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Heat Index vs. Humidity

The influence of humidity on the apparent temperature and the heat index.

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The Heat Index - or the Apparent Temperature - is used to indicate how hot it feels when relative humidity is combined with temperature.

With increased humidity it feels hotter as indicated in the Heat Index table bellow:

Heat Index
Dry Temperature		Relative Humidity (%)
(^oF)	(^oC)	0	10	20	30	40	50	60	70	80	90	100
70	21.1	64	65	66	67	68	69	70	70	71	71	72
75	23.9	69	70	72	73	74	75	76	77	78	79	80
80	26.7	73	75	77	78	79	81	82	85	86	88	91
85	29.4	78	80	82	84	86	88	90	93	97	102	108
90	32.2	83	85	87	90	93	96	100	106	113	122
95	35	87	90	93	96	101	107	114	124	136
100	37.8	91	95	99	104	110	120	132	144
105	40.6	95	100	105	113	123	135	149
110	43.3	99	105	112	123	137	150
115	46.1	103	111	120	135	151
120	48.9	107	116	130	148

Heat and Humidity Index Danger Zones

90 - 104 : Heat cramps or heat exhaustion possible
105 - 130 : Heat cramps or heat exhaustion likely, heatstroke possible
130 and more : Heat stroke highly likely

Example - Apparent Temperature

From the table - with dry temperature 85 ^oF and relative humidity 80% - the apparent temperature - or Heat Index - is 97 ^oF.

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Related Topics

Air Psychrometrics - Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

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Clothing, Activity and Human Metabolism - Human metabolism at low and high activity with different levels of clothing.
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