December is one of the cooler months of the year in Saint Austell, with average highs near 10°C and lows around 7.5°C (mean 8.8°C). It is a relatively wet time of year, averaging 129 mm of rainfall and 86% relative humidity across the period.
December is one of the cooler months of the year in Saint Austell. Across 45 years of records, the warmest December in Saint Austell was 2015 — when the month averaged 11.5°C — while the coldest was 2010 at 5°C. Typical December days reach 10°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 Saint Austell, averaging 129 mm of rainfall. The wettest December on record was 1999 with 267 mm, while the driest was 1991 at 38 mm.
Relative humidity in Saint Austell during December averages 86%. The most humid December was 1987 at 90%, and the least humid was 2014 at 82%.
December receives about 0.7 kWh/m²/day of solar energy in Saint Austell. 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 Saint Austell during December is 7.2 m/s. The windiest December was 2015 at 9.4 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 | 8.6°C | 9.2°C | 9.4°C | +0.8°C |
| Avg High | 9.9°C | 9.6°C | 9.8°C | 10.4°C | 10.5°C | +0.6°C |
| Avg Low | 7.3°C | 6.9°C | 7.3°C | 8.0°C | 8.3°C | +1°C |
| Avg Rain | 126 mm | 131 mm | 108 mm | 132 mm | 161 mm | +34 mm |
December temperatures in Saint Austell have risen by about 1.1°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -2°C (1996) to a record high of 15.3°C (1985).
Rainfall in December is a relatively wet time of year, averaging 129 mm, with a wettest year of 267 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A quieter season to visit Saint Austell
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Saint Austell. That said, December — with days averaging 10°C and nights around 7.5°C (mean 8.8°C) and higher rainfall (129 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 | 10.5°C | 9.4°C | 8.2°C | 14.2°C | 4.0°C | 195 mm | 87% | 7.4 m/s | — |
| 2024 | 10.8°C | 9.7°C | 8.5°C | 13.9°C | 6.2°C | 95 mm | 87% | 7 m/s | 0.6 |
| 2023 | 11.4°C | 10.4°C | 9.5°C | 13.1°C | 3.7°C | 177 mm | 87% | 8.1 m/s | 0.6 |
| 2022 | 9.0°C | 7.8°C | 6.7°C | 13.5°C | 2.8°C | 129 mm | 86% | 6.4 m/s | 0.7 |
| 2021 | 11.1°C | 10.0°C | 8.9°C | 13.1°C | 6.4°C | 123 mm | 89% | 7.4 m/s | 0.6 |
| 2020 | 9.9°C | 8.8°C | 7.7°C | 13.0°C | 4.2°C | 245 mm | 85% | 7.8 m/s | 0.7 |
| 2019 | 10.4°C | 9.2°C | 8.0°C | 12.8°C | 4.7°C | 160 mm | 85% | 7.5 m/s | 0.7 |
| 2018 | 11.4°C | 10.5°C | 9.5°C | 13.6°C | 6.3°C | 198 mm | 88% | 7 m/s | 0.5 |
| 2017 | 10.2°C | 9.0°C | 7.7°C | 13.0°C | 4.3°C | 158 mm | 85% | 7.3 m/s | 0.7 |
| 2016 | 11.1°C | 10.0°C | 8.9°C | 13.2°C | 5.9°C | 52 mm | 88% | 5.1 m/s | 0.6 |
| 2015 🔥 | 12.7°C | 11.5°C | 10.4°C | 13.7°C | 7.5°C | 170 mm | 88% | 9.4 m/s | 0.5 |
| 2014 | 10.2°C | 8.9°C | 7.7°C | 12.2°C | 3.5°C | 84 mm | 82% | 7.3 m/s | 0.7 |
| 2013 | 10.8°C | 9.4°C | 8.0°C | 12.9°C | 6.4°C | 104 mm | 83% | 7.5 m/s | 0.6 |
| 2012 | 10.0°C | 8.9°C | 7.8°C | 12.6°C | 4.0°C | 210 mm | 85% | 7.6 m/s | 0.6 |
| 2011 | 10.7°C | 9.6°C | 8.4°C | 12.8°C | 6.4°C | 145 mm | 83% | 8.5 m/s | 0.6 |
| 2010 ❄️ | 6.2°C | 5.0°C | 3.9°C | 10.8°C | 1.2°C | 46 mm | 84% | 5.6 m/s | 0.8 |
| 2009 | 8.9°C | 7.6°C | 6.3°C | 12.4°C | 2.2°C | 113 mm | 85% | 6.4 m/s | 0.7 |
| 2008 | 8.9°C | 7.8°C | 6.7°C | 11.7°C | 3.2°C | 85 mm | 86% | 6.5 m/s | 0.7 |
| 2007 | 10.6°C | 9.4°C | 8.1°C | 14.2°C | 4.0°C | 102 mm | 84% | 8.2 m/s | 0.7 |
| 2006 | 10.9°C | 9.7°C | 8.4°C | 13.7°C | 4.1°C | 109 mm | 84% | 7.9 m/s | 0.6 |
| 2005 | 9.5°C | 8.2°C | 7.0°C | 11.8°C | 1.5°C | 104 mm | 84% | 5.9 m/s | 0.7 |
| 2004 | 10.6°C | 9.3°C | 8.0°C | 12.8°C | 4.5°C | 79 mm | 86% | 6.1 m/s | 0.6 |
| 2003 | 10.0°C | 8.7°C | 7.4°C | 12.5°C | 4.3°C | 115 mm | 86% | 7 m/s | 0.6 |
| 2002 | 9.8°C | 8.8°C | 7.8°C | 12.6°C | 1.7°C | 144 mm | 89% | 7.2 m/s | 0.6 |
| 2001 | 9.1°C | 7.6°C | 6.0°C | 13.5°C | 2.3°C | 60 mm | 84% | 6.6 m/s | 0.8 |
| 2000 | 9.8°C | 8.7°C | 7.6°C | 13.1°C | 2.7°C | 167 mm | 87% | 8.2 m/s | 0.7 |
| 1999 🌧️ | 10.2°C | 8.9°C | 7.6°C | 12.7°C | 2.4°C | 267 mm | 84% | 8.8 m/s | 0.6 |
| 1998 | 10.4°C | 8.9°C | 7.4°C | 13.0°C | 1.9°C | 151 mm | 87% | 6.9 m/s | 0.6 |
| 1997 | 10.6°C | 9.3°C | 8.1°C | 13.9°C | 2.6°C | 131 mm | 86% | 7.4 m/s | 0.7 |
| 1996 | 7.5°C | 6.1°C | 4.7°C | 12.4°C | -2.0°C | 49 mm | 87% | 6.1 m/s | 0.6 |
| 1995 | 8.7°C | 7.1°C | 5.6°C | 13.4°C | 0.5°C | 104 mm | 89% | 6.3 m/s | 0.6 |
| 1994 | 11.1°C | 9.9°C | 8.6°C | 13.7°C | 3.7°C | 157 mm | 86% | 8 m/s | 0.7 |
| 1993 | 10.0°C | 8.6°C | 7.3°C | 12.4°C | 3.9°C | 211 mm | 84% | 9.1 m/s | 0.7 |
| 1992 | 8.9°C | 7.5°C | 6.1°C | 12.8°C | 2.6°C | 105 mm | 86% | 6.4 m/s | 0.7 |
| 1991 | 9.4°C | 8.2°C | 7.0°C | 12.0°C | 3.5°C | 38 mm | 86% | 6.2 m/s | 0.7 |
| 1990 | 8.7°C | 7.4°C | 6.1°C | 12.2°C | 3.2°C | 100 mm | 82% | 7.2 m/s | 0.7 |
| 1989 | 10.1°C | 8.7°C | 7.3°C | 13.0°C | 3.7°C | 166 mm | 88% | 7.6 m/s | 0.7 |
| 1988 | 10.9°C | 9.7°C | 8.4°C | 12.6°C | 4.5°C | 59 mm | 88% | 5.5 m/s | 0.6 |
| 1987 | 9.5°C | 8.5°C | 7.5°C | 12.9°C | 2.5°C | 90 mm | 90% | 7.9 m/s | 0.7 |
| 1986 | 10.3°C | 8.8°C | 7.4°C | 12.9°C | 4.4°C | 162 mm | 85% | 8.2 m/s | 0.7 |
| 1985 | 10.5°C | 9.3°C | 8.1°C | 15.3°C | 1.3°C | 131 mm | 87% | 6.7 m/s | 0.7 |
| 1984 | 10.1°C | 8.8°C | 7.4°C | 12.3°C | 4.4°C | 122 mm | 86% | 5.8 m/s | 0.7 |
| 1983 | 10.4°C | 9.1°C | 7.7°C | 12.8°C | 4.8°C | 111 mm | 86% | 7.2 m/s | — |
| 1982 | 9.3°C | 8.1°C | 6.8°C | 13.1°C | 3.5°C | 134 mm | 85% | 7.3 m/s | — |
| 1981 | 8.3°C | 6.8°C | 5.3°C | 11.3°C | 0.9°C | 162 mm | 84% | 6.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 10°C with lows near 7.5°C (mean 8.8°C), based on 45 years of NASA POWER data.
December averages 129 mm of rainfall in Saint Austell, a relatively wet time of year. The wettest on record was 267 mm in 1999.
The hottest December reached 15.3°C in 1985. The coldest dipped to -2°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.1°C. Daytime highs moved from 9.7°C to 10.6°C and overnight lows from 7.1°C to 8.4°C over the same span.
December is one of the cooler months of the year in Saint Austell and a relatively wet time of year, so plan for around 10°C daytime highs and 7.5°C at night.
Not quite — December is the 4th coolest month in Saint Austell, averaging 8.8°C.
For December in Saint Austell, pack warm layers and a jacket for chilly mornings, with typical highs of 10°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 9.4 m/s (2015).
The wettest December on record was 1999 with 267 mm. On average, December sees 129 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 Saint Austell 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.
