Table 2.

Description of heatwave definitions used in these analyses.

Heatwave Definition	Threshold percentile and mean maximum temperature (°Fahrenheit)	Duration (days)	Number of days (%)
HWD1	75 (88.11)	2	489,140 (17.97)
HWD2	75 (88.1l)	3	351,812 (12.93)
HWD3	75 (88.1l)	4	257,301 (9.45)
HWD4	90 (92.46)	2	166,943 (6.13)
HWD5	90 (92.46)	3	103,197 (3.79)
HWD6	90 (92.46)	4	6,4824 (2.38)
HWD7	95 (95.14)	2	75,787 (2.78)
HWD8	95 (95.14)	3	42,406 (1.56)
HWD9	95 (95.14)	4	23,797 (0.87)
HWD10	98 (98.11)	2	26,336 (0.97)
HWD11	98 (98.11)	3	11,886 (0.44)
HWD12	98 (98.11)	4	5,553 (0.20)