How extreme does Cheonan's weather get?

The hottest, coldest, wettest and snowiest days Cheonan has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 16 years of daily weather observations (2009–present), from the Cheonan station 13 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Cheonan has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

99°F Aug 1, 2018

The three most extreme on record

1 99°F Aug 1, 2018

2 98°F Aug 15, 2018

3 98°F Aug 5, 2012

❄️ Coldest night

-5°F Jan 12, 2018

The three most extreme on record

1 -5°F Jan 12, 2018

2 -5°F Jan 9, 2021

3 -3°F Jan 14, 2010

🌧️ Most rain in one day

7.20 in Aug 3, 2020

The three most extreme on record

1 7.20 in Aug 3, 2020

2 6.22 in Jun 24, 2011

3 5.40 in Jul 4, 2017

In plain terms

Across the record, Cheonan has reached as high as 99°F and as low as −5°F. A single day has delivered over 7 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at A 511 / Desiderio Aaf-pyeongtaek / Camp Humphreys Rok, a weather station, about 21 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →

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