The content of this website is no longer being updated. For information on current assessment activities, please visit

Urban Heat Island Effect

Urban Heat Island Effect

Large amounts of concrete and asphalt in cities absorb and hold heat. Tall buildings prevent heat from dissipating and reduce air flow. At the same time, there is generally little vegetation to provide shade and evaporative cooling. As a result, parts of cities can be up to 10ºF warmer than the surrounding rural areas, compounding the temperature increases that people experience as a result of human-induced warming.1  Image Reference: Lemmen and Warren2



High-resolution High-resolution JPEG
Photo Credit©Crown Copyright and Licensing, Canada