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Weather & Climate in Simwon, South Korea
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Simwon experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 35°F in January while summers reach 77°F in July. The area gets 253 sunny days per year, above the national average. Annual precipitation totals 67.6 inches (wetter than the 38-inch national average). The area receives 11.1 inches of snow annually. The city sits at an elevation of 39 feet.
Temperature
35°F Jan (2°C)
77°F Jul (25°C)
| Annual Average | 55.1°F |
| 2% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 253 days/yr |
Geography
| Elevation | 39 ft (12 m) |
| Area | 234.3 sq mi (606.9 km²) |
| Population Density | 0/sq mi |
| Coordinates | 35.5245°N, 126.5511°W |
| Timezone | Asia/Seoul |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.4.
| Jun 11, 2024 | 3 km NW of Puan, South Korea | M4.4 | 29 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
27 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2022 | Hinnamnor | Category 2 | 86 mph | 204 km |
| 2020 | Bavi | Category 3 | 98 mph | 184 km |
| 2020 | Haishen | Category 2 | 98 mph | 240 km |
| 2020 | Maysak | Category 1 | 92 mph | 213 km |
| 2019 | Lingling | Category 2 | 81 mph | 160 km |
| 2018 | Soulik | Category 1 | 81 mph | 286 km |
| 2016 | Chaba | Category 1 | 81 mph | 189 km |
| 2013 | Danas | Category 1 | 69 mph | 270 km |
| 2012 | Sanba | Category 2 | 98 mph | 157 km |
| 2010 | Kompasu | Category 3 | 81 mph | 142 km |
| 2007 | Nari | Category 1 | 86 mph | 138 km |
| 2004 | Megi | Category 1 | 75 mph | 293 km |
| 2003 | Maemi | Category 3 | 92 mph | 173 km |
| 2003 | Soudelor | Category 1 | 69 mph | 283 km |
| 2002 | Rusa | Category 1 | 81 mph | 166 km |
| 2000 | Saomai | Category 1 | 69 mph | 221 km |
| 2000 | Prapiroon | Category 1 | 81 mph | 204 km |
| 1999 | Olga | Category 1 | 69 mph | 62 km |
| 1995 | Faye | Category 3 | 81 mph | 136 km |
| 1994 | Seth | Category 1 | 58 mph | 192 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
2 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1700 | YELLOW SEA | Earthquake | — | — | 109 km |
| 1649 | YELLOW SEA | Earthquake | — | — | 50 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 1.4 in | |
| February | 35°F (1°C) | 1.7 in | Coldest |
| March | 42°F (6°C) | 2.2 in | |
| April | 53°F (12°C) | 3.5 in | |
| May | 62°F (17°C) | 3.6 in | |
| June | 70°F (21°C) | 6.5 in | |
| July | 77°F (25°C) | 10.1 in | Wettest |
| August | 78°F (26°C) | 9.0 in | Warmest |
| September | 70°F (21°C) | 5.3 in | |
| October | 59°F (15°C) | 2.1 in | |
| November | 47°F (8°C) | 2.1 in | |
| December | 37°F (3°C) | 1.3 in | Driest |
Simwon has a seasonal temperature swing of 44°F / from 35°F in February to 78°F in August. Total annual precipitation is 48.8 inches, with July being the wettest month (10.1") and December the driest (1.3").