Which specific microclimatic and topographic condition accounts for the relatively lower rainfall recorded in the shadow of high ridges in North Sikkim compared to the southern windward slopes?

💡 Solution & Explanation

The towering ridges of the Greater Himalayas act as a massive orographic barrier that forces moisture-laden winds to drop most of their precipitation on southern windward slopes, leaving interior northern valleys in a pronounced rain-shadow effect. Foehn winds are warm and dry winds descending lee slopes in specific mid-latitude mountain ranges like the Alps, whereas Sikkim's interior dryness stems directly from Himalayan blocking. This creates striking ecological contrasts ranging from lush tropical forests in the south to cold arid cold-desert conditions in upper North Sikkim.