Cheonan climate — normals and trends
Cheonan (South Korea) has a hot-summer humid continental, dry winter climate (Dwa) under the Köppen-Geiger classification. Its mean annual temperature is 12.3 °C and it receives 1,195 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (25.7 °C on average) and the coldest is January (-2.3 °C). Rainfall peaks in July.
Cheonan averages 105 frost days, 36 hot days (≥ 30 °C) and 100 rainy days per year.
Cheonan has warmed by +2.1 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 116 to 94 per year over the period.
The hottest day of the period reached 39.9 °C (on 15 August 2018) and the coldest -22.6 °C (on 29 December 2000).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
CheonanChungcheongnam-do
- coords
- 36.81°, 127.15°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.3°C
Average daily high
17.2°C
Average daily low
7.9°C
Annual rainfall
1,195mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
14.3km/h
Seasonal range
28.0°C
Frost days (< 0 °C)
105 d/yr
Hot days (≥ 30 °C)
36 d/yr
Rainy days (≥ 1 mm)
100 d/yr
Annual snowfall
19.4 cm
Average feels-like high
16.3 °C
Average feels-like low
6.4 °C
Average peak gust
33.0 km/h
Tropical nights (≥ 20 °C)
61 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.2 °C per decade · r² = 0.53 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
39.9 °C
15 August 2018
Coldest day
-22.6 °C
29 December 2000
Wettest day
194 mm
21 September 2024
Windiest day
48.6 km/h
7 September 2019
Strongest gust
117.7 km/h
28 August 1986
Hottest feels-like
44.5 °C
13 August 2018
Coldest feels-like
-28.2 °C
18 January 1945
Snowiest day
21.5 cm
5 March 2004
Sunniest day
14.2 h
28 June 1951
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 4.2 °C | +2.1 °C | 14 mm | -11 mm |
| Feb | 3.9 °C | -0.8 °C | 10 mm | -20 mm |
| Mar | 13.6 °C | +2.9 °C | 52 mm | -1 mm |
| Apr | 20.1 °C | +2.0 °C | 70 mm | -13 mm |
| May | 23.2 °C | -0.4 °C | 85 mm | -7 mm |
| Jun | 29.1 °C | +2.0 °C | 181 mm | +45 mm |
| Jul | 32.4 °C | +3.4 °C | 234 mm | -47 mm |
| Aug | 31.8 °C | +2.1 °C | 154 mm | -63 mm |
| Sep | 27.1 °C | +1.7 °C | 291 mm | +140 mm |
| Oct | 20.7 °C | +1.1 °C | 201 mm | +147 mm |
| Nov | 14.4 °C | +2.3 °C | 14 mm | -33 mm |
| Dec | 6.0 °C | +1.4 °C | 37 mm | +10 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Cheonan?
Cheonan has a hot-summer humid continental, dry winter climate (Köppen Dwa). Over 1940-2025, the average annual temperature is 12.3 °C and it receives 1,195 mm of precipitation per year.
What is the hottest day ever recorded in Cheonan?
The hottest day measured in Cheonan between 1940 and 2025 was 15 August 2018, reaching 39.9 °C.
What is the coldest day in Cheonan?
The coldest day measured in Cheonan between 1940 and 2025 was 29 December 2000, at -22.6 °C.
Does it snow in Cheonan?
Yes. Cheonan gets on average 19.4 cm of snow per year and has around 105 frost days.
Has the climate of Cheonan warmed?
Yes: Cheonan warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Cheonan?
The wettest day measured in Cheonan between 1940 and 2025 was 21 September 2024, with 194 mm of rain in 24 hours.
What was the windiest day in Cheonan?
The windiest day measured in Cheonan between 1940 and 2025 was 7 September 2019, with winds reaching 48.6 km/h.
What is the warmest month in Cheonan?
The warmest month in Cheonan is August (25.7 °C on average); the coldest is January (-2.3 °C).
How much does it rain in Cheonan?
Cheonan receives on average 1,195 mm of precipitation per year, spread over about 100 rainy days.
Is it sunny in Cheonan?
Cheonan gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Cheonan?
The heaviest 24-hour snowfall measured in Cheonan between 1940 and 2025 was 5 March 2004, with 21.5 cm.
Are there tropical nights in Cheonan?
Yes: Cheonan has on average 61 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Cheonan?
In Cheonan, between 1940 and 2025, the highest apparent temperature reached 44.5 °C on 13 August 2018, and the lowest was -28.2 °C on 18 January 1945.
Compare Cheonan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Cheonan