December is one of the cooler months of the year in King's Lynn, with average highs near 7.1°C and lows around 4°C (mean 5.6°C). It is about average for rainfall, averaging 68 mm of rainfall and 92% relative humidity across the period.
December is one of the cooler months of the year in King's Lynn. Across 45 years of records, the warmest December in King's Lynn was 2015 — when the month averaged 9.1°C — while the coldest was 2010 at 1.8°C. Typical December days reach 7.1°C with nights near 4°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in King's Lynn, averaging 68 mm of rainfall. The wettest December on record was 2017 with 118 mm, while the driest was 2016 at 27 mm.
Relative humidity in King's Lynn during December averages 92%. The most humid December was 2016 at 95%, and the least humid was 1995 at 86%.
December receives about 0.6 kWh/m²/day of solar energy in King's Lynn. The sunniest Decembers were 2013, 2014 and 2016, among others at 0.7 kWh/m²/day, and the cloudiest were 1997 and 2002 at 0.4.
Average wind speed in King's Lynn during December is 5.3 m/s. The windiest December was 1986 at 6.7 m/s, while the calmest were 2010 and 2016 at 4.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.3°C | 5.0°C | 5.5°C | 5.7°C | 6.4°C | +1.1°C |
| Avg High | 6.9°C | 6.7°C | 7.0°C | 7.4°C | 7.9°C | +1°C |
| Avg Low | 3.8°C | 3.4°C | 4.0°C | 4.1°C | 4.9°C | +1.1°C |
| Avg Rain | 59 mm | 68 mm | 59 mm | 72 mm | 89 mm | +29 mm |
December temperatures in King's Lynn have risen by about 1.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -3.7°C (1981) to a record high of 12.8°C (1986).
Rainfall in December is about average for rainfall, averaging 68 mm, with a wettest year of 118 mm.
A quieter season to visit King's Lynn
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting King's Lynn. That said, December — with days averaging 7.1°C and nights around 4°C (mean 5.6°C) and moderate rainfall (68 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 | 8.7°C | 7.2°C | 5.8°C | 12.4°C | 1.0°C | 86 mm | 91% | 5.6 m/s | — |
| 2024 | 8.3°C | 6.9°C | 5.5°C | 12.1°C | 3.2°C | 77 mm | 92% | 5.6 m/s | 0.6 |
| 2023 | 8.6°C | 7.0°C | 5.5°C | 12.5°C | -0.6°C | 105 mm | 91% | 6.2 m/s | 0.5 |
| 2022 | 6.7°C | 5.2°C | 3.7°C | 10.6°C | -0.5°C | 61 mm | 92% | 4.8 m/s | 0.6 |
| 2021 | 7.7°C | 6.1°C | 4.6°C | 12.3°C | 0.7°C | 87 mm | 93% | 4.8 m/s | 0.5 |
| 2020 | 7.3°C | 5.8°C | 4.4°C | 11.2°C | -0.3°C | 115 mm | 93% | 4.9 m/s | 0.6 |
| 2019 | 7.6°C | 6.0°C | 4.4°C | 11.3°C | 1.9°C | 89 mm | 94% | 5.4 m/s | 0.6 |
| 2018 | 8.1°C | 6.6°C | 5.1°C | 12.3°C | 1.3°C | 91 mm | 93% | 4.8 m/s | 0.6 |
| 2017 🌧️ | 6.6°C | 4.9°C | 3.3°C | 10.6°C | -0.5°C | 118 mm | 93% | 5.4 m/s | 0.6 |
| 2016 | 7.9°C | 6.3°C | 4.7°C | 11.8°C | 1.1°C | 27 mm | 95% | 4.3 m/s | 0.7 |
| 2015 🔥 | 10.9°C | 9.1°C | 7.4°C | 12.8°C | 3.7°C | 79 mm | 91% | 6.6 m/s | 0.5 |
| 2014 | 7.5°C | 5.7°C | 3.9°C | 11.4°C | 0.2°C | 57 mm | 91% | 5.9 m/s | 0.7 |
| 2013 | 8.0°C | 6.0°C | 4.1°C | 11.9°C | 2.0°C | 44 mm | 92% | 6.1 m/s | 0.7 |
| 2012 | 6.6°C | 5.0°C | 3.4°C | 10.5°C | -0.3°C | 110 mm | 93% | 5.6 m/s | 0.6 |
| 2011 | 7.4°C | 5.8°C | 4.1°C | 11.1°C | -0.6°C | 74 mm | 91% | 6.6 m/s | 0.7 |
| 2010 ❄️ | 3.0°C | 1.8°C | 0.5°C | 6.5°C | -2.8°C | 34 mm | 88% | 4.3 m/s | 0.6 |
| 2009 | 6.0°C | 4.6°C | 3.3°C | 11.0°C | -0.5°C | 83 mm | 91% | 5.1 m/s | 0.6 |
| 2008 | 6.0°C | 4.5°C | 3.1°C | 10.0°C | -0.1°C | 43 mm | 93% | 4.6 m/s | 0.6 |
| 2007 | 7.4°C | 5.6°C | 3.9°C | 12.3°C | 1.1°C | 50 mm | 93% | 5.3 m/s | 0.6 |
| 2006 | 8.7°C | 7.1°C | 5.4°C | 12.4°C | 1.8°C | 53 mm | 92% | 5.5 m/s | 0.5 |
| 2005 | 6.6°C | 5.2°C | 3.8°C | 9.8°C | -0.4°C | 36 mm | 92% | 5 m/s | 0.6 |
| 2004 | 7.3°C | 5.7°C | 4.0°C | 10.7°C | 0.3°C | 38 mm | 93% | 4.7 m/s | 0.6 |
| 2003 | 7.3°C | 5.8°C | 4.3°C | 11.0°C | 1.2°C | 65 mm | 91% | 4.9 m/s | 0.6 |
| 2002 | 7.2°C | 6.0°C | 4.8°C | 10.8°C | 1.4°C | 104 mm | 90% | 5.1 m/s | 0.4 |
| 2001 | 6.7°C | 4.9°C | 3.0°C | 11.5°C | -0.2°C | 44 mm | 90% | 4.9 m/s | 0.6 |
| 2000 | 7.0°C | 5.8°C | 4.5°C | 11.9°C | -0.9°C | 71 mm | 92% | 5.6 m/s | 0.5 |
| 1999 | 6.5°C | 4.8°C | 3.2°C | 11.7°C | -0.5°C | 67 mm | 92% | 6.5 m/s | 0.6 |
| 1998 | 7.2°C | 5.6°C | 4.0°C | 11.4°C | 0.0°C | 96 mm | 93% | 5.3 m/s | 0.5 |
| 1997 | 7.8°C | 6.3°C | 4.8°C | 12.3°C | 1.4°C | 90 mm | 91% | 5.7 m/s | 0.4 |
| 1996 | 5.4°C | 4.0°C | 2.5°C | 10.5°C | -1.2°C | 54 mm | 87% | 5 m/s | 0.5 |
| 1995 | 5.2°C | 4.0°C | 2.7°C | 9.8°C | -0.9°C | 74 mm | 86% | 4.6 m/s | 0.5 |
| 1994 | 8.7°C | 6.7°C | 4.7°C | 12.4°C | -0.7°C | 68 mm | 92% | 6 m/s | 0.6 |
| 1993 | 7.0°C | 5.1°C | 3.2°C | 12.4°C | 0.5°C | 101 mm | 92% | 6.6 m/s | 0.5 |
| 1992 | 6.2°C | 4.5°C | 2.8°C | 11.1°C | -0.9°C | 49 mm | 91% | 4.6 m/s | 0.6 |
| 1991 | 6.2°C | 4.5°C | 2.9°C | 11.8°C | -1.9°C | 35 mm | 91% | 4.4 m/s | 0.6 |
| 1990 | 6.6°C | 5.0°C | 3.3°C | 10.3°C | 1.1°C | 50 mm | 89% | 5.7 m/s | 0.6 |
| 1989 | 7.5°C | 6.0°C | 4.5°C | 11.6°C | 1.8°C | 90 mm | 91% | 4.4 m/s | 0.6 |
| 1988 | 8.1°C | 6.5°C | 4.9°C | 11.0°C | 1.7°C | 28 mm | 94% | 5.4 m/s | 0.5 |
| 1987 | 7.6°C | 6.2°C | 4.7°C | 11.4°C | 0.3°C | 30 mm | 91% | 4.7 m/s | 0.6 |
| 1986 | 7.5°C | 5.8°C | 4.0°C | 12.8°C | 1.1°C | 85 mm | 92% | 6.7 m/s | 0.6 |
| 1985 | 7.7°C | 6.4°C | 5.1°C | 11.6°C | -0.8°C | 91 mm | 93% | 5.5 m/s | 0.6 |
| 1984 | 7.1°C | 5.6°C | 4.0°C | 11.6°C | 0.2°C | 55 mm | 94% | 4.7 m/s | 0.6 |
| 1983 | 7.0°C | 5.3°C | 3.7°C | 11.3°C | 0.6°C | 60 mm | 93% | 5.9 m/s | — |
| 1982 | 6.2°C | 4.3°C | 2.5°C | 11.0°C | -0.7°C | 45 mm | 92% | 5.5 m/s | — |
| 1981 | 3.4°C | 1.9°C | 0.4°C | 8.9°C | -3.7°C | 51 mm | 89% | 4.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 7.1°C with lows near 4°C (mean 5.6°C), based on 45 years of NASA POWER data.
December averages 68 mm of rainfall in King's Lynn, about average for rainfall. The wettest on record was 118 mm in 2017.
The hottest December reached 12.8°C in 1986. The coldest dipped to -3.7°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.8°C. Daytime highs moved from 6.3°C to 8°C and overnight lows from 3.1°C to 5°C over the same span.
December is one of the cooler months of the year in King's Lynn and about average for rainfall, so plan for around 7.1°C daytime highs and 4°C at night.
Not quite — December is the 3rd coolest month in King's Lynn, averaging 5.6°C.
For December in King's Lynn, pack warm layers and a jacket for chilly mornings, with typical highs of 7.1°C and lows of 4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 92% — quite humid.
Average wind speed in December is 5.3 m/s. The windiest December on record averaged 6.7 m/s (1986).
The wettest December on record was 2017 with 118 mm. On average, December sees 68 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 King's Lynn 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.
