Yesan climate — normals and trends
Yesan (South Korea) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.5 °C and it receives 1,126 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 (25.9 °C on average) and the coldest is January (-1.9 °C). Rainfall peaks in July.
Yesan averages 99 frost days, 34 hot days (≥ 30 °C) and 100 rainy days per year.
Yesan has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 109 to 89 per year over the period.
The hottest day of the period reached 39.3 °C (on 15 August 2018) and the coldest -20.0 °C (on 11 February 1941).
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
YesanChungcheongnam-do
- coords
- 36.68°, 126.84°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.5°C
Average daily high
17.1°C
Average daily low
8.3°C
Annual rainfall
1,126mm
Sunshine / day
8.6h
Mean relative humidity
72%
Average peak wind
14.9km/h
Seasonal range
27.8°C
Frost days (< 0 °C)
99 d/yr
Hot days (≥ 30 °C)
34 d/yr
Rainy days (≥ 1 mm)
100 d/yr
Annual snowfall
23.1 cm
Average feels-like high
16.3 °C
Average feels-like low
6.9 °C
Average peak gust
34.6 km/h
Tropical nights (≥ 20 °C)
63 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.48 · 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
39.3 °C
15 August 2018
Coldest day
-20.0 °C
11 February 1941
Wettest day
192 mm
30 September 1998
Windiest day
54.0 km/h
28 August 2012
Strongest gust
120.6 km/h
28 August 2012
Hottest feels-like
45.3 °C
3 August 1959
Coldest feels-like
-25.3 °C
18 January 1945
Snowiest day
20.4 cm
7 January 2001
Sunniest day
14.1 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 | 22 mm | -4 mm |
| Feb | 3.8 °C | -0.6 °C | 11 mm | -17 mm |
| Mar | 13.2 °C | +2.9 °C | 49 mm | +3 mm |
| Apr | 18.9 °C | +1.3 °C | 68 mm | -5 mm |
| May | 22.5 °C | -0.7 °C | 72 mm | -8 mm |
| Jun | 28.3 °C | +1.3 °C | 135 mm | +11 mm |
| Jul | 32.5 °C | +3.6 °C | 201 mm | -59 mm |
| Aug | 31.6 °C | +1.9 °C | 209 mm | -4 mm |
| Sep | 27.1 °C | +1.7 °C | 308 mm | +161 mm |
| Oct | 20.8 °C | +1.2 °C | 173 mm | +121 mm |
| Nov | 14.3 °C | +2.1 °C | 20 mm | -27 mm |
| Dec | 6.2 °C | +1.3 °C | 39 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 Yesan?
Yesan has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 1,126 mm of precipitation per year.
What is the hottest day ever recorded in Yesan?
The hottest day measured in Yesan between 1940 and 2025 was 15 August 2018, reaching 39.3 °C.
What is the coldest day in Yesan?
The coldest day measured in Yesan between 1940 and 2025 was 11 February 1941, at -20.0 °C.
Does it snow in Yesan?
Yes. Yesan gets on average 23.1 cm of snow per year and has around 99 frost days.
Has the climate of Yesan warmed?
Yes: Yesan warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Yesan?
The wettest day measured in Yesan between 1940 and 2025 was 30 September 1998, with 192 mm of rain in 24 hours.
What was the windiest day in Yesan?
The windiest day measured in Yesan between 1940 and 2025 was 28 August 2012, with winds reaching 54.0 km/h.
What is the warmest month in Yesan?
The warmest month in Yesan is August (25.9 °C on average); the coldest is January (-1.9 °C).
How much does it rain in Yesan?
Yesan receives on average 1,126 mm of precipitation per year, spread over about 100 rainy days.
Is it sunny in Yesan?
Yesan gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Yesan?
The heaviest 24-hour snowfall measured in Yesan between 1940 and 2025 was 7 January 2001, with 20.4 cm.
Are there tropical nights in Yesan?
Yes: Yesan has on average 63 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Yesan?
In Yesan, between 1940 and 2025, the highest apparent temperature reached 45.3 °C on 3 August 1959, and the lowest was -25.3 °C on 18 January 1945.
Compare Yesan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Yesan