 6.2°C | 148 mm | 85% | 8.1 m/s | 0.7 |
| 1993 | 10.5°C | 9.3°C | 8.0°C | 12.7°C | 5.1°C | 188 mm | 83% | 9.4 m/s | 0.7 |
| 1992 | 9.7°C | 8.5°C | 7.4°C | 13.0°C | 5.2°C | 107 mm | 84% | 6.8 m/s | 0.7 |
| 1991 | 10.0°C | 9.0°C | 8.1°C | 12.2°C | 5.4°C | 38 mm | 83% | 6.6 m/s | 0.7 |
| 1990 | 9.3°C | 8.2°C | 7.1°C | 12.4°C | 4.5°C | 88 mm | 80% | 7.5 m/s | 0.7 |
| 1989 | 11.0°C | 10.0°C | 9.0°C | 13.4°C | 6.6°C | 161 mm | 85% | 8.2 m/s | 0.7 |
| 1988 | 11.2°C | 10.2°C | 9.2°C | 13.4°C | 7.1°C | 55 mm | 87% | 5.5 m/s | 0.6 |
| 1987 | 10.3°C | 9.5°C | 8.7°C | 13.2°C | 4.9°C | 100 mm | 89% | 8.1 m/s | 0.7 |
| 1986 | 10.7°C | 9.5°C | 8.3°C | 13.0°C | 5.2°C | 158 mm | 84% | 8.4 m/s | 0.7 |
| 1985 | 10.9°C | 9.9°C | 9.0°C | 15.2°C | 3.0°C | 125 mm | 86% | 7 m/s | 0.7 |
| 1984 | 10.6°C | 9.4°C | 8.3°C | 12.3°C | 5.5°C | 113 mm | 85% | 5.9 m/s | 0.7 |
| 1983 | 10.8°C | 9.6°C | 8.5°C | 13.0°C | 5.8°C | 105 mm | 84% | 7.2 m/s | — |
| 1982 | 9.9°C | 8.7°C | 7.5°C | 13.2°C | 5.3°C | 139 mm | 84% | 7.5 m/s | — |
| 1981 | 9.2°C | 7.8°C | 6.4°C | 11.6°C | 2.2°C | 167 mm | 83% | 7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 10.6°C with lows near 8.5°C (mean 9.6°C), based on 45 years of NASA POWER data.
December averages 122 mm of rainfall in Falmouth, a relatively wet time of year. The wettest on record was 240 mm in 1999.
The hottest December reached 15.2°C in 1985. The coldest dipped to -0.4°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.2°C. Daytime highs moved from 10.3°C to 11.2°C and overnight lows from 7.9°C to 9.4°C over the same span.
December is one of the cooler months of the year in Falmouth and a relatively wet time of year, so plan for around 10.6°C daytime highs and 8.5°C at night.
Not quite — December is the 4th coolest month in Falmouth, averaging 9.6°C.
For December in Falmouth, pack light layers you can adjust through the day, with typical highs of 10.6°C and lows of 8.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 84% — quite humid.
Average wind speed in December is 7.5 m/s. The windiest December on record averaged 9.4 m/s (1993).
The wettest December on record was 1999 with 240 mm. On average, December sees 122 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 Falmouth 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.
