Vitamin D sun calendar

Your skin makes vitamin D with the sun's UV light. This calendar shows how much of that UV light reaches the ground in each month, measured by satellite. Choose a place and compare the months.

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    Each bar shows the average daily UV dose for vitamin D, compared with the strongest month (100%).

    Show as a table

    Since 1 January 2026 the cloud data comes from new satellites (MTG). The values for 2026 may therefore differ slightly from earlier years.

    How to read this

    The bars do not show how much vitamin D you make. That depends on your skin, how much skin is uncovered, the time of day and how long you are outside. They show how much of this UV light reaches the ground, compared with the strongest month.

    Official recommendation

    These amounts come from the health authority named below.

    • For adults, the Panel sets an AI for vitamin D at 15 μg/day.

    EFSA Panel on Dietetic Products, Nutrition and Allergies, Dietary reference values for vitamin D (2016)

    For journalists and bloggers

    You may use the data and the chart freely. Please credit the source as NOTFORTOMORROW, based on TEMIS (KNMI / ESA), with a link to this page.

    Our vitamin D3 + K2 drops

    NOTFORTOMORROW Vitamin D3 + K2 drops in an amber glass bottle with dropper and yellow label, 5000 IU MK-7, 20 ml

    Vitamin D3 + K2 Drops 5000 IU (MK-7)

    €24,95

    Vitamin D3 (5000 IU / 125 µg) paired with active vitamin K2 as MK-7, in an MCT-oil drop for easy, precise dosing. Vitamin D contributes to the normal function of the immune system, to the normal absorption and use of calcium, and to the maintenance of normal bones, while vitamin K contributes to the maintenance of normal bones and to normal blood clotting. Free from gluten, lactose, alcohol, artificial colours and preservatives.

    Food supplement. Do not exceed the recommended daily intake. A food supplement is not a substitute for a varied, balanced diet and a healthy lifestyle. Keep out of reach of young children. Not intended for pregnant or breastfeeding women. If you take anticoagulants (blood thinners), consult your physician before use. Store cool and dry. Use within 6 months after opening.

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