What is the Humidex and why is it important?
The Humidex is a measure that describes the perceived temperature by combining air temperature and humidity. With high humidity, it feels warmer because the body is less effective at cooling itself through sweating.
Why is the Humidex useful?
The purpose of the Humidex is to provide an easily interpretable value that reflects the combined effects of heat and humidity. Although its calculation shares elements with the dew point and wet-bulb temperature, the Humidex is specifically designed to indicate how warm it feels under hot and humid conditions.
In cases of extreme temperatures, governments use the Humidex to emphasize extra caution for groups of people who are particularly sensitive to heat.
Summary
The Humidex uses a formula that combines temperature and humidity, taking into account the saturation vapor pressure. Although this approach shares elements with the dew point or wet-bulb temperature, the primary goal of the Humidex is to illustrate how humidity affects the perceived temperature, not to precisely calculate the dew point or wet-bulb temperature.
Humidex table
Based on temperature (°C) and relative humidity (%)
\( \text{Humidex} = T + 0.5555 \times \left(6.11 \times 10^{\left(\frac{7.5 \times T}{237.7 + T}\right)} \times H - 10\right) \)
Where
- T is the temperature in degrees Celsius
- H is the relative humidity in percent
- The term \( \left(6.11 \times 10^{\left(\frac{7.5 \times T}{237.7 + T}\right)}\right) \) approximates the saturation vapor pressure of water vapor at the given temperature.
Find the humidex calculator here
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