Humidex Calculator
The humidex is Canada answer to the heat index, a single number that describes how hot humid weather actually feels by combining the air temperature with the moisture in the air. It is issued by Environment Canada during summer and is the standard comfort measure across the country. Unlike the American heat index, the humidex is built from the air temperature and the dew point rather than the relative humidity, using the vapor pressure of water to add a humidity dependent bump to the temperature. This calculator applies the official Environment Canada formula, so the results match published advisories. Enter the air temperature and the dew point, choose Celsius or Fahrenheit, and read the humidex value along with the comfort category, which ranges from no discomfort in the twenties to dangerous above forty five. It is handy for anyone north of the border or comparing comfort scales. Everything runs locally in your browser for instant, private results.
How to use Humidex Calculator
- Enter the air temperature.
- Enter the dew point.
- Read the humidex value.
- Compare it to the comfort bands to judge the heat.
Frequently asked questions
How does the humidex work?
It uses the Canadian humidex formula, which adds a moisture correction based on the dew point to the air temperature to express how hot it feels.
How is humidex different from the US heat index?
Humidex is driven by dew point and reports a felt temperature in Celsius, while the US heat index uses relative humidity; both aim to capture the same muggy feeling.
When is a humidex uncomfortable?
A humidex around 40 causes great discomfort and above 45 is dangerous, since the body struggles to cool itself in that much moisture and heat.
What is Humidex Calculator?
The humidex is Canada answer to the heat index, a single number that describes how hot humid weather actually feels by combining the air temperature with the moisture in the air. It is issued by Environment Canada during summer and is the standard comfort measure across the country.
Is Humidex Calculator free to use?
Yes. Humidex Calculator is completely free, with no sign-up and no usage limits.
Does Humidex Calculator work in a web browser?
Yes. Humidex Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Humidex Calculator?
Yes. Humidex Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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