Data and Code for <b>Regulation of humid heat by</b><b> </b><b>urban greenspace</b><b> </b><b>across a climate wetness gradient</b>

Greenspaces are a common strategy for adaptation to urban warming. While they have been demonstrated to reduce air temperature, much less is known about their effect on air humidity. Because human heat stress is contributed by both temperature and humidity, it is important to quantify the relationship between the effects of both. Using mobile measurements in 15 cities, we show that the daytime temperature effect is negatively correlated with the humidity effect, resulting in an insignificant change in the wet-bulb temperature or humid heat. A net reduction in humid heat was observed at night in intermediate (summer precipitation: 180 to 570 mm) and wet climates (summer precipitation &gt; 570 mm). A model simulation revealed that the nighttime reduction resulted mostly from reduction in soil heat storage in vegetated land. These nuanced microclimate responses to urban vegetation caution against a one-size-fits-all solution to climate adaptation.