Seosan City climate — normals and trends

Q: What is the climate of Seosan City?

Seosan City has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 1,122 mm of precipitation per year.

Q: What is the hottest day ever recorded in Seosan City?

The hottest day measured in Seosan City between 1940 and 2025 was 15 August 2018, reaching 35.7 °C.

Q: What is the coldest day in Seosan City?

The coldest day measured in Seosan City between 1940 and 2025 was 11 February 1941, at -15.5 °C.

Q: Does it snow in Seosan City?

Yes. Seosan City gets on average 25.5 cm of snow per year and has around 75 frost days.

Q: Has the climate of Seosan City warmed?

Yes: Seosan City warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Seosan City?

The wettest day measured in Seosan City between 1940 and 2025 was 30 September 1998, with 179 mm of rain in 24 hours.

Q: What was the windiest day in Seosan City?

The windiest day measured in Seosan City between 1940 and 2025 was 28 August 2012, with winds reaching 69.1 km/h.

Q: What is the warmest month in Seosan City?

The warmest month in Seosan City is August (25.5 °C on average); the coldest is January (-0.7 °C).

Q: How much does it rain in Seosan City?

Seosan City receives on average 1,122 mm of precipitation per year, spread over about 102 rainy days.

Q: Is it sunny in Seosan City?

Seosan City gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.

Seosan City (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 1,122 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 (25.5 °C on average) and the coldest is January (-0.7 °C). Rainfall peaks in July.

Seosan City averages 75 frost days, 13 hot days (≥ 30 °C) and 102 rainy days per year.

Seosan City has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.

The number of frost days there went from about 85 to 65 per year over the period.

The hottest day of the period reached 35.7 °C (on 15 August 2018) and the coldest -15.5 °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

Seosan CityChungcheongnam-do

coords: 36.78°, 126.45°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthJanuary

Mean daily temperature

12.5°C

Average daily high

16.0°C

Average daily low

9.4°C

Annual rainfall

1,122mm

Sunshine / day

8.7h

Mean relative humidity

73%

Average peak wind

18.2km/h

Seasonal range

26.2°C

Frost days (< 0 °C)

75 d/yr

Hot days (≥ 30 °C)

13 d/yr

Rainy days (≥ 1 mm)

102 d/yr

Annual snowfall

25.5 cm

Average feels-like high

15.0 °C

Average feels-like low

7.6 °C

Average peak gust

34.9 km/h

Tropical nights (≥ 20 °C)

67 d/yr

Solar radiation

15.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.6 °C

since 1940

+0.2 °C per decade · r² = 0.45 · p = < 0.001

19402025

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

35.7 °C

15 August 2018

Coldest day

-15.5 °C

11 February 1941

Wettest day

179 mm

30 September 1998

Windiest day

69.1 km/h

28 August 2012

Strongest gust

126.4 km/h

28 August 2012

Hottest feels-like

42.3 °C

3 August 1959

Coldest feels-like

-21.1 °C

25 January 1941

Snowiest day

19.6 cm

7 January 2001

Sunniest day

14.2 h

22 June 1941

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	33.9 °C10 July 2025	-8.3 °C6 February 2025	14.0 °C	1,326 mm	40	67
2024	34.0 °C14 August 2024	-7.8 °C23 January 2024	14.6 °C	1,317 mm	46	53
2023	33.2 °C8 August 2023	-12.1 °C25 January 2023	13.9 °C	1,210 mm	26	67
2022	32.5 °C29 July 2022	-11.0 °C19 December 2022	13.1 °C	1,236 mm	15	79
2021	33.2 °C24 July 2021	-13.8 °C9 January 2021	13.8 °C	1,080 mm	24	53
2020	32.5 °C25 August 2020	-7.6 °C6 February 2020	13.4 °C	1,377 mm	9	46
2019	34.5 °C10 August 2019	-6.6 °C8 February 2019	13.6 °C	775 mm	19	67
2018	35.7 °C15 August 2018	-11.5 °C26 January 2018	13.1 °C	1,066 mm	38	76
2017	32.5 °C5 August 2017	-7.0 °C14 December 2017	13.2 °C	782 mm	17	79
2016	33.5 °C13 August 2016	-11.9 °C24 January 2016	13.8 °C	804 mm	33	67
2015	32.8 °C7 August 2015	-7.9 °C9 February 2015	13.6 °C	737 mm	12	63
2014	32.7 °C2 August 2014	-7.3 °C14 December 2014	13.2 °C	900 mm	8	81
2013	32.9 °C22 August 2013	-11.8 °C8 February 2013	12.7 °C	868 mm	20	86
2012	34.4 °C6 August 2012	-9.9 °C2 February 2012	12.5 °C	1,370 mm	23	92
2011	32.0 °C19 July 2011	-10.0 °C16 January 2011	12.5 °C	1,393 mm	7	90
2010	33.2 °C9 August 2010	-10.0 °C14 January 2010	12.9 °C	957 mm	20	78
2009	31.6 °C16 August 2009	-10.9 °C25 January 2009	13.1 °C	842 mm	7	63
2008	32.9 °C10 August 2008	-9.1 °C6 December 2008	13.1 °C	826 mm	10	71
2007	32.1 °C11 August 2007	-5.4 °C2 February 2007	13.5 °C	1,418 mm	12	44
2006	32.2 °C3 August 2006	-10.2 °C4 February 2006	13.2 °C	984 mm	21	69
2005	32.4 °C5 August 2005	-9.6 °C18 December 2005	12.3 °C	1,257 mm	13	97
2004	33.7 °C11 August 2004	-11.4 °C22 January 2004	13.3 °C	1,225 mm	21	71
2003	29.4 °C25 July 2003	-12.7 °C7 January 2003	12.6 °C	1,431 mm	0	64
2002	33.2 °C27 July 2002	-6.2 °C12 February 2002	12.8 °C	1,161 mm	5	59
2001	32.1 °C17 August 2001	-11.7 °C17 January 2001	12.9 °C	810 mm	17	79
2000	31.5 °C10 August 2000	-11.8 °C27 December 2000	12.6 °C	1,279 mm	22	79
1999	31.7 °C10 August 1999	-9.7 °C20 December 1999	13.2 °C	1,416 mm	13	62
1998	31.1 °C20 September 1998	-10.3 °C24 January 1998	13.7 °C	1,479 mm	6	52
1997	32.2 °C8 August 1997	-11.0 °C22 January 1997	12.9 °C	1,075 mm	24	75
1996	31.9 °C11 August 1996	-9.2 °C2 February 1996	12.2 °C	948 mm	17	77
1995	32.1 °C14 August 1995	-7.8 °C30 January 1995	12.5 °C	968 mm	11	77
1994	34.8 °C24 July 1994	-7.2 °C19 January 1994	13.6 °C	935 mm	33	71
1993	28.1 °C9 August 1993	-6.4 °C16 December 1993	12.3 °C	1,234 mm	0	64
1992	30.7 °C30 August 1992	-5.6 °C20 January 1992	12.8 °C	1,040 mm	5	60
1991	31.4 °C20 August 1991	-10.6 °C24 February 1991	12.6 °C	1,224 mm	2	67
1990	31.9 °C8 August 1990	-14.0 °C26 January 1990	13.2 °C	1,474 mm	14	52
1989	31.5 °C4 August 1989	-6.1 °C29 January 1989	13.1 °C	1,358 mm	4	46
1988	32.0 °C10 August 1988	-7.2 °C3 February 1988	12.5 °C	813 mm	10	81
1987	29.5 °C26 June 1987	-7.3 °C13 January 1987	12.4 °C	1,490 mm	0	72
1986	30.9 °C2 August 1986	-12.7 °C12 January 1986	11.8 °C	1,103 mm	3	74
1985	32.3 °C19 August 1985	-13.8 °C14 January 1985	12.2 °C	1,449 mm	19	86
1984	32.2 °C9 August 1984	-9.8 °C25 December 1984	11.9 °C	1,029 mm	13	100
1983	31.9 °C5 August 1983	-10.0 °C13 February 1983	12.7 °C	1,125 mm	10	71
1982	31.6 °C9 July 1982	-9.3 °C29 January 1982	12.7 °C	1,011 mm	7	76
1981	32.4 °C31 July 1981	-12.3 °C23 January 1981	11.7 °C	1,244 mm	4	82
1980	27.6 °C27 July 1980	-12.4 °C6 February 1980	11.4 °C	1,438 mm	0	78
1979	31.0 °C15 August 1979	-7.5 °C5 February 1979	12.8 °C	1,365 mm	7	60
1978	33.4 °C31 July 1978	-10.0 °C1 February 1978	13.2 °C	1,184 mm	18	67
1977	32.5 °C28 July 1977	-12.3 °C16 February 1977	12.6 °C	971 mm	13	67
1976	29.8 °C21 August 1976	-9.9 °C21 January 1976	12.1 °C	1,116 mm	0	57
1975	32.3 °C30 July 1975	-6.7 °C24 December 1975	12.9 °C	1,302 mm	19	80
1974	31.4 °C19 August 1974	-11.6 °C24 January 1974	11.7 °C	1,501 mm	5	81
1973	34.2 °C18 July 1973	-10.7 °C24 December 1973	12.8 °C	875 mm	15	72
1972	33.0 °C20 July 1972	-5.3 °C19 February 1972	12.6 °C	1,429 mm	6	57
1971	31.1 °C9 August 1971	-10.1 °C5 January 1971	12.2 °C	1,288 mm	7	84
1970	31.7 °C12 August 1970	-12.6 °C5 January 1970	12.0 °C	1,022 mm	8	97
1969	30.9 °C9 August 1969	-12.3 °C3 February 1969	11.6 °C	1,266 mm	3	83
1968	31.2 °C30 June 1968	-10.7 °C12 February 1968	12.4 °C	875 mm	5	79
1967	34.1 °C9 August 1967	-12.7 °C29 December 1967	12.5 °C	865 mm	27	86
1966	32.0 °C8 August 1966	-10.2 °C20 January 1966	12.6 °C	874 mm	18	78
1965	30.1 °C2 July 1965	-9.8 °C17 January 1965	12.2 °C	1,004 mm	2	92
1964	32.9 °C2 August 1964	-8.8 °C13 February 1964	12.9 °C	1,488 mm	14	77
1963	31.4 °C7 August 1963	-11.6 °C14 February 1963	12.0 °C	1,359 mm	13	84
1962	32.4 °C6 July 1962	-8.4 °C31 December 1962	12.4 °C	1,298 mm	13	81
1961	32.5 °C18 August 1961	-11.0 °C17 January 1961	13.2 °C	1,162 mm	22	75
1960	33.4 °C21 August 1960	-9.6 °C30 December 1960	13.1 °C	1,034 mm	26	75
1959	34.3 °C4 August 1959	-12.0 °C5 January 1959	12.9 °C	1,272 mm	19	65
1958	31.7 °C25 June 1958	-12.2 °C16 January 1958	12.4 °C	1,678 mm	20	59
1957	31.4 °C18 August 1957	-10.2 °C11 February 1957	11.5 °C	1,251 mm	4	94
1956	33.7 °C2 August 1956	-11.4 °C25 December 1956	11.2 °C	1,595 mm	15	103
1955	31.4 °C10 August 1955	-10.2 °C11 January 1955	12.4 °C	926 mm	13	78
1954	31.9 °C16 August 1954	-7.3 °C3 February 1954	12.5 °C	1,479 mm	17	80
1953	33.1 °C16 August 1953	-10.8 °C1 February 1953	12.4 °C	962 mm	13	79
1952	33.0 °C17 August 1952	-9.6 °C2 February 1952	12.5 °C	912 mm	20	89
1951	33.9 °C19 August 1951	-10.6 °C13 January 1951	12.6 °C	659 mm	27	77
1950	31.3 °C13 August 1950	-11.5 °C7 January 1950	12.5 °C	1,001 mm	13	82
1949	31.4 °C17 August 1949	-8.7 °C29 December 1949	12.2 °C	867 mm	8	69
1948	30.3 °C29 August 1948	-7.7 °C28 January 1948	12.7 °C	1,517 mm	1	64
1947	29.6 °C19 August 1947	-10.9 °C19 December 1947	10.9 °C	1,064 mm	0	106
1946	34.3 °C28 July 1946	-9.6 °C29 December 1946	12.6 °C	606 mm	25	90
1945	31.4 °C3 August 1945	-14.5 °C18 January 1945	11.2 °C	1,133 mm	1	95
1944	31.1 °C6 August 1944	-8.9 °C27 December 1944	11.8 °C	873 mm	6	106
1943	30.9 °C18 August 1943	-10.9 °C12 January 1943	12.1 °C	854 mm	3	86
1942	32.0 °C25 July 1942	-10.8 °C12 February 1942	12.0 °C	366 mm	22	88
1941	31.3 °C8 August 1941	-15.5 °C11 February 1941	11.4 °C	788 mm	1	85
1940	30.6 °C1 August 1940	-11.3 °C10 January 1940	11.4 °C	1,111 mm	2	93

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?

Year

Across the whole year

Average daily high

17.5 °C

+1.5 °C

Hot days (≥ 30 °C)

40 d/yr

+27

Frost days (< 0 °C)

67 d/yr

-8

Annual rainfall

1327 mm

+205 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	4.1 °C	+1.9 °C	28 mm	-1 mm
Feb	3.2 °C	-0.6 °C	15 mm	-14 mm
Mar	11.2 °C	+2.4 °C	50 mm	+5 mm
Apr	16.2 °C	+1.0 °C	72 mm	-4 mm
May	20.0 °C	-0.5 °C	77 mm	-5 mm
Jun	25.7 °C	+1.2 °C	136 mm	+16 mm
Jul	30.4 °C	+3.2 °C	199 mm	-55 mm
Aug	30.2 °C	+1.7 °C	213 mm	+7 mm
Sep	26.5 °C	+1.8 °C	299 mm	+154 mm
Oct	20.4 °C	+1.3 °C	174 mm	+122 mm
Nov	14.0 °C	+1.9 °C	21 mm	-30 mm
Dec	6.6 °C	+1.4 °C	43 mm	+10 mm

The year's extremes

Hottest day

33.9 °C

10 Jul 2025

Coldest day

-8.3 °C

6 Feb 2025

Wettest day

72.1 mm

3 Aug 2025

Windiest day

38.7 km/h

7 Feb 2025

Strongest gust

80.3 km/h

20 Jun 2025

Hottest feels-like

41.3 °C

8 Jul 2025

Coldest feels-like

-15.1 °C

9 Jan 2025

Snowiest day

2.6 cm

27 Jan 2025

Sunniest day

13.6 h

22 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Seosan City?

Seosan City has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 1,122 mm of precipitation per year.

What is the hottest day ever recorded in Seosan City?

The hottest day measured in Seosan City between 1940 and 2025 was 15 August 2018, reaching 35.7 °C.

What is the coldest day in Seosan City?

The coldest day measured in Seosan City between 1940 and 2025 was 11 February 1941, at -15.5 °C.

Does it snow in Seosan City?

Yes. Seosan City gets on average 25.5 cm of snow per year and has around 75 frost days.

Has the climate of Seosan City warmed?

Yes: Seosan City warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Seosan City?

The wettest day measured in Seosan City between 1940 and 2025 was 30 September 1998, with 179 mm of rain in 24 hours.

What was the windiest day in Seosan City?

The windiest day measured in Seosan City between 1940 and 2025 was 28 August 2012, with winds reaching 69.1 km/h.

What is the warmest month in Seosan City?

The warmest month in Seosan City is August (25.5 °C on average); the coldest is January (-0.7 °C).

How much does it rain in Seosan City?

Seosan City receives on average 1,122 mm of precipitation per year, spread over about 102 rainy days.

Is it sunny in Seosan City?

Seosan City 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 Seosan City?

The heaviest 24-hour snowfall measured in Seosan City between 1940 and 2025 was 7 January 2001, with 19.6 cm.

Are there tropical nights in Seosan City?

Yes: Seosan City has on average 67 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Seosan City?

In Seosan City, between 1940 and 2025, the highest apparent temperature reached 42.3 °C on 3 August 1959, and the lowest was -21.1 °C on 25 January 1941.

Compare Seosan City with another city

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