Asan climate — normals and trends
Asan (South Korea) has a hot-summer humid continental, dry winter climate (Dwa) under the Köppen-Geiger classification. Its mean annual temperature is 12.3 °C and it receives 1,142 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 (25.8 °C on average) and the coldest is January (-2.2 °C). Rainfall peaks in July.
Asan averages 103 frost days, 35 hot days (≥ 30 °C) and 99 rainy days per year.
Asan has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 114 to 92 per year over the period.
The hottest day of the period reached 39.1 °C (on 15 August 2018) and the coldest -22.2 °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
AsanChungcheongnam-do
- coords
- 36.78°, 127.00°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.3°C
Average daily high
17.1°C
Average daily low
8.0°C
Annual rainfall
1,142mm
Sunshine / day
8.7h
Mean relative humidity
72%
Average peak wind
14.5km/h
Seasonal range
28.0°C
Frost days (< 0 °C)
103 d/yr
Hot days (≥ 30 °C)
35 d/yr
Rainy days (≥ 1 mm)
99 d/yr
Annual snowfall
20.8 cm
Average feels-like high
16.3 °C
Average feels-like low
6.6 °C
Average peak gust
34.4 km/h
Tropical nights (≥ 20 °C)
62 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.51 · 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
39.1 °C
15 August 2018
Coldest day
-22.2 °C
18 January 1945
Wettest day
199 mm
21 September 2024
Windiest day
50.8 km/h
28 August 2012
Strongest gust
120.6 km/h
28 August 2012
Hottest feels-like
44.4 °C
3 August 1959
Coldest feels-like
-28.0 °C
18 January 1945
Snowiest day
20.2 cm
5 March 2004
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 | +2.2 °C | 15 mm | -10 mm |
| Feb | 3.8 °C | -0.7 °C | 10 mm | -18 mm |
| Mar | 13.4 °C | +2.9 °C | 49 mm | +1 mm |
| Apr | 19.5 °C | +1.7 °C | 67 mm | -10 mm |
| May | 22.8 °C | -0.5 °C | 79 mm | -5 mm |
| Jun | 28.7 °C | +1.7 °C | 152 mm | +23 mm |
| Jul | 32.5 °C | +3.6 °C | 211 mm | -55 mm |
| Aug | 31.8 °C | +2.1 °C | 182 mm | -30 mm |
| Sep | 27.1 °C | +1.7 °C | 294 mm | +146 mm |
| Oct | 20.8 °C | +1.2 °C | 188 mm | +135 mm |
| Nov | 14.4 °C | +2.3 °C | 16 mm | -31 mm |
| Dec | 6.0 °C | +1.3 °C | 37 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 Asan?
Asan has a hot-summer humid continental, dry winter climate (Köppen Dwa). Over 1940-2025, the average annual temperature is 12.3 °C and it receives 1,142 mm of precipitation per year.
What is the hottest day ever recorded in Asan?
The hottest day measured in Asan between 1940 and 2025 was 15 August 2018, reaching 39.1 °C.
What is the coldest day in Asan?
The coldest day measured in Asan between 1940 and 2025 was 18 January 1945, at -22.2 °C.
Does it snow in Asan?
Yes. Asan gets on average 20.8 cm of snow per year and has around 103 frost days.
Has the climate of Asan warmed?
Yes: Asan warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Asan?
The wettest day measured in Asan between 1940 and 2025 was 21 September 2024, with 199 mm of rain in 24 hours.
What was the windiest day in Asan?
The windiest day measured in Asan between 1940 and 2025 was 28 August 2012, with winds reaching 50.8 km/h.
What is the warmest month in Asan?
The warmest month in Asan is August (25.8 °C on average); the coldest is January (-2.2 °C).
How much does it rain in Asan?
Asan receives on average 1,142 mm of precipitation per year, spread over about 99 rainy days.
Is it sunny in Asan?
Asan 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 Asan?
The heaviest 24-hour snowfall measured in Asan between 1940 and 2025 was 5 March 2004, with 20.2 cm.
Are there tropical nights in Asan?
Yes: Asan has on average 62 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Asan?
In Asan, between 1940 and 2025, the highest apparent temperature reached 44.4 °C on 3 August 1959, and the lowest was -28.0 °C on 18 January 1945.
Compare Asan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Asan