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<br /> Hazard Mitigation Plan | 2022 <br />Climate Change Hazards <br />- 85 - <br /> <br />average of 11 extreme heat days per year by mid-century and an average of 25 extreme heat <br />days per year by end of century. <br /> <br />Figure: Projected Extreme Heat Days in Santa Ana <br />(Source: Vulnerability Assessment Report for the General Plan Update, 2020) <br /> <br />Extreme heat can also occur in the form of warmer nights, as temperatures do not cool down <br />overnight and provide relief from the heat. In Santa Ana, a warm night occurs when the <br />temperature remains above 68.3 degrees Fahrenheit. As shown in the Figure below, the <br />projected number of warm nights in Santa Ana is projected to increase to an average of 39 warm <br />nights per year by mid-century and an average of 87 warm nights per year by the end of the <br />century. <br /> <br />Figure: Projected Warm Nights in Santa Ana <br />(Source: Vulnerability Assessment Report for the General Plan Update, 2020) <br />