Relationship between Indian summer monsoon rainfall and Eurasian snow in the preceding seasons is studied extensively. However, the spatial structures of this snow-monsoon relation have rarely been investigated. The present study is aimed at diagnosing nature of observed linkage between Eurasian winter snow and spatial distribution of following summer monsoon rainfall over India. Eurasian snow association with spatial distribution of rainfall over India features a tri-polar pattern of significant negative-positive-negative correlations over the northern, east-central and peninsular regions of India respectively. The physical mechanism underlying snow-monsoon connection is envisaged through two pathways. One of the channels is through Eurasian winter snow directly affecting the monsoon by modulating large scale circulation, while the other way is indirectly through Tropical Eastern Pacific (TEP) Sea Surface Temperatures (SSTs). Enhanced Eurasian wintertime snow is associated with warm TEP SSTs from preceding winter through to the following summer, leading to anomalous large scale zonal circulation during summer monsoon season, thereby affecting rainfall over India. The spatial facets of snow-monsoon relationship remain unaltered by Indian Ocean Dipole and North Atlantic Oscillation modes.

印度夏季风降雨量与前几个季节欧亚降雪之间的关系得到了广泛研究。然而，很少研究这种雪季风关系的空间结构。本研究旨在诊断欧亚冬季降雪与印度随后夏季季风降雨的空间分布之间观察到的联系的性质。欧亚降雪与印度降雨空间分布的关联特征分别为印度北部、中东部和半岛地区显着负正负相关的三极模式。雪季风联系的物理机制是通过两条途径设想的。其中一个渠道是通过调节大规模环流直接影响季风的欧亚冬季降雪，而另一种方式是间接通过热带东太平洋 (TEP) 海面温度 (SST)。增强的欧亚冬季降雪与从前一个冬天到下一个夏天的温暖 TEP SST 相关，导致夏季季风季节的异常大规模纬向环流，从而影响印度的降雨量。印度洋偶极子和北大西洋涛动模式未改变雪季风关系的空间方面。