December is one of the warmer months of the year in Cambridge, with average highs near 22.1°C and lows around 11.9°C (mean 17°C). It is about average for rainfall, averaging 94 mm of rainfall and 76% relative humidity across the period.
December is one of the warmer months of the year in Cambridge. Across 45 years of records, the warmest December in Cambridge was 2021 — when the month averaged 19.4°C — while the coldest was 2004 at 13.9°C. Typical December days reach 22.1°C with nights near 11.9°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Cambridge, averaging 94 mm of rainfall. The wettest December on record was 2011 with 211 mm, while the driest was 2015 at 24 mm.
Relative humidity in Cambridge during December averages 76%. The most humid December was 2005 at 81%, and the least humid was 2020 at 72%.
December receives about 6.2 kWh/m²/day of solar energy in Cambridge. The sunniest December was 2017 at 7.3 kWh/m²/day, and the cloudiest was 2011 at 5.
Average wind speed in Cambridge during December is 2.5 m/s. The windiest December was 2004 at 3.6 m/s, while the calmest were 1985 and 2017 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.9°C | 16.4°C | 16.5°C | 17.4°C | 18.2°C | +1.3°C |
| Avg High | 22.1°C | 21.6°C | 21.4°C | 22.6°C | 23.4°C | +1.3°C |
| Avg Low | 11.8°C | 11.2°C | 11.7°C | 12.2°C | 12.9°C | +1.1°C |
| Avg Rain | 103 mm | 82 mm | 97 mm | 96 mm | 97 mm | -6 mm |
December temperatures in Cambridge have risen by about 1.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 2.7°C (1992) to a record high of 30.2°C (1995).
Rainfall in December is about average for rainfall, averaging 94 mm, with a wettest year of 211 mm.
One of the best times to visit Cambridge
December is one of the best times to visit Cambridge. Expect days averaging 22.1°C and nights around 11.9°C (mean 17°C) — warmer than Cambridge's yearly average — with higher rainfall (94 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 | 23.1°C | 17.9°C | 12.7°C | 29.2°C | 8.5°C | 97 mm | 75% | 2.6 m/s | — |
| 2024 | 24.0°C | 18.4°C | 12.8°C | 28.3°C | 7.9°C | 71 mm | 76% | 2.5 m/s | 6.9 |
| 2023 | 23.0°C | 18.2°C | 13.4°C | 28.0°C | 8.8°C | 126 mm | 80% | 2.4 m/s | 5.7 |
| 2022 | 22.9°C | 18.1°C | 13.3°C | 26.8°C | 8.9°C | 141 mm | 79% | 2.1 m/s | 6.5 |
| 2021 🔥 | 24.3°C | 19.4°C | 14.5°C | 28.3°C | 10.9°C | 113 mm | 77% | 2.4 m/s | 6.2 |
| 2020 | 23.0°C | 16.9°C | 10.8°C | 26.8°C | 6.0°C | 32 mm | 72% | 2.6 m/s | 7 |
| 2019 | 23.6°C | 17.7°C | 11.9°C | 27.8°C | 6.2°C | 77 mm | 73% | 2.5 m/s | 6.9 |
| 2018 | 22.7°C | 17.8°C | 12.9°C | 28.0°C | 5.7°C | 194 mm | 78% | 2.2 m/s | 6.1 |
| 2017 | 23.9°C | 18.5°C | 13.1°C | 28.1°C | 7.9°C | 34 mm | 73% | 2 m/s | 7.3 |
| 2016 | 21.8°C | 16.2°C | 10.6°C | 25.7°C | 6.9°C | 47 mm | 75% | 2.5 m/s | 6.4 |
| 2015 | 22.2°C | 16.7°C | 11.2°C | 28.9°C | 7.9°C | 24 mm | 73% | 2.7 m/s | 6.8 |
| 2014 | 21.7°C | 16.7°C | 11.6°C | 26.0°C | 4.3°C | 93 mm | 76% | 2.5 m/s | 5.9 |
| 2013 | 22.3°C | 17.1°C | 11.9°C | 27.4°C | 8.3°C | 110 mm | 74% | 2.4 m/s | 6.4 |
| 2012 | 23.4°C | 18.2°C | 13.0°C | 27.7°C | 6.0°C | 71 mm | 77% | 2.4 m/s | 5.8 |
| 2011 🌧️ | 21.1°C | 16.8°C | 12.6°C | 24.8°C | 7.4°C | 211 mm | 79% | 2.5 m/s | 5 |
| 2010 | 23.4°C | 18.5°C | 13.5°C | 28.4°C | 9.6°C | 92 mm | 78% | 2.4 m/s | 5.4 |
| 2009 | 21.7°C | 16.2°C | 10.6°C | 27.0°C | 7.6°C | 75 mm | 75% | 2.7 m/s | 6.4 |
| 2008 | 22.2°C | 17.0°C | 11.9°C | 25.8°C | 7.5°C | 92 mm | 76% | 2.5 m/s | 6 |
| 2007 | 22.5°C | 17.5°C | 12.5°C | 27.2°C | 8.5°C | 75 mm | 75% | 2.4 m/s | 5.8 |
| 2006 | 19.6°C | 14.2°C | 8.8°C | 23.8°C | 3.3°C | 67 mm | 75% | 2.6 m/s | 6.4 |
| 2005 | 21.9°C | 17.4°C | 12.9°C | 25.3°C | 9.1°C | 141 mm | 81% | 2.7 m/s | 5.8 |
| 2004 ❄️ | 18.2°C | 13.9°C | 9.7°C | 23.8°C | 4.7°C | 120 mm | 78% | 3.6 m/s | 5.6 |
| 2003 | 22.6°C | 17.4°C | 12.1°C | 27.2°C | 7.3°C | 110 mm | 77% | 2.4 m/s | 5.8 |
| 2002 | 21.4°C | 16.5°C | 11.5°C | 25.1°C | 7.4°C | 92 mm | 75% | 2.6 m/s | 6.1 |
| 2001 | 21.7°C | 17.6°C | 13.6°C | 24.9°C | 10.3°C | 156 mm | 80% | 2.7 m/s | 5.1 |
| 2000 | 22.3°C | 17.6°C | 12.9°C | 26.3°C | 9.7°C | 43 mm | 76% | 2.5 m/s | 5.9 |
| 1999 | 21.3°C | 16.2°C | 11.0°C | 25.4°C | 5.6°C | 40 mm | 73% | 2.5 m/s | 6.2 |
| 1998 | 22.9°C | 17.6°C | 12.4°C | 28.1°C | 8.3°C | 74 mm | 73% | 2.6 m/s | 6.2 |
| 1997 | 22.2°C | 16.6°C | 11.0°C | 26.8°C | 6.8°C | 49 mm | 74% | 2.3 m/s | 6.3 |
| 1996 | 20.5°C | 15.4°C | 10.4°C | 24.9°C | 5.6°C | 185 mm | 77% | 2.7 m/s | 5.9 |
| 1995 | 22.8°C | 17.9°C | 12.9°C | 30.2°C | 9.5°C | 116 mm | 78% | 2.7 m/s | 6.1 |
| 1994 | 22.6°C | 17.2°C | 11.7°C | 27.3°C | 6.9°C | 40 mm | 73% | 2.5 m/s | 6.6 |
| 1993 | 20.6°C | 15.5°C | 10.3°C | 26.5°C | 6.6°C | 63 mm | 75% | 2.6 m/s | 5.9 |
| 1992 | 20.5°C | 15.6°C | 10.8°C | 23.4°C | 2.7°C | 144 mm | 79% | 2.5 m/s | 5.7 |
| 1991 | 20.7°C | 15.5°C | 10.3°C | 24.9°C | 4.8°C | 74 mm | 77% | 2.5 m/s | 6.4 |
| 1990 | 21.9°C | 16.6°C | 11.4°C | 27.5°C | 8.0°C | 31 mm | 75% | 3.1 m/s | 6.4 |
| 1989 | 21.2°C | 15.9°C | 10.7°C | 25.7°C | 5.1°C | 94 mm | 75% | 2.8 m/s | 6.5 |
| 1988 | 23.0°C | 18.0°C | 13.0°C | 26.7°C | 9.1°C | 127 mm | 75% | 2.4 m/s | 6.1 |
| 1987 | 21.5°C | 16.7°C | 11.9°C | 28.0°C | 7.6°C | 140 mm | 77% | 2.8 m/s | 6.1 |
| 1986 | 21.9°C | 16.3°C | 10.7°C | 26.1°C | 5.2°C | 74 mm | 73% | 2.1 m/s | 6.5 |
| 1985 | 22.3°C | 17.5°C | 12.6°C | 25.9°C | 9.4°C | 110 mm | 76% | 2 m/s | 6.4 |
| 1984 | 24.0°C | 18.7°C | 13.4°C | 28.6°C | 9.2°C | 141 mm | 76% | 2.2 m/s | 6.2 |
| 1983 | 20.7°C | 15.6°C | 10.5°C | 25.4°C | 5.9°C | 95 mm | 75% | 3 m/s | — |
| 1982 | 21.0°C | 15.6°C | 10.2°C | 26.0°C | 5.1°C | 55 mm | 73% | 3 m/s | — |
| 1981 | 23.3°C | 18.2°C | 13.2°C | 29.0°C | 8.4°C | 91 mm | 77% | 2.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 22.1°C with lows near 11.9°C (mean 17°C), based on 45 years of NASA POWER data.
December averages 94 mm of rainfall in Cambridge, about average for rainfall. The wettest on record was 211 mm in 2011.
The hottest December reached 30.2°C in 1995. The coldest dipped to 2.7°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.3°C. Daytime highs moved from 22.3°C to 23.5°C and overnight lows from 12°C to 13.3°C over the same span.
December is one of the warmer months of the year in Cambridge and about average for rainfall, so plan for around 22.1°C daytime highs and 11.9°C at night.
Not quite — December is the 9th coolest month in Cambridge, averaging 17°C.
For December in Cambridge, pack light layers you can adjust through the day, with typical highs of 22.1°C and lows of 11.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 76% — quite humid.
Average wind speed in December is 2.5 m/s. The windiest December on record averaged 3.6 m/s (2004).
The wettest December on record was 2011 with 211 mm. On average, December sees 94 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 Cambridge 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.
