Average annual temperature is 9.8 °C
Absolute maximum temperature: 31.9 °C
Absolute minimum temperature: -22.2 °C
Number of sunny days: 163 days
Number of rainy days: 179 days
Number of snow days: 23 days
Look at detailed online map of Ilsongchŏng
* Weather data for Ilsongchŏng 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) | 9.8 | 10.9 | 20.2 | 23.3 | 26.1 | 29.3 | 31.9 | 31.8 | 28.2 | 19.1 | 19.8 | 12.1 |
| Average daytime temperature (°C) | -1.4 | 3.8 | 11.7 | 14.3 | 19.9 | 23.8 | 27.6 | 27.5 | 23.4 | 16.0 | 7.2 | 0.7 |
| Average temperature (°C) | -6.4 | -1.3 | 5.5 | 8.7 | 14.9 | 19.1 | 23.4 | 23.1 | 19.1 | 10.9 | 2.6 | -3.1 |
| Average night temperature (°C) | -11.3 | -4.9 | 0.5 | 4.0 | 10.1 | 14.8 | 20.1 | 19.7 | 15.7 | 6.5 | -1.3 | -6.5 |
| Absolute minimum temperature (°C) | -22.2 | -10.2 | -8.6 | -3.7 | 2.8 | 10.9 | 17.1 | 13.8 | 8.2 | 0.1 | -11.4 | -18.9 |
| 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 | 14.7 | 14.5 | 13.6 | 12.4 | 11.2 | 10.2 | 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 | 7.9 | 9.1 | 7.7 | 9.4 | 9.9 | 8.2 | 8.8 | 7.5 | 8.4 | 6.8 | 5.7 |
| Precipitation (mm) | 46 | 3 | 26 | 122 | 121 | 205 | 354 | 306 | 157 | 23 | 98 | 99 |
| Sunny days | 18 | 21 | 20 | 13 | 18 | 6 | 3 | 6 | 9 | 17 | 16 | 16 |
| Rainy days | 3 | 1 | 10 | 17 | 13 | 24 | 28 | 25 | 21 | 14 | 13 | 10 |
| Snow days | 10 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 |
The largest precipitation sum in Ilsongchŏng is at