Average annual temperature is 14.4 °C
Absolute maximum temperature: 36.0 °C
Absolute minimum temperature: -13.6 °C
Number of sunny days: 154 days
Number of rainy days: 197 days
Number of snow days: 14 days
Look at detailed online map of Seosan
* Weather data for Seosan South Korea is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 16.2 | 12.7 | 24.5 | 25.8 | 32.3 | 36.0 | 32.9 | 34.2 | 31.3 | 22.9 | 24.9 | 18.7 |
| Average daytime temperature (°C) | 4.8 | 7.8 | 16.5 | 19.3 | 24.3 | 28.4 | 29.5 | 30.5 | 26.9 | 20.3 | 12.9 | 7.5 |
| Average temperature (°C) | 0.4 | 2.4 | 9.7 | 13.5 | 18.9 | 22.9 | 26.1 | 26.6 | 22.9 | 15.8 | 8.7 | 4.2 |
| Average night temperature (°C) | -4.1 | -1.7 | 4.7 | 8.7 | 14.5 | 18.8 | 23.5 | 23.4 | 19.5 | 11.8 | 4.4 | 1.1 |
| Absolute minimum temperature (°C) | -13.6 | -5.9 | -2.3 | 1.3 | 6.1 | 14.1 | 21.0 | 16.8 | 14.2 | 6.7 | -3.5 | -9.8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.2 | 7.3 | 8.8 | 7.6 | 8.0 | 9.2 | 6.8 | 9.6 | 7.8 | 8.6 | 6.5 | 5.3 |
| Precipitation (mm) | 34 | 12 | 32 | 74 | 129 | 128 | 501 | 257 | 198 | 16 | 98 | 118 |
| Sunny days | 17 | 19 | 22 | 12 | 12 | 13 | 0 | 4 | 9 | 20 | 13 | 13 |
| Rainy days | 9 | 9 | 9 | 18 | 19 | 17 | 31 | 27 | 21 | 11 | 16 | 10 |
| Snow days | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
The largest precipitation sum in Seosan is at