Muan climate — normals and trends
Muan (South Korea) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.9 °C and it receives 1,171 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 (26.5 °C on average) and the coldest is January (1.7 °C). Rainfall peaks in July.
Muan averages 60 frost days, 30 hot days (≥ 30 °C) and 104 rainy days per year.
Muan has warmed by +1.7 °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 72 to 48 per year over the period.
The hottest day of the period reached 37.3 °C (on 2 August 2018) and the coldest -14.2 °C (on 9 January 2021).
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
MuanJeollanam-do
- coords
- 34.99°, 126.48°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.9°C
Average daily high
18.1°C
Average daily low
10.3°C
Annual rainfall
1,171mm
Sunshine / day
8.5h
Mean relative humidity
73%
Average peak wind
19.2km/h
Seasonal range
24.8°C
Frost days (< 0 °C)
60 d/yr
Hot days (≥ 30 °C)
30 d/yr
Rainy days (≥ 1 mm)
104 d/yr
Annual snowfall
12.2 cm
Average feels-like high
17.2 °C
Average feels-like low
8.7 °C
Average peak gust
37.8 km/h
Tropical nights (≥ 20 °C)
74 d/yr
Solar radiation
15.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.55 · 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
37.3 °C
2 August 2018
Coldest day
-14.2 °C
9 January 2021
Wettest day
158 mm
5 September 2007
Windiest day
74.2 km/h
28 August 2012
Strongest gust
146.9 km/h
28 August 2012
Hottest feels-like
43.9 °C
22 July 1994
Coldest feels-like
-18.9 °C
9 January 2021
Snowiest day
12.3 cm
11 February 1994
Sunniest day
13.8 h
27 June 1969
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 | 7.0 °C | +1.9 °C | 23 mm | -6 mm |
| Feb | 5.6 °C | -1.1 °C | 32 mm | -4 mm |
| Mar | 13.8 °C | +2.4 °C | 43 mm | -15 mm |
| Apr | 19.2 °C | +1.7 °C | 60 mm | -26 mm |
| May | 21.9 °C | -0.5 °C | 111 mm | +12 mm |
| Jun | 27.6 °C | +1.8 °C | 196 mm | +24 mm |
| Jul | 32.6 °C | +4.1 °C | 172 mm | -69 mm |
| Aug | 31.8 °C | +1.7 °C | 193 mm | +22 mm |
| Sep | 28.4 °C | +2.3 °C | 220 mm | +70 mm |
| Oct | 22.6 °C | +1.8 °C | 149 mm | +98 mm |
| Nov | 16.0 °C | +1.7 °C | 13 mm | -37 mm |
| Dec | 9.9 °C | +2.0 °C | 27 mm | -2 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 Muan?
Muan has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.9 °C and it receives 1,171 mm of precipitation per year.
What is the hottest day ever recorded in Muan?
The hottest day measured in Muan between 1940 and 2025 was 2 August 2018, reaching 37.3 °C.
What is the coldest day in Muan?
The coldest day measured in Muan between 1940 and 2025 was 9 January 2021, at -14.2 °C.
Does it snow in Muan?
Yes. Muan gets on average 12.2 cm of snow per year and has around 60 frost days.
Has the climate of Muan warmed?
Yes: Muan warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Muan?
The wettest day measured in Muan between 1940 and 2025 was 5 September 2007, with 158 mm of rain in 24 hours.
What was the windiest day in Muan?
The windiest day measured in Muan between 1940 and 2025 was 28 August 2012, with winds reaching 74.2 km/h.
What is the warmest month in Muan?
The warmest month in Muan is August (26.5 °C on average); the coldest is January (1.7 °C).
How much does it rain in Muan?
Muan receives on average 1,171 mm of precipitation per year, spread over about 104 rainy days.
Is it sunny in Muan?
Muan 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 Muan?
The heaviest 24-hour snowfall measured in Muan between 1940 and 2025 was 11 February 1994, with 12.3 cm.
Are there tropical nights in Muan?
Yes: Muan has on average 74 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Muan?
In Muan, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 22 July 1994, and the lowest was -18.9 °C on 9 January 2021.
Compare Muan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Muan