howmuchsun

Vitamin D from sunlight in Morocco

How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 6 cities in Morocco.

CityLatitudeElevationVitamin D winter
Casablanca 33.59°N 27 m 11 Dec – 5 Jan (26 days)
Rabat 34.01°N 46 m 7 Dec – 10 Jan (35 days)
Fes 34.03°N 406 m 8 Dec – 8 Jan (32 days)
Tangier 35.77°N 20 m 24 Nov – 23 Jan (61 days)
Marrakesh 31.63°N 457 m none
Agadir 30.42°N 31 m none

How these dates are calculated