Average annual temperature is 11.6 °C
Absolute maximum temperature: 33.0 °C
Absolute minimum temperature: -20.1 °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 Haesan
* Weather data for Haesan 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) | 9.5 | 11.3 | 21.2 | 23.4 | 27.9 | 32.7 | 32.6 | 33.0 | 29.5 | 21.4 | 22.0 | 13.8 |
| Average daytime temperature (°C) | 0.3 | 5.4 | 13.5 | 16.2 | 21.9 | 25.9 | 29.2 | 28.8 | 25.4 | 18.1 | 8.2 | 2.3 |
| Average temperature (°C) | -3.7 | 0.3 | 7.2 | 10.9 | 16.7 | 21.0 | 25.0 | 24.7 | 20.9 | 12.8 | 3.7 | -1.6 |
| Average night temperature (°C) | -8.1 | -3.0 | 1.9 | 5.9 | 11.8 | 16.5 | 21.7 | 21.3 | 17.4 | 8.7 | -0.1 | -4.9 |
| Absolute minimum temperature (°C) | -20.1 | -6.9 | -5.9 | -0.8 | 3.7 | 12.9 | 18.1 | 17.1 | 10.1 | 2.5 | -9.3 | -17.4 |
| 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 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| 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) | 6.9 | 8.3 | 9.5 | 7.4 | 9.4 | 9.9 | 8.4 | 7.9 | 7.8 | 8.2 | 6.6 | 5.8 |
| Precipitation (mm) | 44 | 2 | 18 | 87 | 110 | 201 | 246 | 247 | 92 | 19 | 84 | 79 |
| Sunny days | 19 | 25 | 23 | 12 | 19 | 7 | 8 | 5 | 11 | 19 | 16 | 17 |
| Rainy days | 6 | 0 | 8 | 18 | 12 | 23 | 23 | 26 | 19 | 12 | 13 | 10 |
| Snow days | 6 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
The largest precipitation sum in Haesan is at