Vitamin D from sunlight in South Korea
How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 8 cities in South Korea.
| City | Latitude | Elevation | Vitamin D winter |
|---|---|---|---|
| Seoul | 37.57°N | 38 m | 12 Nov – 6 Feb (87 days) |
| Busan | 35.10°N | 15 m | 24 Nov – 24 Jan (62 days) |
| Incheon | 37.46°N | 43 m | 12 Nov – 5 Feb (86 days) |
| Daegu | 35.87°N | 45 m | 20 Nov – 28 Jan (70 days) |
| Daejeon | 36.35°N | 58 m | 17 Nov – 31 Jan (76 days) |
| Gwangju | 35.15°N | 47 m | 24 Nov – 24 Jan (62 days) |
| Suwon | 37.29°N | 58 m | 13 Nov – 4 Feb (84 days) |
| Ulsan | 35.54°N | 10 m | 21 Nov – 26 Jan (67 days) |
The same sun that makes vitamin D also burns. UV index and sunburn times in South Korea →