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Exposure Time for Vitamin D Synthesis / MED (Climatology):Cape Ochi-ishi

Exposure Time around Noon (min.)

January February March early middle late early middle late early middle late MED 230 220 200 150 120 100 100 80 70 600 cm2 130 120 100 70 60 40 40 30 25 1200 cm2 70 60 50 35 30 20 20 15 12

April May June early middle late early middle late early middle late MED 65 55 50 50 45 45 40 40 40 600 cm2 24 20 15 20 15 15 15 15 15 1200 cm2 12 10 8 9 8 8 7 7 7

July August September early middle late early middle late early middle late MED 40 40 40 40 40 40 45 50 55 600 cm2 15 15 15 15 15 15 15 20 20 1200 cm2 7 7 7 7 7 7 8 9 10

October November December early middle late early middle late early middle late MED 70 90 100 150 180 200 230 250 250 600 cm2 30 40 40 65 90 100 140 150 150 1200 cm2 15 20 20 30 40 55 70 75 75

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 Cape Ochi-ishi