Average annual temperature is 12.5 °C
Absolute maximum temperature: 32.7 °C
Absolute minimum temperature: -16.8 °C
Number of sunny days: 174 days
Number of rainy days: 181 days
Number of snow days: 10 days
Look at detailed online map of Geosan
* Weather data for Geosan 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) | 14.2 | 12.2 | 20.6 | 24.2 | 27.9 | 29.6 | 32.7 | 32.4 | 27.5 | 20.8 | 23.0 | 16.2 |
| Average daytime temperature (°C) | 3.0 | 6.7 | 14.0 | 16.2 | 20.0 | 24.9 | 27.4 | 28.1 | 23.9 | 18.2 | 10.9 | 5.3 |
| Average temperature (°C) | -1.0 | 2.0 | 8.8 | 11.5 | 15.9 | 20.6 | 24.1 | 24.6 | 20.9 | 14.1 | 6.7 | 1.6 |
| Average night temperature (°C) | -4.6 | -1.5 | 4.7 | 7.5 | 12.5 | 17.3 | 21.6 | 22.0 | 18.2 | 10.9 | 2.7 | -1.4 |
| Absolute minimum temperature (°C) | -16.8 | -7.7 | -4.6 | 0.1 | 5.3 | 14.0 | 17.0 | 20.1 | 13.9 | 4.6 | -8.0 | -13.5 |
| 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) | 7.8 | 7.5 | 9.1 | 8.5 | 7.8 | 8.9 | 7.5 | 8.7 | 7.2 | 8.6 | 7.8 | 6.9 |
| Precipitation (mm) | 40 | 38 | 65 | 83 | 182 | 177 | 288 | 303 | 251 | 11 | 52 | 129 |
| Sunny days | 22 | 18 | 20 | 15 | 14 | 11 | 3 | 2 | 4 | 22 | 23 | 20 |
| Rainy days | 4 | 8 | 11 | 15 | 17 | 19 | 28 | 29 | 26 | 9 | 6 | 9 |
| Snow days | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The largest precipitation sum in Geosan is at