This is a bar chart shows heat-related deaths in Maricopa County, Arizona, from 2006 through 2025. Deaths were generally below 200 per year through 2015. The count increased from 154 deaths in 2016 to 323 in 2020, then continued climbing to 425 in 2022, 645 in 2023 — the highest on record — and 608 in 2024. 2025 shows 185 deaths as of Sept. 27, 2025.