Vitamin D from sunlight in Turkey
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 Turkey.
| City | Latitude | Elevation | Vitamin D winter |
|---|---|---|---|
| Istanbul | 41.01°N | 39 m | 30 Oct – 19 Feb (113 days) |
| Ankara | 39.92°N | 850 m | 6 Nov – 11 Feb (98 days) |
| Bursa | 40.20°N | 155 m | 2 Nov – 15 Feb (106 days) |
| İzmir | 38.41°N | 122 m | 9 Nov – 8 Feb (92 days) |
| Gaziantep | 37.06°N | 842 m | 19 Nov – 29 Jan (72 days) |
| Diyarbakır | 37.91°N | 674 m | 15 Nov – 2 Feb (80 days) |
| Adana | 36.99°N | 30 m | 16 Nov – 31 Jan (77 days) |
| Kayseri | 38.73°N | 1,054 m | 12 Nov – 5 Feb (86 days) |
The same sun that makes vitamin D also burns. UV index and sunburn times in Turkey →