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Weather & Climate in Ganghwa-gun, South Korea
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ganghwa-gun experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 74°F in July. The area gets 246 sunny days per year, above the national average. Annual precipitation totals 49.5 inches (wetter than the 38-inch national average). The area receives 2.4 inches of snow annually. The city sits at an elevation of 49 feet.
Temperature
25°F Jan (-4°C)
74°F Jul (24°C)
| Annual Average | 51.4°F |
| 5% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 74°F (24°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 49 ft (15 m) |
| Area | 16.4 sq mi (42.5 km²) |
| Population Density | 1,557/sq mi |
| Coordinates | 37.7472°N, 126.4856°W |
| Timezone | Asia/Seoul |
Precipitation & Snow
Air Quality
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.
| Nov 11, 1992 | 8 km NW of Chunghwa, North Korea | M4.3 | 146 km | 10 km |
| May 11, 2020 | 32 km E of Koksan, North Korea | M3.8 | 121 km | 10 km |
| Jun 27, 2019 | 10 km W of Chunghwa, North Korea | M3.6 | 142 km | 10 km |
| Jan 8, 2023 | South Korea | M3.6 | 23 km | 17 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
8 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2020 | Bavi | Category 2 | 81 mph | 153 km |
| 2020 | Maysak | Category 1 | 86 mph | 259 km |
| 2020 | Haishen | Category 1 | 81 mph | 246 km |
| 2019 | Lingling | Category 1 | 75 mph | 114 km |
| 2010 | Kompasu | Category 2 | 69 mph | 60 km |
| 2000 | Prapiroon | Category 1 | 81 mph | 132 km |
| 1999 | Olga | Category 1 | 63 mph | 287 km |
| 1995 | Faye | Category 2 | 69 mph | 222 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1700 | YELLOW SEA | Earthquake | — | — | 139 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Ch'uga-ryong (98 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Ch'uga-ryong | Shield | 452 m (1,483 ft) | Unknown | 98 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 0.7 in | Coldest, Driest |
| February | 29°F (-2°C) | 0.8 in | |
| March | 39°F (4°C) | 1.6 in | |
| April | 51°F (11°C) | 2.9 in | |
| May | 61°F (16°C) | 3.8 in | |
| June | 69°F (20°C) | 4.9 in | |
| July | 74°F (24°C) | 12.6 in | Wettest |
| August | 76°F (24°C) | 11.7 in | Warmest |
| September | 67°F (20°C) | 5.9 in | |
| October | 55°F (13°C) | 1.9 in | |
| November | 42°F (5°C) | 1.9 in | |
| December | 30°F (-1°C) | 0.8 in |
Ganghwa-gun has a seasonal temperature swing of 51°F / from 25°F in January to 76°F in August. Total annual precipitation is 49.5 inches, with July being the wettest month (12.6") and January the driest (0.7").