Average annual temperature is 10.3 °C
Absolute maximum temperature: 31.4 °C
Absolute minimum temperature: -19.9 °C
Number of sunny days: 190 days
Number of rainy days: 162 days
Number of snow days: 13 days
Look at detailed online map of Irwŏl-myŏn
* Weather data for Irwŏl-myŏn 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) | 11.1 | 10.4 | 18.3 | 21.4 | 26.9 | 28.4 | 30.8 | 31.4 | 25.3 | 19.4 | 20.3 | 12.5 |
| Average daytime temperature (°C) | 0.2 | 4.4 | 12.0 | 14.0 | 19.2 | 23.6 | 26.0 | 26.6 | 22.2 | 16.0 | 8.2 | 2.3 |
| Average temperature (°C) | -3.6 | -0.3 | 6.4 | 9.1 | 14.6 | 19.0 | 22.4 | 23.0 | 18.7 | 11.3 | 3.9 | -1.5 |
| Average night temperature (°C) | -7.2 | -3.6 | 1.6 | 4.7 | 10.6 | 15.3 | 19.7 | 20.1 | 15.9 | 7.5 | -0.1 | -4.5 |
| Absolute minimum temperature (°C) | -19.9 | -8.7 | -7.5 | -2.3 | 3.4 | 11.8 | 15.5 | 16.8 | 11.1 | 0.9 | -10.4 | -16.0 |
| 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) | 7.5 | 7.6 | 8.9 | 8.6 | 8.9 | 9.7 | 7.8 | 9.2 | 7.3 | 8.7 | 7.7 | 6.8 |
| Precipitation (mm) | 30 | 17 | 50 | 79 | 153 | 213 | 385 | 254 | 215 | 16 | 43 | 112 |
| Sunny days | 25 | 18 | 24 | 16 | 18 | 7 | 4 | 7 | 9 | 20 | 19 | 23 |
| Rainy days | 3 | 3 | 7 | 14 | 13 | 23 | 27 | 24 | 21 | 11 | 9 | 7 |
| Snow days | 3 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 |
The largest precipitation sum in Irwŏl-myŏn is at