The UV index is a calculated value which indicates the amount of UV exposure in direct sunlight. The values represent exposure as follows:
8-10 Very high - does not exceed 8 in the UK, and 8 is rare.
The Heat Index indicates a ‘feels-like temperature' calculated by combining the temperature and relative humidity. This graph is based on the maximum daily heat index values. A heat index value of 70 is approximately equal to a feels-like temperature of 21°C, 80 is 27°C, 90 is 32°C, and 100 is 38°C.
Shows the wind chill values calculated from actual temperature and wind speed - the "feels like" temperature. This graph is based on the lowest values each day.