利用1981-2017年印度东北部阿萨姆邦26个地点的数据，分析了阿萨姆邦长期降水的时空变化特征。利用Mann-Kendall和Sen坡度试验评估了不同次区域的年、月和季节性降雨趋势。9月、12月、1月和2月呈现下降趋势，而5月、6月和8月呈现统计上明显的增长趋势。同样，年、季风前和季风季节的降雨量呈增加趋势，而季风后和冬季的降雨量呈统计上不显著的减少趋势。Demaji、Dibrugarh、Karimganj和North Lakhimpur的年降雨量超过2000毫米。在季节时间尺度上，阿萨姆邦季风前和季风降水呈增加趋势，统计趋势显著。季风后降水和冬季降水均呈减少趋势，但趋势在统计上不显著。在季风季节，第一个十年(2001-2010年)有下降趋势。与阿萨姆邦雅鲁藏布江流域的中部地区相比，该邦南部和东北部的年平均降雨量最大。降水量变化最大的地区为Karimganj(36.8%)、Hailakandi(31.9%)、Silchar(31.9%)和Dhuburi(26.5%)。 Any slight variations in the rainfall trend could certainly be vulnerable as the state of Assam which comprises valley flood plains and sub-Himalayan boundaries, also supports a large chunk of human as well as ecosystem populations. In the present scenario, extreme and unprecedented rainfall events can affect agricultural activities, stream flow, the availability of food, etc., which may lead to disparities in the socio-economic conditions of the area. The results would be beneficial to policymakers in understanding the impact of changing climates and assessing the climatic vulnerability of natural and human resources.