Northern Indian rivers are primarily fed by wintertime (December, January, February—DJF) precipitation, in the form of snow—yielded by eastward moving synoptic weather systems called Western Disturbances (WDs), over the western Himalayas (WH). This accumulated snow melts during ablation period. In the context of today’s warming atmosphere, it is imperative to study the changes in the temperature and precipitation patterns over the WH to assess the impact of global warming on climatic conditions of the region. Keeping that in mind, observational analysis of temperature and precipitation fields is planned. In the present study various climatic indices are analyzed based on wintertime (DJF) data of 30 years (1975–2006) obtained from the Snow and Avalanche Study Establishment (SASE), India. Results indicate enhancement in the surface air temperature across the WH. Percent number of warm (cold) days have increased (decreased) during 1975–2006 over the WH. Further analysis of precipitation reveals slightly decreasing but inconsistent trends.
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机译：印度北部的河流主要是由冬季（12月，1月，2月，DJF）以雪的形式降雨，这是由喜马拉雅山脉（WH）上的向东移动的天气天气系统，称为西部扰动（WD）产生的。积雪在消融期间融化。在当今气候变暖的背景下，必须研究WH上温度和降水模式的变化，以评估全球变暖对该地区气候条件的影响。请记住，计划进行温度和降水场的观测分析。在本研究中，根据从印度Snow and Avalanche研究机构（SASE）获得的30年（1975-2006）的冬季（DJF）数据对各种气候指数进行了分析。结果表明整个WH的地表气温升高。在1975-2006年期间，暖冬的天数（冷天）增加了（减少）。对降水的进一步分析显示出略有下降但趋势不一致。
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