Winter Sun and Snow Glare: Protecting Eyes and Skin
By Trailbound Editors · Published · Photo: Wikimedia Commons
Table of Contents
Quick Verdict
Snow reflects most of the ultraviolet that hits it, so a winter day can deliver roughly twice the UV of a summer one. Wear category 3 or 4 sunglasses with side coverage, use high-factor sunscreen on exposed skin, and wear them even when it is overcast — cloud blocks visible light far more than UV.
Snow is a mirror for ultraviolet light, and a bright winter day on a snowfield can expose you to more UV than a summer beach.
Eyes first
Snow blindness is painful rather than dangerous in the long term, and entirely avoidable. Wear glasses with category 3 or 4 filters, choose a shape with side coverage, and keep them on when it is overcast — cloud reduces visible light far more than it reduces UV.
Take a cheap spare pair. Glasses are the item most often lost on a winter walk.
Skin in the cold
Cold air makes sunburn easier to miss, because you do not feel warm. Apply high-factor sunscreen to face, ears, neck, and lips, and reapply at lunch, especially at altitude where UV is stronger.
Lip balm with an SPF is worth carrying separately — cracked lips are one of the most common winter complaints and the sun is usually involved.
Clothing that helps
A hood, a hat with a brim, and a buff pulled up over the neck cover more skin than sunscreen does, and they do not need reapplying. On a glacier or at altitude, covering up is the more reliable strategy.
The day after
If you do get burned or your eyes feel gritty, treat it as a recovery day. Cold plus sunburn is a genuinely exhausting combination, and dehydration is usually along for the ride. Drink more than you think you need, and keep your face out of the sun.
Frequently Asked Questions
What do the filter categories mean?
Category 3 suits bright sun and most snow travel; category 4 is for high altitude and glaciers and is too dark for driving. Look for side shields or a wraparound shape, because reflected light comes from below as well as ahead.
Do I need sunscreen in winter?
Yes, on any exposed skin. Cold does not reduce UV, snow reflection increases it, and wind makes the burn harder to notice until later.
How do I spot snow blindness coming on?
A gritty feeling, watering, and sensitivity to light hours after exposure. Once it starts, the treatment is rest in a dark room — so prevention is the whole strategy.
