摘要：The objective of the work is constituted in characterizing the climate produced by the city of Fortaleza, under the level thermodynamic of the S.C.U. (MONTEIRO, 1976) in a linear dimension taking as a reference twelve experimental representative points of the urbane reality. For that there was the realization of two experiments in seasonal regimes differentiated with registers time-tables and simultaneous in profiles of 24 hours (7 at 6 hours).The first thing carried out in the southern autumn, period of the rainy block in the region, in the days 04 and 05/05/2007 and according to in the spring, period of the dry block, in the days 09 and 11/10/2007.The considered results follow the rhythm of the climatic of the seasonal analysed episodes, being the systems of atmospheric circulation determinative factors in the thermal behaviour of the city.The inquiry identified that the islands of heat in Fortaleza can exceed the value of 5ºC and take place with bigger frequency and intensity in the daytime period between 7 and 15 hours. The specializations of the islands of heat concentrated on the sectors south-west, west, northwest and central portion of the city.
