Behavior of precipitation in the State of Paraiba in the First Half of 2011 José Alberto Araújo de Queiroz1 Elias Silva de Medeiros2 Marina Rodrigues Maestre2 Through maps of probability it was found which the State of Paraiba in the first half of 2011 showed areas where the rainfall is high probability of occurrence of rainfall below 100 mm, for the median value of the accumulated monthly precipitation. Keywords: Maps of Probability, Precipitation, State of Paraiba. 1 2 DE – UEPB. e-mail: [email protected] LCE – ESALQ/USP. 1