Exposure Time for Vitamin D Synthesis / MED (Climatology):Sendai
Exposure Time around Noon (min.)
January
February
March
MED 150 120 120 100 80 70 50 60 50
600 cm2 70 65 55 40 30 25 20 20 15
1200 cm2 35 32 30 20 15 12 9 10 8
April
May
June
MED 40 35 30 30 30 30 30 30 30
600 cm2 15 12 10 10 10 10 10 10 10
1200 cm2 7 6 5 5 5 5 5 5 5
July
August
September
MED 30 30 25 25 25 30 40 30 40
600 cm2 10 10 8 8 9 10 15 10 12
1200 cm2 5 5 4 4 5 5 8 5 6
October
November
December
MED 60 55 60 75 90 100 150 150 150
600 cm2 20 20 20 30 40 50 70 70 70
1200 cm2 10 10 10 15 20 25 35 35 35
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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.
In case no data are available, '--' is put in the matrix.
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).