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 |