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

Exposure Time around Noon (min.)

January February March early middle late early middle late early middle late MED 100 100 90 80 70 65 60 55 50 600 cm2 50 50 40 35 25 25 24 20 20 1200 cm2 25 25 20 18 13 12 12 10 9

April May June early middle late early middle late early middle late MED 45 40 35 35 35 32 32 32 35 600 cm2 15 15 13 12 12 11 11 11 13 1200 cm2 8 8 6 6 6 6 6 6 7

July August September early middle late early middle late early middle late MED 35 30 30 25 30 33 40 40 45 600 cm2 13 9 10 9 10 12 14 15 15 1200 cm2 6 5 5 5 5 6 7 8 8

October November December early middle late early middle late early middle late MED 50 70 60 75 90 110 120 120 120 600 cm2 20 25 24 30 35 50 50 50 50 1200 cm2 9 13 12 15 18 25 25 25 25

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 Tsukuba