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UV radiation from the sun is classified according to wavelength as UVA, UVB, and UVC. UVC rays do not reach the Earth’s surface. We are more worried about UVA and UVB rays.
UVB makes up 5% of the UV radiation that reaches us. It is harshest around noon and during the summer months. UVA rays make up 95% of UV rays that reach us. They are present throughout the day, all year round, even on cloudy days, making sunscreen just as important during monsoons and winters.
While UVB causes sunburn, a lot of the long-term sun damage and skin ageing are caused by UVA rays. To make sure we are well protected, a good broad-spectrum sunscreen with a high PA rating should be used even in the winter months.