Ystrad Mynach Weather in December
What's the weather like in Ystrad Mynach (Wales) in December 2025?
The climate in Ystrad Mynach during December can be summarized as cool and wet.
December is in the winter in Ystrad Mynach and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cool 8°C (46°F), whilst at night 2°C (36°F) is normal.
| Daytime temperature | 7.7°C 45.8°F |
|---|---|
| Nightly temperature | 2.4°C 36.2°F |
| Average temperature | 5°C 41°F |
| Daily sunshine | 1.7 hrs |
| Avg rainfall | 148 mm 5.8 ins |
| Rainy days | 20 days |
| Sea temperature | 11.6°C 52.9°F |
| Humidity | 92% |
| Windspeed | 19.8kph 12 mph |
On average December is the wettest month of the year in Ystrad Mynach with around 148mm 5.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 1.7 hours of sunshine per day.
December temperatures in Ystrad Mynach
December rainfall
December hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Ystrad Mynach in December 2025.
Other monthly averages
Best places to visit in December
Ystrad Mynach weather stats
| Hottest month: | July | 19.6°C 67.3°F |
|---|---|---|
| Driest month: | July | 75mm 3ins |
| Sunniest month: | August | 6.3hrs |
| Coldest month: | February | 6.4°C 43.5°F |
| Wettest month: | December | 148mm 5.8ins |
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