Osan, South Korea

Full City Profile

238,788 Population 14,463/sq mi density

72 ft Elevation 22 meters

53°F Avg Temperature 12°C

Osan experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 26°F in January while summers reach 77°F in July. The area gets 244 sunny days per year. Annual precipitation totals 50.9 inches. The area receives 3.3 inches of snow annually.

Temperature

26°F Jan (-3°C) 77°F Jul (25°C)

Annual Average	52.9°F
	2% below US avg
January Average	26°F (-3°C)
July Average	77°F (25°C)
Sunny Days	244 days/yr

Geography

Elevation	72 ft (22 m)
Area	16.5 sq mi (42.8 km²)
Population Density	14,463/sq mi
Coordinates	37.1522°N, 127.0706°W
Timezone	Asia/Seoul

Precipitation & Snow

Annual Rainfall 50.9"

34% above US avg

Snowfall 3.3"

Wettest Month (Jul) 12.64"

Driest Month (Jan) 1.02"

Air Quality

Earthquake History

3 earthquakes (M2.5+) within 150 km since 1990. Strongest: M4.7. Most recent: M3.6 on Jan 8, 2023.

Jan 20, 2007	25 km NNE of Pyeongchang, South Korea	M4.7	134 km
Jan 8, 2023	South Korea	M3.6	101 km
Jan 29, 2020	21 km WNW of Mungyeong, South Korea	M3.5	97 km

Source: USGS (M2.5+, 1990–2025)

Hurricane History

12 hurricanes (Cat 1+) within 500 km since 1980. Strongest: Category 2.

Year	Name	Category	Closest
2022	Hinnamnor	Category 1	289 km
2020	Bavi	Category 2	202 km
2020	Maysak	Category 1	198 km
2020	Haishen	Category 1	181 km
2019	Lingling	Category 2	185 km
2012	Sanba	Category 1	250 km
2010	Kompasu	Category 2	88 km
2007	Nari	Category 1	296 km
2003	Maemi	Category 2	222 km
2000	Prapiroon	Category 1	175 km
1999	Olga	Category 1	237 km
1995	Faye	Category 2	150 km

Source: NOAA IBTrACS (Cat 1+, 1980–2026)

Tsunami History

1 tsunami recorded within 500 km.

Year	Location	Cause	Max Wave	Deaths	Distance
1700	YELLOW SEA	Earthquake	—	—	89 km

Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.

Nearby Volcanoes

1 volcano within 200 km. Closest: Ch'uga-ryong (133 km).

Name	Type	Elevation	Last Eruption	Distance
Ch'uga-ryong	Shield	452 m (1,483 ft)	Unknown	133 km

Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	26°F (-3°C)	1.0 in	Coldest, Driest
February	30°F (-1°C)	1.2 in
March	40°F (5°C)	1.9 in
April	53°F (12°C)	3.5 in
May	63°F (17°C)	3.7 in
June	71°F (22°C)	5.2 in
July	77°F (25°C)	12.6 in	Wettest
August	77°F (25°C)	10.6 in	Warmest
September	68°F (20°C)	5.9 in
October	56°F (13°C)	2.1 in
November	43°F (6°C)	2.1 in
December	31°F (-0°C)	1.1 in

Osan has a seasonal temperature swing of 51°F / from 26°F in January to 77°F in August. Total annual precipitation is 50.9 inches, with July being the wettest month (12.6") and January the driest (1.0").

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