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Weather & Climate in Greencastle, Ireland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Greencastle experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 41°F in January while summers reach 57°F in July / relatively mild seasonal variation. The area gets 238 sunny days per year, above the national average. Annual precipitation totals 53.9 inches (wetter than the 38-inch national average).
Temperature
41°F Jan (5°C)
57°F Jul (14°C)
| Annual Average | 48.2°F |
| 11% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 57°F (14°C) |
| Sunny Days | 238 days/yr |
Geography
| Area | 586.4 sq mi (1,518.7 km²) |
| Population Density | 1/sq mi |
| Coordinates | 55.2000°N, 6.9833°W |
| Timezone | Europe/Dublin |
Precipitation & Snow
Air Quality
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.5.
| May 3, 1998 | Scotland, United Kingdom | M3.5 | 113 km | 15 km |
| Jan 26, 1990 | 34 km N of Isle of Islay, United Kingdom | M3.0 | 108 km | 10 km |
| Aug 27, 1992 | 33 km NNE of Isle of Islay, United Kingdom | M2.7 | 113 km | 10 km |
| Nov 1, 2017 | 2 km NNW of Tarbert, United Kingdom | M2.6 | 124 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 720 | HEBRIDES (SCOTLAND) | Questionable Earthquake | — | — | 131 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 5.9 in | Coldest, Wettest |
| February | 41°F (5°C) | 4.5 in | |
| March | 43°F (6°C) | 4.5 in | |
| April | 45°F (7°C) | 3.2 in | |
| May | 50°F (10°C) | 2.8 in | Driest |
| June | 54°F (12°C) | 3.2 in | |
| July | 57°F (14°C) | 3.5 in | Warmest |
| August | 57°F (14°C) | 4.3 in | |
| September | 54°F (12°C) | 4.8 in | |
| October | 50°F (10°C) | 5.8 in | |
| November | 45°F (7°C) | 5.8 in | |
| December | 42°F (6°C) | 5.8 in |
Greencastle has a seasonal temperature swing of 16°F / from 41°F in January to 57°F in July. Total annual precipitation is 53.9 inches, with January being the wettest month (5.9") and May the driest (2.8").