United States map showing approximate number of days per year when temperature-humidity index is above 72. The Southeast experiences about 100 to 150 days above THI 72 each year.

Figure 5. Long-term (30-year) estimated days per year with THI index greater than 72.

United States map showing approximate number of days per year when temperature-humidity index is above 72. The Southeast experiences about 100 to 150 days above THI 72 each year.