What is the humidex?

Q: What is the humidex?


A: The humidex is a temperature index used by Canadian meteorologists to describe how hot the weather feels to a person, taking into account both heat and humidity.

Q: How does the humidex differ from the heat index used in the US?


A: The humidex differs from the heat index used in the United States, in being derived from the dew point rather than the relative humidity.

Q: What does a humidex of 30 indicate?


A: According to the Meteorological Service of Canada, a humidex of at least 30 causes "some discomfort".

Q: What happens when the humidex reaches 40?


A: When it reaches 40, it causes "great discomfort".

Q: What happens when it goes above 45?


A: Above 45 is considered "dangerous".
Q: At what level does heat stroke become very near? A: When it hits 54, then heat stroke is very near.

Q Who developed this formula for getting the humidex? A J.M. Masterton and F.A. Richardson of Canada's Atmospheric Environment Service developed this formula in 1979.

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