Dallas study identifies heat islands 10 degrees hotter than other areas

• Data on heat islands can guide city planners on where more trees should be planted and whether cooling paving technology should be used.

Driving the news: The hottest part of Dallas on Aug. 5, 2023, was 110 degrees — nearly 10 degrees hotter than other areas, according to a joint study released this week by the city of Dallas and the National Oceanic and Atmospheric Administration.

• Volunteers collected more than 60,000 measurements of ambient temperature and humidity data across more than 100 square miles of Dallas in the study.

What they found: Heat stayed concentrated in the area around heavy industrial-commercial development in northwest Dallas, whereas southeast Dallas with swaths of preserved land stayed cooler throughout the day.

• Plus, the area around Cedar Crest Golf Course was cooler.

By the numbers: Between 6-7am, the coolest temperature at a spot was 81.9° compared to 89.7° in the warmest.

• By 3-4pm, the temperature reached 110.1° at the hottest spot, compared to 100.9° in the coolest.
• Between 7-8pm, the hottest spot was 105.6°, compared to the coolest at 95.6°.

• Shaded, tree-lined residential streets kept temperatures down, the researchers found.
• Concrete jungles, like downtown, created heat islands.

Losers: The Dallas heat islands include the neighborhoods around downtown, Uptown and Deep Ellum. Oak Lawn, the Medical District and Love Field were also heat islands. Others are:

• Design District
• West Dallas
• Bishop Arts
• Stemmons/Market Center

Threat level: Residents in disadvantaged neighborhoods without much greenspace may be more at risk for heat-related health problems.

• The researchers suggest the city develop a heat action plan to identify ways to bring down temperatures in hot neighborhoods.

What's next: The city plans to continue heat mapping this summer.