Abstract
This paper propose an analysis average annual rainfall in the future for agriculture purpose planning. The Decision and policy makers in managing irrigation for agriculture and promoting farm in Sansai District, Chiang Mai. In the study, researchers used data on average monthly rainfall of the year 1993–2012, at the station in Sansai District, Chiang Mai of Hydrology and Water Management Northern Irrigation Department to analyze trends and predict the trend of rainfall. The rainfall trend analysis is predicted based on the analysis of time series and descriptive statistics. The average annual rainfall data analysis has proposed. The trend of the average monthly rainfall in the next 5 years ahead is increasing. Sansai District, Chiang Mai is the trend increased in the period January–October of each year and will decline during November–December of each year. The results of this analysis will be used in planning, water management, irrigation of agricultural crops and the amount of water that is appropriate.
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