Black Globe Temperature (BGT) is measured by a thermometer placed at the centre of a blackened sphere made of thin copper. It is currently determined using the following equation:
where T represents the air temperature in degrees Celsius and SR the solar radiation in W/m2.
- 0 – 19
- 20 – 24
- 25 – 29
- 30 – 34
- 35 – 39
- 40 – 44
- 45+