December is one of the cooler months of the year in Rhyl, with average highs near 8.2°C and lows around 5.8°C (mean 7°C). It is a relatively wet time of year, averaging 112 mm of rainfall and 87% relative humidity across the period.
December is one of the cooler months of the year in Rhyl. Across 45 years of records, the warmest December in Rhyl was 2015 — when the month averaged 9.7°C — while the coldest was 1981 at 3.5°C. Typical December days reach 8.2°C with nights near 5.8°C. The long-term trend is warming, about 0.4°C per decade.
December is a relatively wet time of year in Rhyl, averaging 112 mm of rainfall. The wettest December on record was 2015 with 211 mm, while the driest were 1987 and 2010 at 55 mm.
Relative humidity in Rhyl during December averages 87%. The most humid Decembers were 2016 and 2018 at 90%, and the least humid was 1999 at 84%.
December receives about 0.5 kWh/m²/day of solar energy in Rhyl. The sunniest Decembers were 2008, 2010 and 2022, among others at 0.6 kWh/m²/day, and the cloudiest were 2011, 2015 and 2021, among others at 0.4.
Average wind speed in Rhyl during December is 6.4 m/s. The windiest Decembers were 2011 and 2015 at 8 m/s, while the calmest was 2010 at 4.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.6°C | 6.5°C | 7.0°C | 7.4°C | 7.7°C | +1.1°C |
| Avg High | 7.8°C | 7.8°C | 8.2°C | 8.6°C | 8.8°C | +1°C |
| Avg Low | 5.5°C | 5.3°C | 5.8°C | 6.2°C | 6.6°C | +1.1°C |
| Avg Rain | 102 mm | 107 mm | 102 mm | 119 mm | 141 mm | +39 mm |
December temperatures in Rhyl have risen by about 1.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -1.5°C (1995) to a record high of 13.9°C (2025).
Rainfall in December is a relatively wet time of year, averaging 112 mm, with a wettest year of 211 mm.
A quieter season to visit Rhyl
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Rhyl. That said, December — with days averaging 8.2°C and nights around 5.8°C (mean 7°C) and higher rainfall (112 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 | 9.2°C | 8.3°C | 7.3°C | 13.9°C | 4.1°C | 136 mm | 88% | 6.3 m/s | — |
| 2024 | 9.5°C | 8.4°C | 7.3°C | 12.3°C | 4.3°C | 138 mm | 88% | 6.6 m/s | 0.5 |
| 2023 | 9.4°C | 8.4°C | 7.4°C | 12.0°C | 3.5°C | 149 mm | 87% | 7.4 m/s | 0.5 |
| 2022 | 7.5°C | 6.4°C | 5.4°C | 12.6°C | 1.5°C | 91 mm | 86% | 5.3 m/s | 0.6 |
| 2021 | 8.7°C | 7.5°C | 6.3°C | 12.1°C | 2.7°C | 135 mm | 89% | 5.9 m/s | 0.4 |
| 2020 | 8.3°C | 7.2°C | 6.1°C | 12.3°C | 3.4°C | 194 mm | 87% | 6 m/s | 0.5 |
| 2019 | 8.8°C | 7.5°C | 6.2°C | 12.6°C | 3.9°C | 99 mm | 88% | 6.3 m/s | 0.5 |
| 2018 | 9.3°C | 8.1°C | 7.0°C | 11.9°C | 2.0°C | 139 mm | 90% | 5.9 m/s | 0.5 |
| 2017 | 8.2°C | 7.1°C | 6.0°C | 12.3°C | 2.4°C | 109 mm | 87% | 6.1 m/s | 0.5 |
| 2016 | 9.1°C | 8.0°C | 6.8°C | 12.1°C | 2.8°C | 60 mm | 90% | 5.3 m/s | 0.5 |
| 2015 🔥 🌧️ | 11.3°C | 9.7°C | 8.1°C | 13.4°C | 4.2°C | 211 mm | 87% | 8 m/s | 0.4 |
| 2014 | 8.6°C | 7.5°C | 6.5°C | 11.5°C | 3.4°C | 107 mm | 85% | 7.1 m/s | 0.5 |
| 2013 | 9.3°C | 8.0°C | 6.6°C | 12.1°C | 4.5°C | 81 mm | 86% | 7.6 m/s | 0.5 |
| 2012 | 7.6°C | 6.4°C | 5.2°C | 10.9°C | 1.0°C | 177 mm | 88% | 6.4 m/s | 0.5 |
| 2011 | 8.8°C | 7.7°C | 6.5°C | 11.4°C | 3.7°C | 154 mm | 85% | 8 m/s | 0.4 |
| 2010 | 4.6°C | 3.6°C | 2.6°C | 8.3°C | -0.5°C | 55 mm | 85% | 4.4 m/s | 0.6 |
| 2009 | 6.9°C | 5.8°C | 4.8°C | 11.4°C | 1.8°C | 109 mm | 86% | 5.6 m/s | 0.5 |
| 2008 | 7.1°C | 6.1°C | 5.0°C | 10.7°C | 0.6°C | 79 mm | 87% | 5.4 m/s | 0.6 |
| 2007 | 8.4°C | 7.1°C | 5.8°C | 12.8°C | 1.3°C | 114 mm | 88% | 6.8 m/s | 0.5 |
| 2006 | 9.7°C | 8.4°C | 7.0°C | 12.7°C | 2.2°C | 135 mm | 86% | 6.8 m/s | 0.5 |
| 2005 | 8.5°C | 7.5°C | 6.5°C | 10.8°C | 2.0°C | 78 mm | 87% | 5.4 m/s | 0.5 |
| 2004 | 9.2°C | 8.1°C | 6.9°C | 11.0°C | 4.0°C | 87 mm | 87% | 6.2 m/s | 0.5 |
| 2003 | 8.4°C | 7.0°C | 5.6°C | 11.8°C | 1.6°C | 105 mm | 88% | 5.8 m/s | 0.5 |
| 2002 | 7.5°C | 6.6°C | 5.6°C | 11.1°C | 2.7°C | 130 mm | 90% | 6 m/s | 0.5 |
| 2001 | 7.8°C | 6.3°C | 4.9°C | 12.0°C | 2.9°C | 65 mm | 86% | 6 m/s | 0.6 |
| 2000 | 8.1°C | 7.1°C | 6.2°C | 12.6°C | 0.7°C | 120 mm | 88% | 6.6 m/s | 0.5 |
| 1999 | 8.0°C | 6.9°C | 5.7°C | 11.2°C | 2.2°C | 161 mm | 84% | 7.8 m/s | 0.5 |
| 1998 | 9.0°C | 7.6°C | 6.2°C | 12.5°C | 2.9°C | 86 mm | 87% | 6.5 m/s | 0.5 |
| 1997 | 9.0°C | 7.9°C | 6.7°C | 12.7°C | 2.1°C | 134 mm | 88% | 6.7 m/s | 0.4 |
| 1996 | 6.2°C | 4.9°C | 3.6°C | 10.6°C | 0.8°C | 56 mm | 89% | 5.8 m/s | 0.5 |
| 1995 | 5.8°C | 4.6°C | 3.4°C | 11.7°C | -1.5°C | 64 mm | 87% | 5.7 m/s | 0.5 |
| 1994 | 9.6°C | 8.2°C | 6.8°C | 12.9°C | 3.3°C | 137 mm | 86% | 7.4 m/s | 0.5 |
| 1993 | 8.1°C | 6.7°C | 5.3°C | 11.6°C | 2.6°C | 167 mm | 86% | 7.8 m/s | 0.4 |
| 1992 | 7.1°C | 5.8°C | 4.6°C | 11.3°C | 0.2°C | 84 mm | 86% | 5.7 m/s | 0.5 |
| 1991 | 7.8°C | 6.6°C | 5.5°C | 11.6°C | 1.0°C | 60 mm | 88% | 5.8 m/s | 0.5 |
| 1990 | 7.4°C | 6.1°C | 4.8°C | 10.6°C | 1.7°C | 124 mm | 84% | 6.5 m/s | 0.5 |
| 1989 | 7.0°C | 5.8°C | 4.6°C | 11.1°C | 1.1°C | 100 mm | 88% | 5.6 m/s | 0.5 |
| 1988 | 9.6°C | 8.6°C | 7.6°C | 11.5°C | 3.5°C | 74 mm | 89% | 6.6 m/s | 0.4 |
| 1987 | 7.6°C | 6.6°C | 5.6°C | 11.5°C | 1.1°C | 55 mm | 90% | 6 m/s | 0.5 |
| 1986 | 8.6°C | 7.2°C | 5.9°C | 13.4°C | 3.4°C | 165 mm | 85% | 7.8 m/s | 0.5 |
| 1985 | 8.6°C | 7.5°C | 6.4°C | 13.2°C | 0.8°C | 104 mm | 87% | 6.3 m/s | 0.5 |
| 1984 | 8.2°C | 7.1°C | 5.9°C | 11.0°C | 2.3°C | 106 mm | 88% | 6.1 m/s | 0.5 |
| 1983 | 8.8°C | 7.5°C | 6.2°C | 11.8°C | 2.9°C | 132 mm | 88% | 6.9 m/s | — |
| 1982 | 7.4°C | 6.0°C | 4.7°C | 11.0°C | 2.4°C | 107 mm | 86% | 6.7 m/s | — |
| 1981 ❄️ | 4.5°C | 3.5°C | 2.4°C | 9.7°C | -0.9°C | 76 mm | 85% | 5.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 8.2°C with lows near 5.8°C (mean 7°C), based on 45 years of NASA POWER data.
December averages 112 mm of rainfall in Rhyl, a relatively wet time of year. The wettest on record was 211 mm in 2015.
The hottest December reached 13.9°C in 2025. The coldest dipped to -1.5°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.5°C. Daytime highs moved from 7.5°C to 8.9°C and overnight lows from 5.1°C to 6.7°C over the same span.
December is one of the cooler months of the year in Rhyl and a relatively wet time of year, so plan for around 8.2°C daytime highs and 5.8°C at night.
Not quite — December is the 4th coolest month in Rhyl, averaging 7°C.
For December in Rhyl, pack warm layers and a jacket for chilly mornings, with typical highs of 8.2°C and lows of 5.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 87% — quite humid.
Average wind speed in December is 6.4 m/s. The windiest December on record averaged 8 m/s (2011).
The wettest December on record was 2015 with 211 mm. On average, December sees 112 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 Rhyl 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.
