Grade

Body feeling

Temperature-Humidity Index (I)

Wind-Efficiency

Index (K)

Description of the Feeling

of Healthy People

1

Freeze

<14.0

<−400

Feel very cold and uncomfortable

2

Chill

14. 0 - 16. 9

−400 - −300

Feel chill and less comfortable

3

Comfortable

17. 0 - 25. 4

−299 - −100

Feel comfortable and acceptable

4

Hot

25. 5 - 27. 5

−99 - −10

Feel a bit hot and less comfortable

5

Stuffy Hot

>27. 5

>−10

Feel stuffy hot and uncomfortable