Apparent Temperature Calculator ('Feels Like', Steadman)
How warm or cold it feels from the air temperature, humidity and wind together, with the formula used by the Australian Bureau of Meteorology.
Results
The dashed line marks the value you entered.
What this tool does
Most 'feels like' figures use the heat index in the heat and wind chill in the cold, and switch between them. Steadman's apparent temperature combines both in one formula: humidity makes warm air feel hotter because sweat evaporates less, and wind makes any air feel cooler. This is the version without solar radiation, for the shade; in full sun it can feel several degrees warmer. Use the wind measured at the standard 10 m height, which is what forecasts give.
Formula
AT = T_a + 0.33 e − 0.70 ws − 4.00 · e = (RH ÷ 100) × 6.105 × e^(17.27 T_a ÷ (237.7 + T_a)) (Steadman 1994)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
ta | Air temperature | °C |
rh | Relative humidity | % |
ws | Wind speed (at 10 m) | m/s |
AT | Apparent temperature | °C |
E | Water vapour pressure | hPa |
DF | Difference from the real temperature | °C |
Worked example
- Air temperature25 °C
- Relative humidity60 %
- Wind speed (at 10 m)3 m/s
- Apparent temperature25.2 °C
- Water vapour pressure18.9 hPa
- Difference from the real temperature0.2 °C
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- The default values are typical reference figures, not measurements of your situation. Replace them with your own data whenever you have it.