Exposure Time for Vitamin D Synthesis / MED (Climatology):Sapporo
Exposure Time around Noon (min.)
January
February
March
MED 300 300 220 200 150 100 100 80 70
600 cm2 200 200 120 100 75 50 45 30 25
1200 cm2 90 90 60 50 40 25 22 15 12
April
May
June
MED 70 55 50 50 40 40 40 40 40
600 cm2 25 20 20 15 12 15 15 12 12
1200 cm2 12 10 9 7 6 7 7 6 6
July
August
September
MED 30 30 30 30 35 40 40 50 55
600 cm2 12 12 10 10 12 15 12 20 20
1200 cm2 6 6 5 5 6 7 6 9 10
October
November
December
MED 70 85 120 150 200 250 300 350 350
600 cm2 25 35 50 85 120 150 150 220 200
1200 cm2 12 15 25 40 60 70 80 120 100
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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).