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Weather & Climate in Johnstown, Ireland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Johnstown experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 40°F in January while summers reach 59°F in July / relatively mild seasonal variation. The area gets 274 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 34.3 inches. The city sits at an elevation of 295 feet.
Temperature
40°F Jan (5°C)
59°F Jul (15°C)
| Annual Average | 48.5°F |
| 10% below US avg | |
| January Average | 40°F (5°C) |
| July Average | 59°F (15°C) |
| Sunny Days | 274 days/yr |
Geography
| Elevation | 295 ft (90 m) |
| Area | 0.4 sq mi (1.1 km²) |
| Population Density | 2,393/sq mi |
| Coordinates | 53.2383°N, 6.6222°W |
| Timezone | Europe/Dublin |
Precipitation & Snow
Air Quality
Earthquake History
3 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 | 133 km | 10 km |
| Jul 29, 1992 | 8 km WNW of Caernarfon, United Kingdom | M3.5 | 149 km | 10 km |
| Jun 26, 2013 | 14 km WSW of Nefyn, United Kingdom | M2.8 | 133 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 3.5 in | Coldest |
| February | 41°F (5°C) | 2.7 in | |
| March | 43°F (6°C) | 2.5 in | |
| April | 46°F (8°C) | 2.3 in | Driest |
| May | 50°F (10°C) | 2.3 in | |
| June | 55°F (13°C) | 2.4 in | |
| July | 59°F (15°C) | 2.4 in | Warmest |
| August | 58°F (15°C) | 3.0 in | |
| September | 55°F (13°C) | 3.1 in | |
| October | 50°F (10°C) | 3.4 in | |
| November | 44°F (7°C) | 3.2 in | |
| December | 42°F (5°C) | 3.6 in | Wettest |
Johnstown has a seasonal temperature swing of 18°F / from 40°F in January to 59°F in July. Total annual precipitation is 34.3 inches, with December being the wettest month (3.6") and April the driest (2.3").