As cities across the tropics search for ways to cope with rising temperatures, Singapore has increasingly turned to a familiar, low-tech solution: trees. A specific figure keeps surfacing in planning documents and public discussion: the claim that shading a street with trees can lower street-level temperatures by as much as 2.6 degrees Celsius. That number has real scientific grounding, but tracing exactly where it comes from, and what local Singapore research has since found on its own streets, reveals a more layered and, in some ways, more useful picture than the headline figure alone suggests. Researchers have also found that the cooling effect depends on factors such as tree species, canopy density, street orientation, building layout, and humidity. Together, these elements influence how effectively urban greenery improves outdoor comfort and reduces heat exposure for pedestrians.
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