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WeatherCanadian Humidex Calculator
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The humidex, devised by Canadian meteorologists, was first used anywhere in the word in 1965. The purpose
was to create an easily understood method of describing how very hot and humid weather feels to the average
person. The humidex combines the temperature and humidity into one number to reflect the perceived
temperature. Because it takes into account the two most important factors that affect summer comfort, it
can be a better measure of how uncomfortable the air feels than either temperature or humidity alone.
The humidex is similar to the heat index but is widely used in Canada where the heat index is not.
It equals H = T + (0.5555 * (e - 10)), where T is the temperature in Celsius and e is the vapor pressure
in millibars (mb). This is the Canadian formula but there are variations of humidex throughout the world,
of both the exact formulae and of interpretation of the results. You may enter the temperature in either
scale though the actual calculation is done in degrees Celcius. We also do a conversion for you of the
Celsius temperature to Fahrenheit by way of the formula, Tf = (9/5)*Tc+32.
An extremely high humidex reading can be defined as one that is over 40. In such conditions, all unnecessary activity should be curtailed. If the reading is in the mid to high 30s, then certain types of outdoor exercise should be toned down or modified, depending on the age and health of the individual, physical shape, the type of clothes worn, and other weather conditions. If working outdoors is an absolute necessity, drink plenty of liquids and take frequent rest breaks. In hot, humid conditions, there is a considerable risk of heat stroke and sun stroke. Despite its brevity limitations, the humidex remains a useful, and very popular due to the simplicity, means of determining how hot it actually feels outside. | ||||||||||||||
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