Analysis of Precipitation Climate and Evapotranspiration in Kerman of Iran

Rainfall and evapotranspiration are the two most popular climatic factors which have crucial function on agricultural production. Rainfall can be directly measured easily in an area but evapotranspiration is estimated from weather data. In this study reference evapotranspiration ETo was estimated using Penman–Monteith equation. Monthly rainfall and evapotarnspiration were plotted and compared in order to determine moisture deficit periods for two main several stations in Kerman Province which located in south east of I.R. of Iran. Temporal variation of annual rainfall was analysed using rainfall anomaly index. It was found that the moisture deficit in both stations is obvious for whole year and irrigation requirement is high for agricultural production. ETo showed relatively low variation with time while year-to-year rainfall variability was very high. Rainfall Anomaly Index (RAI) values was plotted and from these plots information on rainfall pattern over the past 33 years, such as drought years was obtained.