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Weather & Climate in Ystradgynlais, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ystradgynlais experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 40°F in January while summers reach 60°F in July. The area gets 193 sunny days per year. Annual precipitation totals 62.5 inches (wetter than the 38-inch national average). The area receives 3.5 inches of snow annually. The city sits at an elevation of 223 feet.
Temperature
40°F Jan (5°C)
60°F Jul (15°C)
| Annual Average | 49.9°F |
| 8% below US avg | |
| January Average | 40°F (5°C) |
| July Average | 60°F (15°C) |
| Sunny Days | 193 days/yr |
Geography
| Elevation | 223 ft (68 m) |
| Area | 2,125.6 sq mi (5,505.3 km²) |
| Population Density | 2,193/sq mi |
| Coordinates | 51.7667°N, 3.7667°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
36 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 | 139 km | 9 km |
| Apr 2, 1990 | 4 km NNE of Presteigne, United Kingdom | M4.7 | 81 km | 18 km |
| Oct 25, 1999 | 10 km N of Hirwaun, United Kingdom | M4.5 | 17 km | 10 km |
| Feb 17, 2018 | 5 km NE of Clydach, United Kingdom | M4.3 | 8 km | 12 km |
| Feb 20, 2014 | 17 km NNW of Ilfracombe, United Kingdom | M4.1 | 53 km | 3 km |
| May 31, 2001 | 20 km NNW of Flexbury, United Kingdom | M4.0 | 107 km | 29 km |
| May 29, 2013 | 14 km WSW of Nefyn, United Kingdom | M3.8 | 140 km | 10 km |
| Mar 7, 1996 | 3 km SW of Clive, United Kingdom | M3.8 | 133 km | 10 km |
| May 12, 1994 | 4 km S of Shipston on Stour, United Kingdom | M3.7 | 149 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.7 | 93 km | 7 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.6 | 93 km | 7 km |
| Jan 1, 1994 | Wales-England region, United Kingdom | M3.6 | 58 km | 10 km |
| May 30, 2022 | 2 km ESE of Prees, United Kingdom | M3.6 | 146 km | 10 km |
| Mar 17, 1994 | 5 km WNW of Newtown, United Kingdom | M3.5 | 90 km | 10 km |
| Feb 12, 2002 | 1 km SSE of Deri, United Kingdom | M3.5 | 36 km | 8 km |
| Oct 10, 2001 | 2 km SSE of Caerphilly, United Kingdom | M3.5 | 46 km | 10 km |
| Jun 20, 2002 | 3 km N of Marshfield, United Kingdom | M3.4 | 52 km | 14 km |
| Feb 24, 2023 | 1 km ENE of Brynmawr, United Kingdom | M3.4 | 42 km | 10 km |
| Sep 23, 1992 | 1 km NNE of Tiverton, United Kingdom | M3.3 | 96 km | 10 km |
| Jun 16, 1991 | 11 km WSW of Knighton, United Kingdom | M3.3 | 71 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 6.0 in | |
| February | 39°F (4°C) | 4.2 in | Coldest |
| March | 42°F (6°C) | 4.5 in | |
| April | 45°F (7°C) | 3.3 in | |
| May | 51°F (11°C) | 3.1 in | Driest |
| June | 56°F (13°C) | 3.4 in | |
| July | 60°F (15°C) | 3.3 in | Warmest |
| August | 60°F (15°C) | 4.1 in | |
| September | 56°F (13°C) | 4.6 in | |
| October | 50°F (10°C) | 5.5 in | |
| November | 45°F (7°C) | 6.1 in | Wettest |
| December | 42°F (5°C) | 6.1 in |
Ystradgynlais has a seasonal temperature swing of 21°F / from 39°F in February to 60°F in July. Total annual precipitation is 54.2 inches, with November being the wettest month (6.1") and May the driest (3.1").