Waste heat generated by energy usage is a secondary contributor. The main cause of the urban heat island effect is from the modification of land surfaces. UHI is most noticeable during the summer and winter. The temperature difference is usually larger at night than during the day, and is most apparent when winds are weak. Normal temperatures of Tokyo go up higher than those of the surrounding area.Īn urban heat island ( UHI) is an urban area or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities. Tokyo, an example of an urban heat island.
