Information on Vitamin D Synthesis / Erythemal UV | Center for Global Environmental Studies

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

Exposure Time around Noon (min.)

	January			February			March
	early	middle	late	early	middle	late	early	middle	late
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
	early	middle	late	early	middle	late	early	middle	late
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
	early	middle	late	early	middle	late	early	middle	late
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
	early	middle	late	early	middle	late	early	middle	late
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

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).

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

Position of Sapporo