Table 1.

State-specific population and heat index distribution with information on heat index values for issuing heat alerts

Climate region	State	No. of counties with population greater than 10,000 people	Average yearly state population (2003–2012)*, millions	Percent of average yearly US population (2003–2012)	Daily maximum heat index distribution, °F					Median and range of heat index values used for issuing heat alerts
					5th percentile	25th percentile	Median	75th percentile	95th percentile
Central	Illinois	87	12.6	4.2	62	74	82	91	104	109 (101, 118)
	Indiana	88	6.4	2.1	64	75	82	91	103	108 (100, 116)
	Kentucky	99	4.1	1.4	67	78	85	93	104	107 (101, 116)
	Missouri	89	5.7	1.9	67	79	88	98	109	109 (102, 116)
	West Virginia	44	1.7	0.6	64	74	80	87	96	104 (96, 113)
East North Central	Iowa	76	2.8	0.9	63	75	83	92	106	110 (98, 120)
Northeast	Maryland	24	5.7	1.9	65	75	83	90	100	104 (97, 111)
	New York	61	19.3	6.4	61	71	78	84	95	100 (95, 111)
	Rhode Island	5	1.1	0.4	59	69	75	83	93	101 (93, 113)
Northwest	Oregon	29	3.7	1.2	57	67	74	80	88	90 (82, 101)
South	Kansas	39	2.5	0.8	68	80	89	99	109	108 (98, 114)
Southeast	Florida	65	18.3	6.1	85	92	96	100	105	109 (107, 111)
	Georgia	127	9.1	3.0	76	85	91	97	104	107 (101, 111)
	North Carolina	97	9.1	3.0	71	82	88	95	102	107 (102, 112)
	Virginia	115	7.7	2.5	67	77	85	92	101	106 (100, 112)
Southwest	Arizona	14	6.1	2.0	82	90	96	101	106	104 (96, 109)
	Colorado	38	4.7	1.6	61	74	80	84	89	91 (91, 92)
	Utah	20	2.6	0.9	59	73	81	85	90	100 (100, 104)
West	California	55	36.5	12.1	69	77	82	86	91	92 (86, 97)
	Nevada	10	2.5	0.8	73	83	90	94	99	99 (93, 103)
West North Central	Nebraska	27	1.5	0.5	65	78	86	95	107	109 (104, 115)
	South Dakota	18	0.6	0.2	60	73	82	89	100	106 (100, 112)

^*Only including counties in the state with population greater than 10,000.