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While air temperature is the most common way to gauge heat, it doesn’t always tell the full story. Land surface temperature – the temperature of the surface measured via satellite – can run far hotter than the air above it, particularly in blighted urban areas covered in impervious surfaces like concrete and asphalt. On hot, sunny days, land surface temperatures can exceed air temperatures by more than 30°F, making it a critical metric for understanding heat exposure, urban heat islands, and the impact of climate change on human and natural systems.
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