the formula is somewhat tedious, to the un-initiated.
thus the table.
for ease of use, they made a heat index table, quite similar to the multiplication table of our youth.
on the horizontal axis is the increasing temperature as measured by a thermometer.
on the y axis is the decreasing humidity, as measured probably by a humidity meter.
generally, as humidity or temperature, or both, increase, the heat index also increases.
bottomline,
i guess it means that we feel hotter as humidity increases, and cooler as humidity decreases.



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