Exposure Time for Vitamin D Synthesis / MED (Climatology):Osaka
Exposure Time around Noon (min.)
January
February
March
MED 150 130 130 110 100 80 70 50 50
600 cm2 70 60 60 50 40 30 30 20 20
1200 cm2 35 30 30 25 20 15 15 10 10
April
May
June
MED 40 40 40 35 40 32 30 40 30
600 cm2 15 15 13 12 13 12 10 13 11
1200 cm2 8 8 7 6 7 6 6 7 6
July
August
September
MED 35 32 30 25 35 32 35 40 50
600 cm2 12 11 10 9 12 12 13 15 18
1200 cm2 6 6 5 5 6 6 6 7 8
October
November
December
MED 50 50 70 70 90 100 120 130 130
600 cm2 20 20 25 30 40 50 50 55 60
1200 cm2 10 10 12 15 20 23 25 30 30
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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).