December is one of the warmer months of the year in Ashton, with average highs near 19.3°C and lows around 11.6°C (mean 15.5°C). It is about average for rainfall, averaging 73 mm of rainfall and 71% relative humidity across the period.
December is one of the warmer months of the year in Ashton. Across 45 years of records, the warmest December in Ashton was 2017 — when the month averaged 18°C — while the coldest was 2004 at 12.7°C. Typical December days reach 19.3°C with nights near 11.6°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Ashton, averaging 73 mm of rainfall. The wettest December on record was 2004 with 140 mm, while the driest was 2003 at 21 mm.
Relative humidity in Ashton during December averages 71%. The most humid December was 1992 at 78%, and the least humid was 1997 at 63%.
December receives about 6.2 kWh/m²/day of solar energy in Ashton. The sunniest December was 2003 at 6.9 kWh/m²/day, and the cloudiest were 1993, 2018 and 2021 at 5.5.
Average wind speed in Ashton during December is 3.5 m/s. The windiest Decembers were 2004 and 2019 at 4.3 m/s, while the calmest were 1982 and 1985 at 3.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.4°C | 14.8°C | 15.2°C | 16.0°C | 16.1°C | +0.7°C |
| Avg High | 19.1°C | 18.8°C | 19.1°C | 20.0°C | 19.9°C | +0.8°C |
| Avg Low | 11.7°C | 10.9°C | 11.4°C | 12.0°C | 12.3°C | +0.6°C |
| Avg Rain | 92 mm | 74 mm | 71 mm | 56 mm | 71 mm | -21 mm |
December temperatures in Ashton have risen by about 0.9°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 5.6°C (2014) to a record high of 29.3°C (2015).
Rainfall in December is about average for rainfall, averaging 73 mm, with a wettest year of 140 mm.
One of the best times to visit Ashton
December is one of the best times to visit Ashton. Expect days averaging 19.3°C and nights around 11.6°C (mean 15.5°C) — warmer than Ashton's yearly average — with moderate rainfall (73 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.4°C | 15.6°C | 11.8°C | 25.5°C | 9.0°C | 46 mm | 68% | 3.6 m/s | — |
| 2024 | 20.8°C | 16.9°C | 13.0°C | 27.1°C | 8.5°C | 81 mm | 72% | 3.6 m/s | 6.1 |
| 2023 | 20.8°C | 16.5°C | 12.2°C | 26.7°C | 8.5°C | 58 mm | 71% | 3.7 m/s | 5.8 |
| 2022 | 19.5°C | 16.0°C | 12.5°C | 28.6°C | 8.7°C | 56 mm | 76% | 3.2 m/s | 6 |
| 2021 | 19.4°C | 15.9°C | 12.4°C | 24.8°C | 10.4°C | 122 mm | 76% | 3.6 m/s | 5.5 |
| 2020 | 19.7°C | 15.8°C | 11.8°C | 28.6°C | 8.8°C | 66 mm | 68% | 3.6 m/s | 6.5 |
| 2019 | 19.8°C | 15.7°C | 11.6°C | 23.8°C | 8.6°C | 46 mm | 66% | 4.3 m/s | 6.6 |
| 2018 | 19.5°C | 16.0°C | 12.5°C | 27.4°C | 9.9°C | 61 mm | 77% | 3.3 m/s | 5.5 |
| 2017 🔥 | 22.2°C | 18.0°C | 13.8°C | 27.7°C | 10.0°C | 44 mm | 68% | 3.4 m/s | 6.5 |
| 2016 | 19.2°C | 15.2°C | 11.2°C | 25.8°C | 8.5°C | 66 mm | 70% | 3.6 m/s | 6.1 |
| 2015 | 20.1°C | 15.4°C | 10.7°C | 29.3°C | 7.1°C | 37 mm | 68% | 3.4 m/s | 6.5 |
| 2014 | 19.6°C | 15.6°C | 11.5°C | 26.4°C | 5.6°C | 42 mm | 73% | 3.7 m/s | 6.2 |
| 2013 | 20.0°C | 16.1°C | 12.1°C | 26.2°C | 8.6°C | 76 mm | 73% | 3.2 m/s | 5.9 |
| 2012 | 20.6°C | 16.2°C | 11.8°C | 28.1°C | 7.5°C | 40 mm | 71% | 3.4 m/s | 6.1 |
| 2011 | 18.4°C | 15.1°C | 11.9°C | 26.1°C | 8.9°C | 70 mm | 76% | 3.3 m/s | 6.3 |
| 2010 | 20.9°C | 16.8°C | 12.7°C | 29.2°C | 7.8°C | 80 mm | 68% | 3.8 m/s | 5.7 |
| 2009 | 18.8°C | 14.6°C | 10.5°C | 27.2°C | 6.8°C | 70 mm | 71% | 3.5 m/s | 6.2 |
| 2008 | 19.1°C | 15.3°C | 11.5°C | 26.0°C | 8.6°C | 87 mm | 72% | 3.5 m/s | 6.1 |
| 2007 | 20.0°C | 15.8°C | 11.6°C | 27.4°C | 9.4°C | 72 mm | 71% | 3.6 m/s | 6.1 |
| 2006 | 16.6°C | 13.1°C | 9.6°C | 23.2°C | 6.2°C | 109 mm | 73% | 3.7 m/s | 6.2 |
| 2005 | 20.1°C | 16.7°C | 13.3°C | 25.3°C | 10.3°C | 74 mm | 75% | 3.2 m/s | 5.6 |
| 2004 ❄️ 🌧️ | 16.0°C | 12.7°C | 9.4°C | 22.0°C | 6.7°C | 140 mm | 72% | 4.3 m/s | 6.2 |
| 2003 | 20.2°C | 15.9°C | 11.7°C | 26.4°C | 9.9°C | 21 mm | 66% | 3.4 m/s | 6.9 |
| 2002 | 19.5°C | 15.5°C | 11.4°C | 25.0°C | 7.7°C | 43 mm | 68% | 3.7 m/s | 6.3 |
| 2001 | 19.7°C | 16.2°C | 12.6°C | 26.3°C | 7.6°C | 50 mm | 73% | 3.4 m/s | 5.8 |
| 2000 | 20.6°C | 16.4°C | 12.2°C | 25.8°C | 9.0°C | 42 mm | 68% | 3.5 m/s | 6.5 |
| 1999 | 18.5°C | 14.6°C | 10.6°C | 28.1°C | 8.1°C | 43 mm | 69% | 3.5 m/s | 6.1 |
| 1998 | 20.3°C | 16.1°C | 11.8°C | 27.3°C | 9.0°C | 47 mm | 69% | 3.4 m/s | 5.9 |
| 1997 | 19.1°C | 14.8°C | 10.4°C | 25.8°C | 6.8°C | 64 mm | 63% | 3.8 m/s | 6.2 |
| 1996 | 19.3°C | 14.9°C | 10.6°C | 25.8°C | 8.0°C | 46 mm | 67% | 3.4 m/s | 6.6 |
| 1995 | 20.0°C | 15.8°C | 11.6°C | 25.2°C | 6.5°C | 80 mm | 74% | 3.8 m/s | 6 |
| 1994 | 19.8°C | 15.4°C | 11.1°C | 26.4°C | 8.6°C | 44 mm | 68% | 3.2 m/s | 6.6 |
| 1993 | 17.0°C | 13.7°C | 10.3°C | 23.1°C | 7.6°C | 110 mm | 77% | 3.2 m/s | 5.5 |
| 1992 | 16.7°C | 13.4°C | 10.1°C | 21.6°C | 7.0°C | 84 mm | 78% | 4.2 m/s | 5.8 |
| 1991 | 17.6°C | 14.2°C | 10.9°C | 24.7°C | 6.7°C | 112 mm | 75% | 3.2 m/s | 6.1 |
| 1990 | 19.6°C | 15.5°C | 11.4°C | 24.2°C | 7.9°C | 106 mm | 69% | 3.9 m/s | 6.6 |
| 1989 | 18.7°C | 15.1°C | 11.5°C | 23.2°C | 8.5°C | 114 mm | 70% | 3.4 m/s | 6.5 |
| 1988 | 21.7°C | 17.2°C | 12.7°C | 26.8°C | 8.5°C | 44 mm | 67% | 3.5 m/s | 6.8 |
| 1987 | 18.3°C | 14.8°C | 11.4°C | 24.4°C | 8.5°C | 79 mm | 73% | 3.4 m/s | 5.9 |
| 1986 | 18.5°C | 15.0°C | 11.5°C | 23.3°C | 7.4°C | 90 mm | 76% | 3.3 m/s | 6.8 |
| 1985 | 18.9°C | 15.4°C | 11.9°C | 24.4°C | 7.6°C | 100 mm | 76% | 3.1 m/s | 5.9 |
| 1984 | 19.2°C | 15.8°C | 12.3°C | 22.9°C | 9.9°C | 105 mm | 74% | 3.5 m/s | 5.9 |
| 1983 | 17.8°C | 14.2°C | 10.6°C | 24.3°C | 8.4°C | 121 mm | 74% | 3.6 m/s | — |
| 1982 | 18.5°C | 14.5°C | 10.4°C | 26.7°C | 6.8°C | 91 mm | 66% | 3.1 m/s | — |
| 1981 | 20.1°C | 16.6°C | 13.0°C | 25.9°C | 9.4°C | 83 mm | 75% | 3.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 19.3°C with lows near 11.6°C (mean 15.5°C), based on 45 years of NASA POWER data.
December averages 73 mm of rainfall in Ashton, about average for rainfall. The wettest on record was 140 mm in 2004.
The hottest December reached 29.3°C in 2015. The coldest dipped to 5.6°C in 2014.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.9°C. Daytime highs moved from 18.9°C to 20°C and overnight lows from 11.6°C to 12.4°C over the same span.
December is one of the warmer months of the year in Ashton and about average for rainfall, so plan for around 19.3°C daytime highs and 11.6°C at night.
Not quite — December is the 10th coolest month in Ashton, averaging 15.5°C.
For December in Ashton, pack light layers you can adjust through the day, with typical highs of 19.3°C and lows of 11.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 71% — moderately humid.
Average wind speed in December is 3.5 m/s. The windiest December on record averaged 4.3 m/s (2004).
The wettest December on record was 2004 with 140 mm. On average, December sees 73 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 Ashton 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.
