Vitamin D from sunlight in Portugal
How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 3 cities in Portugal.
| City | Latitude | Elevation | Vitamin D winter |
|---|---|---|---|
| Lisbon | 38.73°N | 68 m | 11 Nov – 6 Feb (88 days) |
| Porto | 41.15°N | 91 m | 2 Nov – 16 Feb (107 days) |
| Braga | 41.55°N | 190 m | 31 Oct – 17 Feb (110 days) |
The same sun that makes vitamin D also burns. UV index and sunburn times in Portugal →