Philly’s feeling the heat during recent waves, and it’s not just the temperature that’s gone up.

Philadelphia has had a hot summer.

By early August, there were 27 times that the temperature reached 90 or above in Philadelphia. A normal average is 30 for the entire year.

Climate change continues to bring hotter and wetter weather, but another consequence isn’t discussed as frequently: an increase in humidity.

Summer equivalent temperatures have increased three times than summer air temps since 1950, according to Climate Central.

This is dangerous because the combination of high heat and humidity can compromise our body’s ability to cool itself through sweating. Higher humidity levels limit evaporative cooling, which can lead to heat stress and illness.

Although the US North Central and Midwest regions have seen relatively modest increases in summer temps, there’s been a big increase in humidity.

Those at greatest health risks are vulnerable populations like children, older adults, athletes, outdoor workers, and communities of color.

How to stay cool during high heat

The City of Philadelphia opens cooling centers during extreme heat and humidity. You can find a cooling center on the City’s website.

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Julie Hancher is the co-founder and Executive Director of Green Philly, an independent media organization making sustainability accessible, affordable and actionable. Since launching Green Philly in 2008, she has grown it from a passion project into a leading voice for local climate storytelling, pairing impactful journalism with community events and experiences. Julie is a frequent speaker on climate, media innovation and the future of local journalism, and is the creator of SustainPHL and EcoFair. Outside of Green Philly, you can find her hiking, biking, traveling, or exploring Philadelphia. View all posts by Julie Hancher