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Weather & Climate in Ystrad Mynach, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ystrad Mynach experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 43°F in January while summers reach 61°F in July / relatively mild seasonal variation. The area gets 219 sunny days per year. Annual precipitation totals 52.1 inches (wetter than the 38-inch national average). The area receives 2.4 inches of snow annually. The city sits at an elevation of 377 feet.
Temperature
43°F Jan (6°C)
61°F Jul (16°C)
| Annual Average | 52.9°F |
| 2% below US avg | |
| January Average | 43°F (6°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 219 days/yr |
Geography
| Elevation | 377 ft (115 m) |
| Area | 132.3 sq mi (342.7 km²) |
| Population Density | 0/sq mi |
| Coordinates | 51.6428°N, 3.2362°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
40 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Sep 22, 2002 | 2 km ESE of Wombourn, United Kingdom | M4.8 | 123 km | 9 km |
| Apr 2, 1990 | 4 km NNE of Presteigne, United Kingdom | M4.7 | 77 km | 18 km |
| Oct 25, 1999 | 10 km N of Hirwaun, United Kingdom | M4.5 | 30 km | 10 km |
| Feb 17, 2018 | 5 km NE of Clydach, United Kingdom | M4.3 | 44 km | 12 km |
| Feb 20, 2014 | 17 km NNW of Ilfracombe, United Kingdom | M4.1 | 71 km | 3 km |
| May 31, 2001 | 20 km NNW of Flexbury, United Kingdom | M4.0 | 124 km | 29 km |
| Sep 23, 2000 | 1 km WSW of Warwick, United Kingdom | M4.0 | 132 km | 13 km |
| Mar 7, 1996 | 3 km SW of Clive, United Kingdom | M3.8 | 132 km | 10 km |
| May 12, 1994 | 4 km S of Shipston on Stour, United Kingdom | M3.7 | 118 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.7 | 64 km | 7 km |
| Jan 1, 1994 | Wales-England region, United Kingdom | M3.6 | 41 km | 10 km |
| May 30, 2022 | 2 km ESE of Prees, United Kingdom | M3.6 | 144 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.6 | 64 km | 7 km |
| Mar 17, 1994 | 5 km WNW of Newtown, United Kingdom | M3.5 | 100 km | 10 km |
| Feb 12, 2002 | 1 km SSE of Deri, United Kingdom | M3.5 | 7 km | 8 km |
| Oct 10, 2001 | 2 km SSE of Caerphilly, United Kingdom | M3.5 | 10 km | 10 km |
| Feb 24, 2023 | 1 km ENE of Brynmawr, United Kingdom | M3.4 | 19 km | 10 km |
| Jun 20, 2002 | 3 km N of Marshfield, United Kingdom | M3.4 | 14 km | 14 km |
| Sep 23, 1992 | 1 km NNE of Tiverton, United Kingdom | M3.3 | 82 km | 10 km |
| Jul 30, 1999 | 2 km ENE of Bargoed, United Kingdom | M3.3 | 6 km | 6 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.4 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2011 | PLYMOUTH, ENGLAND | Avalanche | 0.4 m | — | 128 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 43°F (6°C) | 5.4 in | |
| February | 39°F (4°C) | 3.9 in | Coldest |
| March | 42°F (5°C) | 4.1 in | |
| April | 45°F (7°C) | 3.0 in | |
| May | 51°F (11°C) | 3.0 in | |
| June | 56°F (13°C) | 3.1 in | |
| July | 61°F (16°C) | 2.8 in | Warmest, Driest |
| August | 60°F (15°C) | 3.8 in | |
| September | 55°F (13°C) | 4.4 in | |
| October | 50°F (10°C) | 4.9 in | |
| November | 44°F (7°C) | 5.4 in | |
| December | 41°F (5°C) | 5.5 in | Wettest |
Ystrad Mynach has a seasonal temperature swing of 23°F / from 39°F in February to 61°F in July. Total annual precipitation is 49.3 inches, with December being the wettest month (5.5") and July the driest (2.8").