Osan is a city of approximately 239,000 people in Gyeonggi-do, South Korea. Located in the Korea Standard Time zone at 37.2°N latitude.
In 2025, Osan recorded an average annual temperature of 55°F. The hottest temperatures reached 98°F in July; the coolest were 10°F in February. Total precipitation for the year was 53 inches, with the wettest month being September. Snowfall for the year totaled approximately 7 inches.
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