Sun during winter months can be very deceiving. Don't let the cold weather fool you.
Many people think they only need to wear sunglasses in the summer. Actually, during winter months, snow reflects up to 80% of UV radiation, according to the World Health Organization. By comparison, grass, soil, and water reflect less than 10%, while dry beach sand reflects up to 15%.
One category of invisible high-energy UV rays are called UVA, which represent the longer sun rays. This means they reach earth no matter how the tilt is. UVA are constantly covering every spot on which sun light reaches. If there's sun light there's UVA. The UVA doesn't get weaker during winter months, and the sun light doesn't get weaker during winter.
UVA rays can be dangerous because they can pass through the cornea and reach the lens and retina inside the eye. UVA is at the same level in June as it is in December. It is the same level at the Sahara and NYC.
Overexposure to UVA radiation has been linked to the development of certain types of cataracts, and research suggests UVA rays may play a role in development of macular degeneration.
So...again, what's your winter plan?