December is one of the cooler months of the year in Upminster, with average highs near 7.3°C and lows around 2.5°C (mean 4.9°C). It is a relatively wet time of year, averaging 71 mm of rainfall and 94% relative humidity across the period.
December is one of the cooler months of the year in Upminster. Across 45 years of records, the warmest December in Upminster was 2015 — when the month averaged 9.8°C — while the coldest was 2010 at -0.2°C. Typical December days reach 7.3°C with nights near 2.5°C. The long-term trend is warming, about 0.5°C per decade.
December is a relatively wet time of year in Upminster, averaging 71 mm of rainfall. The wettest December on record was 2002 with 126 mm, while the driest was 1988 at 19 mm.
Relative humidity in Upminster during December averages 94%. The most humid December was 2016 at 96%, and the least humid was 1996 at 91%.
December receives about 0.6 kWh/m²/day of solar energy in Upminster. The sunniest Decembers were 2016, 2019 and 2022, among others at 0.7 kWh/m²/day, and the cloudiest was 2002 at 0.4.
Average wind speed in Upminster during December is 3.7 m/s. The windiest December was 2015 at 5.2 m/s, while the calmest were 1995 and 2016 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 4.6°C | 4.2°C | 4.6°C | 5.4°C | 6.1°C | +1.5°C |
| Avg High | 7.1°C | 6.7°C | 7.0°C | 7.9°C | 8.4°C | +1.3°C |
| Avg Low | 2.2°C | 1.8°C | 2.2°C | 2.8°C | 3.8°C | +1.6°C |
| Avg Rain | 68 mm | 70 mm | 66 mm | 75 mm | 78 mm | +10 mm |
December temperatures in Upminster have risen by about 2.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -8.1°C (1981) to a record high of 13.9°C (2015).
Rainfall in December is a relatively wet time of year, averaging 71 mm, with a wettest year of 126 mm.
A quieter season to visit Upminster
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Upminster. That said, December — with days averaging 7.3°C and nights around 2.5°C (mean 4.9°C) and moderate rainfall (71 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 | 9.3°C | 6.9°C | 4.6°C | 13.4°C | -1.1°C | 72 mm | 93% | 4 m/s | — |
| 2024 | 8.7°C | 6.5°C | 4.4°C | 13.7°C | 0.8°C | 46 mm | 94% | 4 m/s | 0.6 |
| 2023 | 9.2°C | 7.0°C | 4.8°C | 13.2°C | -2.7°C | 93 mm | 94% | 4.7 m/s | 0.6 |
| 2022 | 6.8°C | 4.4°C | 1.9°C | 12.6°C | -4.7°C | 68 mm | 95% | 3.5 m/s | 0.7 |
| 2021 | 8.9°C | 6.5°C | 4.1°C | 13.9°C | -2.5°C | 75 mm | 94% | 3.6 m/s | 0.5 |
| 2020 | 7.3°C | 5.1°C | 2.9°C | 12.9°C | -2.2°C | 114 mm | 95% | 3.5 m/s | 0.6 |
| 2019 | 8.6°C | 6.1°C | 3.5°C | 12.4°C | -1.7°C | 104 mm | 95% | 3.9 m/s | 0.7 |
| 2018 | 9.0°C | 6.5°C | 4.0°C | 13.1°C | -2.8°C | 81 mm | 94% | 3.6 m/s | 0.6 |
| 2017 | 7.0°C | 4.4°C | 1.8°C | 11.8°C | -4.2°C | 99 mm | 95% | 3.9 m/s | 0.6 |
| 2016 | 8.6°C | 6.1°C | 3.5°C | 12.6°C | -1.2°C | 21 mm | 96% | 2.7 m/s | 0.7 |
| 2015 🔥 | 11.8°C | 9.8°C | 7.7°C | 13.9°C | 3.4°C | 69 mm | 92% | 5.2 m/s | 0.5 |
| 2014 | 7.8°C | 4.9°C | 2.0°C | 12.6°C | -2.8°C | 54 mm | 94% | 4.1 m/s | 0.7 |
| 2013 | 8.8°C | 5.9°C | 3.0°C | 12.0°C | -1.0°C | 81 mm | 95% | 4.1 m/s | 0.6 |
| 2012 | 7.1°C | 4.7°C | 2.3°C | 12.0°C | -4.4°C | 121 mm | 95% | 4.1 m/s | 0.6 |
| 2011 | 8.1°C | 5.4°C | 2.8°C | 11.8°C | -1.9°C | 87 mm | 93% | 4.4 m/s | 0.7 |
| 2010 ❄️ | 1.9°C | -0.2°C | -2.3°C | 5.5°C | -5.9°C | 36 mm | 96% | 2.8 m/s | 0.5 |
| 2009 | 5.5°C | 3.2°C | 0.9°C | 11.8°C | -5.7°C | 89 mm | 95% | 3.4 m/s | 0.7 |
| 2008 | 5.8°C | 3.5°C | 1.2°C | 11.5°C | -3.2°C | 34 mm | 96% | 3.1 m/s | 0.7 |
| 2007 | 7.7°C | 4.9°C | 2.0°C | 13.4°C | -3.2°C | 48 mm | 93% | 3.9 m/s | 0.7 |
| 2006 | 8.9°C | 6.7°C | 4.4°C | 12.7°C | -0.8°C | 75 mm | 93% | 4.2 m/s | 0.6 |
| 2005 | 6.6°C | 4.1°C | 1.7°C | 10.1°C | -3.5°C | 45 mm | 95% | 3.3 m/s | 0.7 |
| 2004 | 7.1°C | 4.7°C | 2.2°C | 11.6°C | -2.8°C | 48 mm | 95% | 2.9 m/s | 0.6 |
| 2003 | 7.3°C | 4.7°C | 2.1°C | 12.5°C | -2.7°C | 67 mm | 94% | 3.3 m/s | 0.6 |
| 2002 🌧️ | 7.6°C | 5.6°C | 3.6°C | 12.6°C | -2.1°C | 126 mm | 95% | 3.4 m/s | 0.4 |
| 2001 | 5.7°C | 2.7°C | -0.3°C | 13.0°C | -4.0°C | 30 mm | 95% | 3.2 m/s | 0.7 |
| 2000 | 7.3°C | 5.5°C | 3.8°C | 12.9°C | -2.8°C | 100 mm | 95% | 4.2 m/s | 0.6 |
| 1999 | 6.9°C | 4.4°C | 1.9°C | 12.0°C | -4.5°C | 93 mm | 94% | 4.5 m/s | 0.6 |
| 1998 | 7.7°C | 5.4°C | 3.0°C | 12.8°C | -3.7°C | 85 mm | 95% | 3.8 m/s | 0.5 |
| 1997 | 7.6°C | 5.6°C | 3.5°C | 13.4°C | -2.2°C | 85 mm | 94% | 3.9 m/s | 0.5 |
| 1996 | 4.8°C | 2.5°C | 0.2°C | 11.4°C | -4.5°C | 28 mm | 91% | 3.2 m/s | 0.5 |
| 1995 | 4.4°C | 2.1°C | -0.2°C | 11.3°C | -5.4°C | 92 mm | 94% | 2.7 m/s | 0.5 |
| 1994 | 8.7°C | 6.2°C | 3.6°C | 13.3°C | -3.4°C | 76 mm | 94% | 4.3 m/s | 0.7 |
| 1993 | 7.5°C | 4.9°C | 2.4°C | 13.1°C | -3.0°C | 108 mm | 93% | 4.9 m/s | 0.6 |
| 1992 | 6.1°C | 3.5°C | 0.9°C | 12.9°C | -3.2°C | 56 mm | 95% | 3.3 m/s | 0.6 |
| 1991 | 6.4°C | 3.9°C | 1.4°C | 12.8°C | -5.7°C | 23 mm | 93% | 3 m/s | 0.7 |
| 1990 | 6.5°C | 3.8°C | 1.2°C | 11.1°C | -2.6°C | 55 mm | 92% | 3.8 m/s | 0.5 |
| 1989 | 7.6°C | 5.2°C | 2.9°C | 12.9°C | -2.5°C | 112 mm | 94% | 3.5 m/s | 0.6 |
| 1988 | 8.6°C | 6.2°C | 3.8°C | 11.8°C | -1.5°C | 19 mm | 95% | 3.4 m/s | 0.6 |
| 1987 | 7.3°C | 5.1°C | 2.9°C | 12.7°C | -3.5°C | 32 mm | 95% | 3.5 m/s | 0.5 |
| 1986 | 7.9°C | 5.1°C | 2.4°C | 13.5°C | -2.2°C | 74 mm | 93% | 4.7 m/s | 0.6 |
| 1985 | 8.3°C | 6.2°C | 4.2°C | 12.7°C | -5.7°C | 90 mm | 94% | 4 m/s | 0.6 |
| 1984 | 7.4°C | 4.8°C | 2.3°C | 11.4°C | -1.9°C | 76 mm | 95% | 2.8 m/s | 0.7 |
| 1983 | 7.4°C | 4.9°C | 2.5°C | 11.8°C | -4.2°C | 69 mm | 94% | 3.9 m/s | — |
| 1982 | 6.5°C | 3.7°C | 0.9°C | 11.8°C | -4.2°C | 72 mm | 95% | 3.6 m/s | — |
| 1981 | 2.7°C | 0.3°C | -2.1°C | 9.1°C | -8.1°C | 69 mm | 95% | 3.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 7.3°C with lows near 2.5°C (mean 4.9°C), based on 45 years of NASA POWER data.
December averages 71 mm of rainfall in Upminster, a relatively wet time of year. The wettest on record was 126 mm in 2002.
The hottest December reached 13.9°C in 2015. The coldest dipped to -8.1°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.3°C. Daytime highs moved from 6.5°C to 8.6°C and overnight lows from 1.6°C to 4°C over the same span.
December is one of the cooler months of the year in Upminster and a relatively wet time of year, so plan for around 7.3°C daytime highs and 2.5°C at night.
Not quite — December is the 3rd coolest month in Upminster, averaging 4.9°C.
For December in Upminster, pack warm layers and a jacket for chilly mornings, with typical highs of 7.3°C and lows of 2.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 94% — quite humid.
Average wind speed in December is 3.7 m/s. The windiest December on record averaged 5.2 m/s (2015).
The wettest December on record was 2002 with 126 mm. On average, December sees 71 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 Upminster 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.
