Vitamin D from sunlight in France
How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 5 cities in France.
| City | Latitude | Elevation | Vitamin D winter |
|---|---|---|---|
| Paris | 48.85°N | 42 m | 3 Oct – 20 Mar (169 days) |
| Lille | 50.63°N | 20 m | 27 Sep – 26 Mar (181 days) |
| Roubaix | 50.69°N | 33 m | 27 Sep – 27 Mar (182 days) |
| Tourcoing | 50.72°N | 49 m | 26 Sep – 27 Mar (183 days) |
| Dunkirk | 51.03°N | 8 m | 25 Sep – 28 Mar (185 days) |
The same sun that makes vitamin D also burns. UV index and sunburn times in France →