Seonsan climate — normals and trends
Seonsan (South Korea) has a hot-summer humid continental, dry winter climate (Dwa) under the Köppen-Geiger classification. Its mean annual temperature is 12.5 °C and it receives 1,077 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 (25.6 °C on average) and the coldest is January (-1.7 °C). Rainfall peaks in July.
Seonsan averages 103 frost days, 38 hot days (≥ 30 °C) and 93 rainy days per year.
Seonsan has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 119 to 87 per year over the period.
The hottest day of the period reached 38.5 °C (on 12 August 2016) and the coldest -20.9 °C (on 16 January 1967).
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
SeonsanGyeongsangbuk-do
- coords
- 36.24°, 128.30°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.5°C
Average daily high
17.6°C
Average daily low
7.9°C
Annual rainfall
1,077mm
Sunshine / day
8.5h
Mean relative humidity
68%
Average peak wind
13.8km/h
Seasonal range
27.3°C
Frost days (< 0 °C)
103 d/yr
Hot days (≥ 30 °C)
38 d/yr
Rainy days (≥ 1 mm)
93 d/yr
Annual snowfall
17.9 cm
Average feels-like high
16.5 °C
Average feels-like low
6.5 °C
Average peak gust
35.2 km/h
Tropical nights (≥ 20 °C)
58 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.65 · 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
38.5 °C
12 August 2016
Coldest day
-20.9 °C
16 January 1967
Wettest day
193 mm
5 July 2013
Windiest day
41.8 km/h
31 March 1972
Strongest gust
134.6 km/h
28 August 1986
Hottest feels-like
43.4 °C
14 August 1952
Coldest feels-like
-26.3 °C
16 January 1967
Snowiest day
16.2 cm
7 January 2001
Sunniest day
14.0 h
20 June 1944
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 | 5.2 °C | +2.1 °C | 9 mm | -14 mm |
| Feb | 5.1 °C | -0.6 °C | 11 mm | -19 mm |
| Mar | 14.2 °C | +2.6 °C | 52 mm | -3 mm |
| Apr | 21.1 °C | +2.6 °C | 60 mm | -19 mm |
| May | 23.3 °C | -0.4 °C | 89 mm | +2 mm |
| Jun | 29.3 °C | +2.3 °C | 248 mm | +116 mm |
| Jul | 32.1 °C | +3.0 °C | 142 mm | -91 mm |
| Aug | 32.9 °C | +3.1 °C | 65 mm | -116 mm |
| Sep | 27.7 °C | +2.5 °C | 165 mm | +21 mm |
| Oct | 20.5 °C | +0.7 °C | 185 mm | +134 mm |
| Nov | 15.0 °C | +2.4 °C | 7 mm | -33 mm |
| Dec | 7.1 °C | +1.6 °C | 23 mm | +0 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 Seonsan?
Seonsan has a hot-summer humid continental, dry winter climate (Köppen Dwa). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 1,077 mm of precipitation per year.
What is the hottest day ever recorded in Seonsan?
The hottest day measured in Seonsan between 1940 and 2025 was 12 August 2016, reaching 38.5 °C.
What is the coldest day in Seonsan?
The coldest day measured in Seonsan between 1940 and 2025 was 16 January 1967, at -20.9 °C.
Does it snow in Seonsan?
Yes. Seonsan gets on average 17.9 cm of snow per year and has around 103 frost days.
Has the climate of Seonsan warmed?
Yes: Seonsan warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Seonsan?
The wettest day measured in Seonsan between 1940 and 2025 was 5 July 2013, with 193 mm of rain in 24 hours.
What was the windiest day in Seonsan?
The windiest day measured in Seonsan between 1940 and 2025 was 31 March 1972, with winds reaching 41.8 km/h.
What is the warmest month in Seonsan?
The warmest month in Seonsan is August (25.6 °C on average); the coldest is January (-1.7 °C).
How much does it rain in Seonsan?
Seonsan receives on average 1,077 mm of precipitation per year, spread over about 93 rainy days.
Is it sunny in Seonsan?
Seonsan gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Seonsan?
The heaviest 24-hour snowfall measured in Seonsan between 1940 and 2025 was 7 January 2001, with 16.2 cm.
Are there tropical nights in Seonsan?
Yes: Seonsan has on average 58 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Seonsan?
In Seonsan, between 1940 and 2025, the highest apparent temperature reached 43.4 °C on 14 August 1952, and the lowest was -26.3 °C on 16 January 1967.
Compare Seonsan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Seonsan