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Exposure Time for Vitamin D Synthesis / MED (Climatology):Hateruma

Exposure Time around Noon (min.)

January February March early middle late early middle late early middle late MED 60 60 55 52 40 40 40 35 32 600 cm2 22 22 20 19 14 14 14 12 11 1200 cm2 11 11 10 9 7 7 7 6 6

April May June early middle late early middle late early middle late MED 30 30 30 30 27 26 25 25 20 600 cm2 10 10 10 10 9 9 8 8 7 1200 cm2 5 5 5 5 4 4 4 4 3

July August September early middle late early middle late early middle late MED 20 20 22 23 22 21 24 24 25 600 cm2 7 7 7 8 7 7 8 8 8 1200 cm2 3 3 4 4 4 4 4 4 4

October November December early middle late early middle late early middle late MED 28 31 38 40 45 52 60 62 70 600 cm2 9 11 13 15 17 20 24 24 27 1200 cm2 5 5 6 7 8 10 12 12 14

The numerical values in the row of 'MED', '600 cm²' and '1200 cm²' show the mean time to reach MED (Minimal Erythema Dose), the time required for 10 µg Vitamin D to be produced for a skin area of 600 cm², and 1200 cm² exposed to solar radiation in minutes, respectively.
By clicking each 10 day period, you can also see a diurnal variation of exposure time for that period.

Appropriate exposure time at every site shown below can be seen.
Cape Ochi-ishi (Hokkaido), Rikubetsu (Hokkaido), Sapporo (Hokkaido), Aomori (Aomori), Sendai (Miyagi), Tsukuba (Ibaraki), Yokohama (Kanagawa), Nagoya (Aichi), Otsu (Shiga), Osaka (Osaka), Miyazaki (Miyazaki), Cape Hedo (Okinawa), Hateruma (Okinawa).

Position of Hateruma