Why Sunscreen Remains Essential in Winter
As winter approaches and temperatures drop, it’s tempting to believe that your skin is safe from sun damage. But this couldn’t be further from the truth. Ultraviolet (UV) rays, responsible for premature ageing and skin cancer, don’t take a break in the winter months. While we may feel the warmth of the sun less, understanding how UV rays work reveals why sunscreen remains essential all year round.
The Science of UV Rays
UV radiation, emitted by the sun, is composed primarily of UVA and UVB rays. UVA rays penetrate deeply into the skin and remain strong throughout the year, regardless of the temperature. Unlike UVB rays, which diminish in intensity in the winter, UVA rays persist and cause long-term damage at the cellular level, breaking down collagen and elastin and accelerating ageing. These rays are also associated with skin cancer, including melanoma, one of the most serious forms of skin cancer.
In addition, UVB rays, though weaker in winter, are reflected off snow and ice, doubling exposure in snowy conditions. In fact, fresh snow reflects up to 80% of UV radiation, intensifying the impact on exposed skin. This reflection can catch many off guard, particularly those engaged in winter sports like skiing and snowboarding, making it essential to reapply sunscreen regularly.
Winter-Specific Risks
During winter, the ozone layer – Earth’s natural shield against UV radiation – is at its thinnest, increasing the potential for harmful UV exposure even on cloudy days. This layer varies seasonally and tends to be thinner in colder months, allowing more UV rays to reach the Earth’s surface. For those living in the Northern Hemisphere, the Earth is closer to the sun during winter, making UV rays more direct and potent despite the cool temperatures.
Indoor and Window Exposure
Modern lifestyles also keep us exposed to UV rays indoors. While typical glass windows block UVB rays, they allow UVA rays to penetrate. This means that whether you’re sitting by a sunny window at home, driving, or flying, you’re still vulnerable to UVA damage. Blue light from screens adds to this exposure, with emerging research suggesting that prolonged exposure to blue light may accelerate skin ageing and compromise skin health.
Best Winter Sun Protection Practices
For effective winter skin protection, dermatologists recommend a broad-spectrum sunscreen with at least SPF 30, applied generously to all exposed skin and reapplied every two hours, especially in windy or snowy conditions. Products combining moisturising benefits are particularly beneficial, as winter weather can strip skin of moisture, increasing its sensitivity to environmental damage.
Sunscreen, therefore, is not just for beach days and holidays. Incorporating it into your winter skincare routine helps maintain skin health, prevent premature ageing, and lower the risk of skin cancer – proving that protecting your skin from UV radiation is a year-round commitment.
