With a population of around 19,800, Onsong sits in North Hamgyong, KP. The city operates in the Asia/Pyongyang time zone.
In 2025, Onsong recorded an average annual temperature of 46°F. The hottest temperatures reached 95°F in July; the coolest were -6°F in February. Total precipitation for the year was 27 inches, with the wettest month being August. Snowfall for the year totaled approximately 5 inches.
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