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11 <br /> Average First and Last Date When Chapel Hill Exceeds Threshold <br /> FIRST DATE <br /> $ Max Heat Index Max Air Temperature Threshold <br /> 4/23 4/7 85 F <br /> 5/29 5/23 90°F <br /> 6/20 7/16 95°F <br /> 6/5 7/5 100°F <br /> 7/19 NA 105°F <br /> Max Heat Index Max.Air Temperature Threshold <br /> Another way to define the heat season is by examining when 10/6 10/1 85°F <br /> temperatures and heat indices typically reach thresholds that may lead <br /> to heat-related health impacts.The table on the right shows the typical 9/21 9/11 90°F <br /> first and last dates where air temperatures and heat indices exceed 9/11 8/20 95°F <br /> given thresholds. 8/21 7/5 100°F <br /> While heat has impacts on health and community well-being during 7/28 NA 105°F <br /> and outside of the heat season,the heat season is typically when <br /> rates of heat-related illness are at their highest—especially during Table 3:A table showing the dates of when threshold temperatures are <br /> the beginning of the heat season,when people are less prepared for reached in Chapel Hill. This table also illustrates the"heat season"in <br /> extreme heat's effects. Chapel Hill. <br /> It is important to note that extreme temperature events have increased Data from State Climate Office of North Carolina https://products.climate. <br /> in frequency and severity since this data was published in 2020 and are ncsu.edu/cardinal/scout/ <br /> expected to continue to increase in the future.Extremely hot days are Note:The earlier average first date for 100°Fdays compared to 957days <br /> now routine in April,May,September and even October.As shown in likelyreflects the smallersample size ofyears in which the 1007threshold <br /> Figure 5,heat-related emergencies and emergency department visits was met or exceeded,rather than a true climatological trend. <br /> frequently occur early in the heat season when people are neither <br /> acclimatized to nor prepared for extreme heat events. <br /> Figure 5. Emergency Department Visits for Heat-related Illness and Max Heat Index <br /> North Carolina Statewide:May 1 - September 30,2025 <br /> 300 <br /> 190 <br /> 5 250 <br /> 170 <br /> a <br /> a <br /> � 7 <br /> a 200 150 <br /> m x <br /> a a <br /> = o <br /> o` 130 <br /> N 150 <br /> 110 E <br /> n E <br /> 100 x <br /> u 90 <br /> c <br /> w <br /> eo <br /> E 50 <br /> ry 70 <br /> 0 50 <br /> c0 h W A <br /> Dates <br /> +Emergency Dept.Visits for Heat-related Illness --*--Max Heat Index <br /> Figure 5.A line graph displaying the correlation between emergency department visits over the heatseason in the state of North Carolina.Increases in <br /> heat index correlate strongly with increases in emergency department visits with the highest number of emergency department visits happening earlier <br /> in the heat season. <br /> Source:NC DHHS Heat Report <br /> 9 <br />