UV Index

UV Index

Posted by Monax Test and Weather on 9th Jan 2022

A complete weather station may well measure UV Index. Whilst related to solar radiation measurement (irradiance), it is not the same as shorter wavelengths of radiation cause more damage. UV Index therefore weights dose by wavelengths and divides the result by 25mW/m 2 to give you an index from 0-11+

UV Index Colour Risk Recommendation
0-2 Green Low Wear sunglasses on bright days. If you burn easily, cover up and use broad spectrum SPF 15+ sunscreen.
3-5 Yellow Moderate Stay in shade near midday when the Sun is strongest. If outdoors, wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 15+ sunscreen every 1.5 hours, even on cloudy days.
6-7 Orange High Reduce time in the sun between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 15+ sunscreen every 1.5 hours, even on cloudy days.
8-10 Red Very High Minimize sun exposure between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 15+ sunscreen every 1.5 hours, even on cloudy days.
11+ Purple Extreme Try to avoid sun exposure between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 15+ sunscreen every 1.5 hours, even on cloudy days.