Skip to main content
. Author manuscript; available in PMC: 2018 Jan 25.
Published in final edited form as: Glob Environ Change. 2013 Apr;23(2):475–484. doi: 10.1016/j.gloenvcha.2012.12.011

Table 2.

Normal daily high & low heat index (HI)a,b in July & January for case study cities

Case Study City July daily high HI
F(C)		 July daily low HI
F(C)		 January daily high HI
F(C)		 January daily low HI
F(C)
Detroit, Michigan 82.58 (28.10) 65.44 (18.58) 29.28 (−1.51) 22.74 (−5.15)
New York City, New York 84.49 (29.16) 72.11 (22.28) 36.78 (2.65) 30.63 (−0.76)
Philadelphia, Pennsylvania 87.72 (30.96) 70.58 (21.44) 38.45 (3.58) 29.49 (−1.39)
Phoenix, Arizona 104.77 (40.43) 85.65 (29.80) 66.27 (19.04) 47.07 (8.37)
a

Source: Hourly Heat Index 30-Year (1981–2010) Climate Normals, National Climatic Data Center, 2011

b

Heat index is a composite measure of air temperature and relative humidity. Data are collected at Detroit Metropolitan Airport, New York La Guardia Airport, Philadelphia International Airport, and Phoenix Sky Harbor International Airport.