Sinan climate — normals and trends
Sinan (South Korea) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.7 °C and it receives 1,277 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 (24.8 °C on average) and the coldest is January (4.2 °C). Rainfall peaks in July.
Sinan averages 7 frost days, 0 hot days (≥ 30 °C) and 104 rainy days per year.
Sinan has warmed by +0.8 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.
The number of frost days there went from about 11 to 3 per year over the period.
The hottest day of the period reached 29.9 °C (on 13 August 1994) and the coldest -6.0 °C (on 25 January 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
SinanJeollanam-do
- coords
- 34.83°, 126.11°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.7°C
Average daily high
14.7°C
Average daily low
12.8°C
Annual rainfall
1,277mm
Sunshine / day
8.4h
Mean relative humidity
79%
Average peak wind
30.3km/h
Seasonal range
20.6°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
104 d/yr
Annual snowfall
21.2 cm
Average feels-like high
13.3 °C
Average feels-like low
9.5 °C
Average peak gust
41.4 km/h
Tropical nights (≥ 20 °C)
86 d/yr
Solar radiation
15.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.8 °C
since 1940
+0.1 °C per decade · r² = 0.18 · 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
29.9 °C
13 August 1994
Coldest day
-6.0 °C
25 January 1941
Wettest day
196 mm
3 September 1954
Windiest day
109.9 km/h
28 August 2012
Strongest gust
167.8 km/h
28 August 2012
Hottest feels-like
37.5 °C
3 August 2024
Coldest feels-like
-16.6 °C
24 January 2016
Snowiest day
10.8 cm
16 January 1959
Sunniest day
13.9 h
20 June 1948
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 | 6.3 °C | +0.7 °C | 34 mm | -12 mm |
| Feb | 4.5 °C | -1.1 °C | 56 mm | +6 mm |
| Mar | 8.3 °C | +0.6 °C | 53 mm | -17 mm |
| Apr | 11.8 °C | +0.5 °C | 61 mm | -38 mm |
| May | 15.5 °C | +0.3 °C | 128 mm | +16 mm |
| Jun | 20.0 °C | +0.9 °C | 221 mm | +37 mm |
| Jul | 25.5 °C | +2.3 °C | 197 mm | -37 mm |
| Aug | 26.7 °C | +1.2 °C | 188 mm | +34 mm |
| Sep | 25.1 °C | +2.1 °C | 219 mm | +62 mm |
| Oct | 20.4 °C | +1.9 °C | 162 mm | +102 mm |
| Nov | 14.7 °C | +1.2 °C | 19 mm | -44 mm |
| Dec | 9.8 °C | +1.3 °C | 35 mm | -12 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 Sinan?
Sinan has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.7 °C and it receives 1,277 mm of precipitation per year.
What is the hottest day ever recorded in Sinan?
The hottest day measured in Sinan between 1940 and 2025 was 13 August 1994, reaching 29.9 °C.
What is the coldest day in Sinan?
The coldest day measured in Sinan between 1940 and 2025 was 25 January 1941, at -6.0 °C.
Does it snow in Sinan?
Yes. Sinan gets on average 21.2 cm of snow per year and has around 7 frost days.
Has the climate of Sinan warmed?
Yes: Sinan warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sinan?
The wettest day measured in Sinan between 1940 and 2025 was 3 September 1954, with 196 mm of rain in 24 hours.
What was the windiest day in Sinan?
The windiest day measured in Sinan between 1940 and 2025 was 28 August 2012, with winds reaching 109.9 km/h.
What is the warmest month in Sinan?
The warmest month in Sinan is August (24.8 °C on average); the coldest is January (4.2 °C).
How much does it rain in Sinan?
Sinan receives on average 1,277 mm of precipitation per year, spread over about 104 rainy days.
Is it sunny in Sinan?
Sinan gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sinan?
The heaviest 24-hour snowfall measured in Sinan between 1940 and 2025 was 16 January 1959, with 10.8 cm.
Are there tropical nights in Sinan?
Yes: Sinan has on average 86 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sinan?
In Sinan, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 3 August 2024, and the lowest was -16.6 °C on 24 January 2016.
Compare Sinan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sinan