Odds biweekly occurrence of maximum air temperatures in the city of TeresinaPiauí Daris Correia dos Santos1 Raimundo Mainar de Medeiros2 Daiane Correia Santos3 José Ivaldo Barbosa de Brito4 Abstract This study aims to calculate the probabilities of occurrence of maximum temperature and minimum air for the city of Teresina, PI, scale biweekly for all months of the year at different levels of probability. We used data daily maximum temperature and minimum air, obtained from the Instituto Nacional de Meteorologia. Keywords: Log-Normal, adhesion tests, probability levels. 1 Engenheira Sanitarista e Ambiental, Mestranda em Meteorologia/PPGM, UFCG, Campina Grande - PB, Av. Aprígio Veloso 882, CEP 58109-970, e-mail: [email protected] 2 Meteorologista, Doutorando em Meteorologia/PPGM, UFCG, Campina Grande - PB, Av. Aprígio Veloso 882, CEP 58109-970, e-mail: [email protected] 3 Graduanda em Geografia, UFCG, Campina Grande - PB, Av. Aprígio Veloso 882, CEP 58109-970, e-mail: [email protected] 4 Meteorologista, Prof. Dr. Unidade Acadêmica de Ciências Atmosférica-UFCG, Campina Grande - PB, Av. Aprígio Veloso 882, CEP 58109-970, e-mail: [email protected]