Ganghwa-gun climate — normals and trends
Ganghwa-gun (South Korea) has a hot-summer humid continental, dry winter climate (Dwa) under the Köppen-Geiger classification. Its mean annual temperature is 11.7 °C and it receives 1,179 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 (25.4 °C on average) and the coldest is January (-3.1 °C). Rainfall peaks in July.
Ganghwa-gun averages 100 frost days, 13 hot days (≥ 30 °C) and 95 rainy days per year.
Ganghwa-gun has warmed by +1.8 °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 109 to 91 per year over the period.
The hottest day of the period reached 36.5 °C (on 1 August 2018) and the coldest -22.1 °C (on 15 January 2001).
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
Ganghwa-gunIncheon
- coords
- 37.75°, 126.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.7°C
Average daily high
15.6°C
Average daily low
8.2°C
Annual rainfall
1,179mm
Sunshine / day
8.8h
Mean relative humidity
72%
Average peak wind
16.7km/h
Seasonal range
28.5°C
Frost days (< 0 °C)
100 d/yr
Hot days (≥ 30 °C)
13 d/yr
Rainy days (≥ 1 mm)
95 d/yr
Annual snowfall
18.6 cm
Average feels-like high
14.6 °C
Average feels-like low
6.4 °C
Average peak gust
32.5 km/h
Tropical nights (≥ 20 °C)
66 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.48 · 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
36.5 °C
1 August 2018
Coldest day
-22.1 °C
15 January 2001
Wettest day
185 mm
16 July 2006
Windiest day
65.0 km/h
7 September 2019
Strongest gust
120.2 km/h
28 August 2012
Hottest feels-like
43.0 °C
1 August 2018
Coldest feels-like
-28.6 °C
15 January 2001
Snowiest day
16.7 cm
8 March 1991
Sunniest day
14.3 h
22 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 | 3.0 °C | +2.1 °C | 18 mm | -1 mm |
| Feb | 2.7 °C | -0.6 °C | 5 mm | -18 mm |
| Mar | 11.1 °C | +2.4 °C | 43 mm | +3 mm |
| Apr | 16.0 °C | +0.7 °C | 95 mm | +20 mm |
| May | 20.1 °C | -0.6 °C | 82 mm | -10 mm |
| Jun | 25.9 °C | +1.3 °C | 153 mm | +27 mm |
| Jul | 30.0 °C | +2.8 °C | 161 mm | -145 mm |
| Aug | 30.5 °C | +2.0 °C | 178 mm | -60 mm |
| Sep | 26.7 °C | +1.9 °C | 206 mm | +71 mm |
| Oct | 19.7 °C | +0.9 °C | 169 mm | +118 mm |
| Nov | 13.2 °C | +2.1 °C | 14 mm | -33 mm |
| Dec | 4.5 °C | +0.8 °C | 39 mm | +13 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 Ganghwa-gun?
Ganghwa-gun has a hot-summer humid continental, dry winter climate (Köppen Dwa). Over 1940-2025, the average annual temperature is 11.7 °C and it receives 1,179 mm of precipitation per year.
What is the hottest day ever recorded in Ganghwa-gun?
The hottest day measured in Ganghwa-gun between 1940 and 2025 was 1 August 2018, reaching 36.5 °C.
What is the coldest day in Ganghwa-gun?
The coldest day measured in Ganghwa-gun between 1940 and 2025 was 15 January 2001, at -22.1 °C.
Does it snow in Ganghwa-gun?
Yes. Ganghwa-gun gets on average 18.6 cm of snow per year and has around 100 frost days.
Has the climate of Ganghwa-gun warmed?
Yes: Ganghwa-gun warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ganghwa-gun?
The wettest day measured in Ganghwa-gun between 1940 and 2025 was 16 July 2006, with 185 mm of rain in 24 hours.
What was the windiest day in Ganghwa-gun?
The windiest day measured in Ganghwa-gun between 1940 and 2025 was 7 September 2019, with winds reaching 65.0 km/h.
What is the warmest month in Ganghwa-gun?
The warmest month in Ganghwa-gun is August (25.4 °C on average); the coldest is January (-3.1 °C).
How much does it rain in Ganghwa-gun?
Ganghwa-gun receives on average 1,179 mm of precipitation per year, spread over about 95 rainy days.
Is it sunny in Ganghwa-gun?
Ganghwa-gun gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ganghwa-gun?
The heaviest 24-hour snowfall measured in Ganghwa-gun between 1940 and 2025 was 8 March 1991, with 16.7 cm.
Are there tropical nights in Ganghwa-gun?
Yes: Ganghwa-gun has on average 66 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ganghwa-gun?
In Ganghwa-gun, between 1940 and 2025, the highest apparent temperature reached 43.0 °C on 1 August 2018, and the lowest was -28.6 °C on 15 January 2001.
Compare Ganghwa-gun with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ganghwa-gun