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Definition of Urban heat island

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heat island, area (such as a a city or industrial compound) with higher temperatures than in the surrounding region resulting from the generation and retention of heat by its structures or pavements and heat created by human activity
Urban heat island Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
An urban heat island (UHI) is a city or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities. The phenomenon was first investigated and described by Luke Howard in the 1810s, although he was not the one to name the phenomenon. The temperature difference usually is larger at night than during the day, and is most apparent when winds are weak. UHI is most noticeable during the summer and winter. The main cause of the urban heat island effect is from the modification of land surfaces. Waste heat generated by energy usage is a secondary contributor. As a population center grows, it tends to expand its area and increase its average temperature. The less-used term heat island refers to any area, populated or not, which is consistently hotter than the surrounding area.

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