METEOROLOGY – URFACE TEMPERATURE & THERMAL COMFORT CALCULATOR
Humidex
A precise tool.
What is the Humidex & How does it work?
The Humidex is a measure used in Canada to describe how hot it feels when the humidity is factored in with the actual air temperature. It combines the effects of heat and humidity into a single value that reflects the perceived temperature.
The formula for calculating the Humidex is based on the dew point temperature and the dry bulb temperature. The dew point temperature is the temperature at which air becomes saturated with water vapor, and the dry bulb temperature is the actual air temperature.
The formula for calculating the Humidex is based on the dew point temperature and the dry bulb temperature. The dew point temperature is the temperature at which air becomes saturated with water vapor, and the dry bulb temperature is the actual air temperature.
Humidex = T + 0.5555 times (6.11 times e^{frac{5400}{273+T_{dew}}} – 10)
T = dry bulb temperature in Celsius
Tdew = dew point temperature in Celsius
e = base of the natural logarithm
Tdew = dew point temperature in Celsius
e = base of the natural logarithm
Parameters
Result
—
Frequently Asked Questions
What is the Humidex?
The Humidex is a measure used in Canada that combines air temperature and humidity to indicate how hot it feels.
How do I calculate the Humidex?
Use the formula based on dew point and dry bulb temperatures to calculate the Humidex value.
Why is the Humidex important?
The Humidex helps people understand the perceived temperature, which can be higher than the actual air temperature due to humidity.
What does a high Humidex value mean?
A high Humidex value indicates that it feels much hotter than the actual air temperature because of high humidity.
Can I use this calculator for locations outside Canada?
While developed in Canada, the Humidex can be used in other humid climates to understand perceived temperatures.
How does the Humidex differ from heat index?
The Humidex is specific to Canadian conditions and uses dew point temperature, while the heat index is more commonly used in the United States and considers relative humidity.
What should I do if the Humidex value is very high?
If the Humidex is very high, it’s advisable to stay indoors, drink plenty of water, and avoid strenuous activities to prevent heat-related illnesses.
Results are for informational purposes only and do not constitute professional advice.