Hot Sunny Days - Keep Your Skin Safe.

On a cloudy day 30 to 50 per cent of the sun's UV rays reach your skin, so it's still possible to burn.

You may not feel the sun's rays if it's windy, but they still cause damage.

Brief intensive sunbathing is harmful, eg all day in the sun for one week. It may contribute to skin cancer developing.

On hot days use a hat and cover up arms and legs with loose-fitting clothes.

Vitamin D is essential for good bone health, and up to 90 per cent of our requirements are probably gained through the effects of sunlight. The complete facts and figures about how much is needed to prevent severe diseases, such as rickets, is not absolutely clear. But the current advice is that 10 to 15 minutes exposure to the summer sun 2 to 3 times a week should be sufficient to keep us healthy without taking any risks.

: http://www.netdoctor.co.uk/health_advice/facts/sunbathing.htm#ixzz357Ew7BLr