Cold weather is no reason to ease up on your sunscreen routine, according to the Skin Cancer Foundation. UVB rays, which are the primary cause of sunburn, are weaker in the winter. However, UVA rays, which contribute to premature skin aging, remain steady year- round and can penetrate clouds, fog and windows.
On a snowy day, UVA rays can be worse: Snow reflects up to 80 percent of UV light, so the rays hit you twice.

The best protection is an even coat of broad-spectrum sunscreen over all exposed skin, even the tops of your ears and around your hairline. A moisturizing sunscreen can do double duty, protecting you from the sun and harsh winter air.
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