# Temperature formulas (Heat Overlay)

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Two temperature formulas are used in the calculation of the PET value:

## Atmospheric Temperature formula

where

- is the calculated atmospheric temperature at time t;
- is the temperature measured at a weather station at time t;
- is the calculated Urban Heat Island effect at time t;
- is the sun daily motion factor at time t;

## Wet-bulb Temperature formula

where:

- is the calculated wet-bulb temperature;
- is the calculated atmospheric temperature;
- is the sun altitude angle;
- Constant values are sourced from the DPRA Heat stress report;

## See also

- ↑ Wikipedia • Wet-bulb temperature • https://en.wikipedia.org/wiki/Wet-bulb_temperature • Last visited: 20-12-2019