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Weather & Climate in Castletown, Ireland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Castletown experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 41°F in January while summers reach 59°F in July / relatively mild seasonal variation. The area gets 263 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 40.3 inches. The city sits at an elevation of 79 feet.
Temperature
41°F Jan (5°C)
59°F Jul (15°C)
| Annual Average | 49.2°F |
| 9% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 59°F (15°C) |
| Sunny Days | 263 days/yr |
Geography
| Elevation | 79 ft (24 m) |
| Area | 228.1 sq mi (590.8 km²) |
| Population Density | 5/sq mi |
| Coordinates | 52.7223°N, 6.1891°W |
| Timezone | Europe/Dublin |
Precipitation & Snow
Air Quality
Earthquake History
5 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| May 29, 2013 | 14 km WSW of Nefyn, United Kingdom | M3.8 | 100 km | 10 km |
| Jul 29, 1992 | 8 km WNW of Caernarfon, United Kingdom | M3.5 | 130 km | 10 km |
| May 26, 2015 | 6 km WSW of Caernarfon, United Kingdom | M3.0 | 131 km | 9 km |
| Jun 26, 2013 | 14 km WSW of Nefyn, United Kingdom | M2.8 | 100 km | 8 km |
| Oct 16, 1998 | 1 km WSW of Y Felinheli, United Kingdom | M2.7 | 141 km | 12 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 4.4 in | Coldest |
| February | 42°F (5°C) | 3.4 in | |
| March | 44°F (7°C) | 3.1 in | |
| April | 46°F (8°C) | 2.6 in | |
| May | 51°F (10°C) | 2.8 in | |
| June | 56°F (13°C) | 2.4 in | Driest |
| July | 59°F (15°C) | 2.4 in | Warmest |
| August | 59°F (15°C) | 3.3 in | |
| September | 56°F (13°C) | 3.5 in | |
| October | 51°F (10°C) | 4.2 in | |
| November | 45°F (7°C) | 4.0 in | |
| December | 43°F (6°C) | 4.4 in | Wettest |
Castletown has a seasonal temperature swing of 18°F / from 41°F in January to 59°F in July. Total annual precipitation is 40.3 inches, with December being the wettest month (4.4") and June the driest (2.4").