Ganghwa-gun, South Korea Climate
The warmest month is August, with an average high of 26°C; the coldest is January, with an average low of -2°C. A normal year brings 1172 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 26
- Normal high
- 22°C
- Normal low
- 18°C
- Reanalysis high
- 25°Cin 2016
- Reanalysis low
- 14°Cin 1992
- Chance of a wet day
- 31%
- Daylight
- 12 h 01 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 2°C | -2°C | 10°C (2002) | -13°C (2018) | 22 mm | 6.2 |
| February | 3°C | -1°C | 10°C (2010) | -14°C (2013) | 31 mm | 5.7 |
| March | 7°C | 2°C | 15°C (2003) | -5°C (2007) | 40 mm | 6.2 |
| April | 12°C | 7°C | 20°C (2016) | 1°C (1995) | 66 mm | 6.0 |
| May | 17°C | 12°C | 24°C (2016) | 7°C (2010) | 93 mm | 9.3 |
| June | 21°C | 18°C | 28°C (2012) | 12°C (2010) | 111 mm | 9.0 |
| July | 25°C | 22°C | 32°C (1994) | 17°C (1996) | 291 mm | 18.6 |
| August | 26°C | 23°C | 32°C (2018) | 18°C (2009) | 257 mm | 18.6 |
| September | 23°C | 20°C | 28°C (1998) | 13°C (1993) | 126 mm | 9.0 |
| October | 18°C | 14°C | 25°C (2019) | 3°C (1997) | 56 mm | 6.2 |
| November | 11°C | 7°C | 19°C (2011) | -3°C (1992) | 51 mm | 9.0 |
| December | 4°C | 0°C | 13°C (1994) | -10°C (2012) | 28 mm | 6.2 |
| Year | 14°C | 10°C | 1172 mm | 110 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
1172 mm in a normal year, most in July.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Ganghwa-gun.
The muggiest month is August, when 97 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | -5°C | 73% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | -4°C | 72% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | 0°C | 76% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 6°C | 80% | 99% | 1% | 0% | 0% | 0% | 0% |
| May | 11°C | 82% | 77% | 22% | 1% | 0% | 0% | 0% |
| June | 16°C | 84% | 5% | 29% | 47% | 19% | 0% | 0% |
| July | 21°C | 89% | 0% | 0% | 7% | 43% | 46% | 3% |
| August | 22°C | 85% | 0% | 1% | 3% | 28% | 51% | 18% |
| September | 17°C | 77% | 8% | 21% | 35% | 29% | 7% | 1% |
| October | 11°C | 71% | 72% | 19% | 8% | 1% | 0% | 0% |
| November | 4°C | 73% | 97% | 2% | 0% | 0% | 0% | 0% |
| December | -2°C | 74% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is October, with the sky 46 percent covered on average; the cloudiest is July, at 75 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is December, averaging 21.6 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 18, with 14 h 47 min of daylight; the shortest is Dec 18, with 9 h 33 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Ganghwa-gun in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.