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UV Index

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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.


Beaufort Scale

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Wind Chill and Heat Index

Wind Chill and Heat IndexMany Weather Stations show values for Wind Chill and Heat Index, but more often that not, these are not different from the current temperature. Why?This is because Wind Chill only applies when the average wind speed is above 4.8 kph and the temperature is below 10 degrees Celsius.Heat index only applies when the temperature is above 27 [...]

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