Average annual temperature is 14.9 °C
Absolute maximum temperature: 36.7 °C
Absolute minimum temperature: -11.9 °C
Number of sunny days: 200 days
Number of rainy days: 161 days
Number of snow days: 4 days
Look at detailed online map of Ŏyŏn
* Weather data for Ŏyŏn 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) | 16.7 | 15.8 | 24.7 | 29.1 | 32.2 | 34.9 | 35.4 | 36.7 | 30.8 | 24.5 | 27.3 | 19.7 |
| Average daytime temperature (°C) | 7.2 | 10.6 | 18.2 | 20.1 | 24.0 | 29.2 | 30.2 | 31.5 | 27.4 | 22.0 | 15.1 | 9.3 |
| Average temperature (°C) | 1.2 | 4.3 | 11.1 | 14.0 | 18.5 | 23.4 | 26.0 | 27.3 | 23.3 | 15.8 | 9.1 | 4.1 |
| Average night temperature (°C) | -3.4 | -0.7 | 5.3 | 8.7 | 14.1 | 19.1 | 23.0 | 23.9 | 19.7 | 10.6 | 4.1 | -0.1 |
| Absolute minimum temperature (°C) | -11.9 | -5.1 | -4.3 | 2.1 | 7.4 | 15.3 | 19.2 | 21.6 | 15.0 | 5.1 | -4.0 | -7.6 |
| 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 | 7.6 | 8.7 | 7.9 | 7.7 | 9.0 | 7.2 | 9.5 | 7.6 | 8.5 | 8.2 | 6.9 |
| Precipitation (mm) | 39 | 30 | 72 | 72 | 206 | 179 | 271 | 346 | 259 | 8 | 57 | 72 |
| Sunny days | 26 | 20 | 21 | 16 | 15 | 13 | 4 | 5 | 10 | 24 | 23 | 23 |
| Rainy days | 4 | 8 | 10 | 14 | 16 | 17 | 27 | 26 | 20 | 7 | 6 | 6 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The largest precipitation sum in Ŏyŏn is at