Average annual temperature is 10.8 °C
Absolute maximum temperature: 31.5 °C
Absolute minimum temperature: -21.0 °C
Number of sunny days: 173 days
Number of rainy days: 168 days
Number of snow days: 24 days
Look at detailed online map of Semirŏn
* Weather data for Semirŏn 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) | 11.7 | 11.1 | 19.8 | 20.8 | 27.5 | 29.7 | 31.4 | 31.5 | 27.9 | 19.3 | 21.4 | 14.0 |
| Average daytime temperature (°C) | -0.1 | 5.0 | 12.6 | 15.2 | 20.2 | 24.4 | 26.9 | 27.9 | 23.9 | 16.4 | 8.2 | 2.1 |
| Average temperature (°C) | -4.1 | -0.2 | 6.9 | 9.8 | 15.6 | 19.7 | 23.2 | 23.9 | 19.8 | 11.9 | 3.7 | -1.5 |
| Average night temperature (°C) | -8.1 | -3.9 | 1.4 | 4.7 | 10.8 | 15.8 | 20.2 | 20.8 | 16.5 | 7.9 | -0.5 | -4.7 |
| Absolute minimum temperature (°C) | -21.0 | -9.7 | -7.4 | -3.0 | 3.2 | 11.8 | 16.3 | 14.8 | 11.5 | 1.4 | -10.9 | -17.1 |
| 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) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.7 | 14.4 | 13.6 | 12.4 | 11.2 | 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) | 7.1 | 7.8 | 9.4 | 8.4 | 9.1 | 10.1 | 7.5 | 9.1 | 7.5 | 8.5 | 7.5 | 6.0 |
| Precipitation (mm) | 33 | 7 | 29 | 97 | 118 | 209 | 483 | 297 | 235 | 24 | 75 | 90 |
| Sunny days | 18 | 21 | 21 | 13 | 16 | 7 | 7 | 9 | 8 | 20 | 16 | 17 |
| Rainy days | 4 | 0 | 10 | 17 | 15 | 23 | 24 | 22 | 22 | 11 | 12 | 8 |
| Snow days | 9 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 6 |
The largest precipitation sum in Semirŏn is at