Table 2. Ranges of thermal indices,...

Table 2.

Ranges of thermal indices, including predicted mean vote, physiological equivalent temperature and universal thermal climate index with respect to grades of thermal perception and physiological stress

PMV	PET (°C)	UTCI (°C)	Physiological stress
Below −3.5	Below 4	Below −40	Extreme cold stress
–	–	−40 to −27	Very strong cold stress
−3.5 to −2.5	4–8	−27 to −13	Strong cold stress
−2.5 to −1.5	8–13	−13 to 0	Moderate cold stress
−1.5 to −0.5	13–18	0–9	Slight cold stress
−0.5 to 0.5	18–23	9–26	No thermal stress
0.5–1.5	23–29	–	Slight heat stress
1.5–2.5	29–35	26–32	Moderate heat stress
2.5–3.5	35–41	32–38	Strong heat stress
–	–	38–46	Very strong heat stress
Above 3.5	Above 41	Above 46	Extreme heat stress

PMV	PET (°C)	UTCI (°C)	Physiological stress
Below −3.5	Below 4	Below −40	Extreme cold stress
–	–	−40 to −27	Very strong cold stress
−3.5 to −2.5	4–8	−27 to −13	Strong cold stress
−2.5 to −1.5	8–13	−13 to 0	Moderate cold stress
−1.5 to −0.5	13–18	0–9	Slight cold stress
−0.5 to 0.5	18–23	9–26	No thermal stress
0.5–1.5	23–29	–	Slight heat stress
1.5–2.5	29–35	26–32	Moderate heat stress
2.5–3.5	35–41	32–38	Strong heat stress
–	–	38–46	Very strong heat stress
Above 3.5	Above 41	Above 46	Extreme heat stress

Notes:

For predicted mean vote, internal heat production is set to 80 W and clothing insulation at 0.9 clo.

Sources: Fanger (1972); Matzarakis and Mayer (1996); Matzarakis et al. (1999); and Zare et al. (2018). PMV = physiological equivalent temperature; PET= predicted mean vote; UTCI = universal thermal climate index

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