Gunsan climate — normals and trends
Gunsan (South Korea) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.3 °C and it receives 1,187 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 (26.3 °C on average) and the coldest is January (0.1 °C). Rainfall peaks in July.
Gunsan averages 62 frost days, 15 hot days (≥ 30 °C) and 102 rainy days per year.
Gunsan 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 70 to 54 per year over the period.
The hottest day of the period reached 35.6 °C (on 19 August 1951) and the coldest -15.8 °C (on 18 January 1945).
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
GunsanJeollabuk-do
- coords
- 35.98°, 126.71°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.3°C
Average daily high
16.3°C
Average daily low
10.6°C
Annual rainfall
1,187mm
Sunshine / day
8.6h
Mean relative humidity
75%
Average peak wind
17.4km/h
Seasonal range
26.2°C
Frost days (< 0 °C)
62 d/yr
Hot days (≥ 30 °C)
15 d/yr
Rainy days (≥ 1 mm)
102 d/yr
Annual snowfall
17.4 cm
Average feels-like high
15.8 °C
Average feels-like low
9.2 °C
Average peak gust
32.9 km/h
Tropical nights (≥ 20 °C)
83 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
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
35.6 °C
19 August 1951
Coldest day
-15.8 °C
18 January 1945
Wettest day
199 mm
30 September 1998
Windiest day
65.2 km/h
28 August 2012
Strongest gust
125.3 km/h
28 August 2012
Hottest feels-like
42.8 °C
5 August 2017
Coldest feels-like
-21.1 °C
18 January 1945
Snowiest day
9.9 cm
31 December 1966
Sunniest day
14.0 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 | 5.0 °C | +1.9 °C | 27 mm | -2 mm |
| Feb | 3.8 °C | -0.8 °C | 18 mm | -15 mm |
| Mar | 11.5 °C | +2.3 °C | 46 mm | -5 mm |
| Apr | 16.7 °C | +1.3 °C | 67 mm | -16 mm |
| May | 20.3 °C | -0.2 °C | 112 mm | +18 mm |
| Jun | 25.6 °C | +1.5 °C | 318 mm | +173 mm |
| Jul | 30.8 °C | +3.4 °C | 248 mm | -23 mm |
| Aug | 30.5 °C | +1.7 °C | 160 mm | -39 mm |
| Sep | 27.0 °C | +2.0 °C | 255 mm | +110 mm |
| Oct | 21.3 °C | +2.0 °C | 186 mm | +131 mm |
| Nov | 14.1 °C | +1.5 °C | 14 mm | -36 mm |
| Dec | 7.3 °C | +1.2 °C | 39 mm | +7 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 Gunsan?
Gunsan has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.3 °C and it receives 1,187 mm of precipitation per year.
What is the hottest day ever recorded in Gunsan?
The hottest day measured in Gunsan between 1940 and 2025 was 19 August 1951, reaching 35.6 °C.
What is the coldest day in Gunsan?
The coldest day measured in Gunsan between 1940 and 2025 was 18 January 1945, at -15.8 °C.
Does it snow in Gunsan?
Yes. Gunsan gets on average 17.4 cm of snow per year and has around 62 frost days.
Has the climate of Gunsan warmed?
Yes: Gunsan warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Gunsan?
The wettest day measured in Gunsan between 1940 and 2025 was 30 September 1998, with 199 mm of rain in 24 hours.
What was the windiest day in Gunsan?
The windiest day measured in Gunsan between 1940 and 2025 was 28 August 2012, with winds reaching 65.2 km/h.
What is the warmest month in Gunsan?
The warmest month in Gunsan is August (26.3 °C on average); the coldest is January (0.1 °C).
How much does it rain in Gunsan?
Gunsan receives on average 1,187 mm of precipitation per year, spread over about 102 rainy days.
Is it sunny in Gunsan?
Gunsan 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 Gunsan?
The heaviest 24-hour snowfall measured in Gunsan between 1940 and 2025 was 31 December 1966, with 9.9 cm.
Are there tropical nights in Gunsan?
Yes: Gunsan has on average 83 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Gunsan?
In Gunsan, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 5 August 2017, and the lowest was -21.1 °C on 18 January 1945.
Compare Gunsan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Gunsan