Average annual temperature is 13.0 °C
Absolute maximum temperature: 34.3 °C
Absolute minimum temperature: -13.1 °C
Number of sunny days: 181 days
Number of rainy days: 170 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) | 13.2 | 10.3 | 24.6 | 26.5 | 28.8 | 34.0 | 32.3 | 34.3 | 30.8 | 22.8 | 22.1 | 16.2 |
| Average daytime temperature (°C) | 3.0 | 5.7 | 13.2 | 17.5 | 22.9 | 26.2 | 28.5 | 29.6 | 26.2 | 19.4 | 11.0 | 5.5 |
| Average temperature (°C) | -1.2 | 1.0 | 7.4 | 12.1 | 17.5 | 21.4 | 25.2 | 25.7 | 22.2 | 15.0 | 7.2 | 1.8 |
| Average night temperature (°C) | -5.1 | -2.4 | 2.8 | 7.9 | 13.2 | 17.7 | 22.6 | 22.4 | 18.9 | 10.9 | 3.4 | -1.8 |
| Absolute minimum temperature (°C) | -13.1 | -7.0 | -2.6 | 2.1 | 5.4 | 14.3 | 19.8 | 17.7 | 14.0 | 5.6 | -3.9 | -10.7 |
| 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 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.8 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.2 | 8.3 | 9.3 | 8.1 | 8.5 | 9.7 | 7.8 | 9.0 | 7.4 | 8.3 | 6.7 | 4.4 |
| Precipitation (mm) | 27 | 2 | 10 | 91 | 121 | 208 | 483 | 225 | 194 | 22 | 88 | 81 |
| Sunny days | 19 | 25 | 24 | 17 | 19 | 11 | 5 | 6 | 8 | 20 | 12 | 15 |
| Rainy days | 7 | 2 | 7 | 13 | 12 | 19 | 26 | 25 | 22 | 11 | 17 | 9 |
| Snow days | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 7 |
The largest precipitation sum in Seosan is at