These Philly neighborhoods get the worst of the summer heat

A crew working at a Philadelphia warehouse Tuesday was well on its way toward building 120 combination shade stations and planters to be installed this summer on sidewalks in the Kingsessing, Point Breeze, Grays Ferry, and Haddington neighborhoods.

The stations, many of which have already been installed, are built of pressure-treated lumber and come with a bench, umbrella, and decorative planter.

“This idea started as a job creation and heat mitigation program but turned into a broader set of things,” said Franco Montalto, a Drexel engineering professor who directs the program. “We found that a lot of people like these planters. They create social opportunities, and they are an aesthetic improvement.”

The shade can’t come soon enough. Temperatures are forecast to reach 97 on Friday, setting up a dual summer ick for Philadelphians: high heat, high humidity. Together, they’ll combine to make it feel like 106.

This week’s heat wave comes on the heels of data showing Philadelphia ranks as the sixth highest U.S. city for the number of people experiencing an “urban heat-island effect” of more than 9 degrees compared to those living in nonurban areas. It is also one of the few cities that have neighborhoods exceeding 12 degrees of heat island effect.

The data from the nonprofit Climate Central provide a model for which city neighborhoods are most vulnerable during heat waves because of the density of sidewalks, streets and buildings, along with the lack of tree cover.

Parts of Center City rank among the top for a heat island effect of more than 12 degrees. Center City, however, certainly has residents but is mostly a large swath of offices and retail and not representative of the city’s true residential neighborhoods.

Those highly residential areas, such as Fairmount, Spring Garden, North Philadelphia, East Schuylkill, Southwest Center City, Point Breeze, Kensington, Bella Vista, and Southwark, all bake up to 10 degrees higher than surrounding neighborhoods outside the city, the data suggest.

City officials have said previously that temperatures in some neighborhoods, such as Hunting Park, can rise even higher, leaving medically vulnerable residents at risk. This year, Mayor Jim Kenney’s administration launched a 10-year Philly Tree Plan that calls for planting thousands of trees to increase the city’s canopy to 30% as a way of tackling the disparity.

» READ MORE: Philly to hire its first city forester, and plant thousands of trees over the next decade

In general, areas of the city near big parks, with more detached homes and more tree canopy fare much better. Pennypack, West Oak Lane, Overbrook, Olney, Frankford, Bustleton, Northeast Philadelphia, East Falls, and Manayunk all experience a heat-island effect of less than 7 degrees.

Climate Central did not base its study on actual temperatures, but rather on modeling that combines data from satellite imagery, impervious land cover, green space, building footprints, transportation, and census tract population data.

Scientists use the data to model which tracts would likely be warmer than others. For example, buildings, roads, and other infrastructure absorb and reemit the sun’s heat more than forests and rivers. Dark surfaces, such as black asphalt roofs, reflect less light and retain more heat. As a result, certain areas can become hotter during extreme heat relative to suburban and rural areas, according to the U.S. Environmental Protection Agency.

» READ MORE: ‘That house was like an oven’: How residents of Philly’s hottest neighborhoods are coping as temperatures rise

The heat-island effect strikes a mix of neighborhoods:

The data, however, differ from Philadelphia’s Heat Vulnerability Index, which is used to indicate neighborhoods most at risk during extreme heat events. The city’s index takes into account more than just temperature. It looks at social, economic and health factors such as age, education, language barriers, percent of people living in poverty, race and ethnicity, and social isolation. It looks at the number of people who have asthma, heart disease, and other health issues.

For example, the Climate Central data give a census tract in North Philadelphia a heat-island effect of 7.75 degrees, which is not among the highest in the city. But the city assigns the same tract a “very high” score on the Heat Vulnerability Index. The neighborhood is 95% nonwhite, many live below the poverty line and have obesity and hypertension.

Jennifer Brady, a former EPA staffer who conducted the analysis for Climate Central, said it makes sense that Center City would show a high degree of heat-island effect because of the population density, paucity of trees, tall buildings, and infrastructure that absorbs heat and reduces airflow.

The impact of heat on people in Center City might be much less than in other neighborhoods, Brady said. That’s because people in Center City tend to be wealthier with the means to escape or have easy access to air-conditioned apartments, offices, stores, or shaded square.

“There are other neighborhoods that are not only high risk, but you can’t walk three or four blocks to find any kind of cover or shaded area,” Brady said. “That’s not accounted for in the data. That’s something not explicitly in these numbers, but is an important consideration when you’re thinking about people being able to escape from the heat.”

So, lower-income residents of color tend to bear the brunt of extreme heat’s impact. In 2020, for example, the Hunting Park Neighborhood Advisory Committee surveyed residents about how they cope with heat and asked how many had air-conditioning. Out of 563 who answered, only 100 had air-conditioning.

To help residents cope, the city operates scores of cooling centers, which can include air conditioned buses.

» READ MORE: Philly’s summer temps have risen 3 degrees since 1970 — and nights have gotten even warmer

Back at the Drexel program, Oman Sewell, 42, of South Philly was working in a warehouse in Kingessing that Montalto’s program rents to build the shade-giving planters. The planters are placed with guidance from of local community organizations. It’s the fourth year of the program, which is funded by the William Penn Foundation and started with planter installations in Hunting Park.

Sewell started working in June under the tutelage of architect Angelo Zaharatos, founder of Arxis League, a New York-based design group. Sewell was busy Tuesday helping assemble the planters after having made many of the cuts on a miter saw.

Sewell is enthusiastic about the program and credits Zaharatos with daily uplifting readings that might come from, say, Marcus Aurelius, a Roman emperor and philosopher.

“Every day is a learning experience,” Sewell said. “It opens your mind, showing you can actually uses these building blocks and turn the skills into something you can use the rest of your life.”