UV Index in Winter

Many people put their sunscreen away as soon as the temperature drops. However, the UV Index isn't about heat; it's about radiation. In winter, certain conditions can make UV exposure just as dangerous as in summer.

The Snow Reflection Effect

Fresh snow reflects up to 80% of UV radiation. This means you're getting hit twice: once from the sun and once from the ground. This is why "snow blindness" and facial sunburns are so common among skiers and hikers.

Altitude Matters

For every 1,000 meters of altitude gain, UV levels increase by about 10% to 12%. On a mountain peak, the air is thinner and filters less radiation, making your Sun Day alerts even more critical.

Vitamin D vs. Skin Damage

In winter, it's harder to get enough Vitamin D, but you still need to protect your face and eyes. Sun Day helps you find the perfect balance: telling you when to get exposure and when the reflection makes it dangerous.