what causes rainfall during winter in north western part of india ??
well it is the western disturbances which arise from the mediterrean sea ... or the westerlies... as soon as these winds reach near the Himalayas , they reach the region of easterles and thus they pour showers by the time of winters... then these winds take a turn towards the Bay of Bengal. There they absorb the moisture and thus it showers in tamil nadu and in orrisa.