Variability in number of rainy days in state of Sergipe – SE

Abstract

Among the many factors that affect human activities, mainly agriculture, the climate is distinguished by its decisive influence on the variations presented by the irregularities in the dry and wet periods in the given region. Among the variables that make up the climate, especially for annual crops, rain is the variable that most affects the result of crop production. In this sense, the objective was to evaluate the variability of rainfall data for the State of Sergipe, SE, through the preparation of maps of the average number of rainy days, and the coefficients of variation (CV) of rainfall and the number of rainy days for annual periods, dry and rainy. In this work it was used the series of monthly total rainfall of 40 rainfall stations with at least 30 years of data, continuous and seamless. We found that the highest values of the coefficient of variation are associated with lower levels of rainfall and number of rainy days. The variability of rainfall is lower in regions with rainy periods, when compared to dry periods.