For many urban residents, it's even hotter than their weather app says

There's a strong chance that last week's scorching temperatures were even hotter than reported for those living in underserved urban areas. New research from environmental engineers has shown that citizen science tools used to gauge heat in these urban areas likely understate the problem of heat islands due to a lack of weather stations. The researchers also suggest a statistical method to improve estimates of urban heat.

New research from environmental engineers at Duke University has shown that citizen science tools used to gauge heat in these urban areas likely understate the problem of heat islands. The researchers also suggest a statistical method to improve estimates of urban heat.

While not exorbitantly expensive, personal weather stations cost several hundred dollars each. As one might expect, they're more commonly purchased and set up in wealthier neighborhoods than in poorer ones. And that can cause issues when relying on a large number of them for weather information. Unsurprisingly, there was a strong correlation between income and data, with more stations being set up in areas with higher median incomes. The researchers then did some statistical gymnastics and applied that same correlation to their trove of temperature data.

The team took Weather Underground's readings for Durham on that same 2021 day and applied their statistical correction across the city. They found that their results across the entire city -- and, most importantly, in the areas with few or no personal weather station data -- were much closer to the HeatWatch campaign's data.

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