Tibet and India border, why is India so hot and Tibet so cold?

Hello! Because the altitude of Tibet is much higher than that of India, and the latitude of India is lower than that of Tibet.

Think about Tibet as a whole located within the Qinghai-Tibet Plateau, and the Qinghai-Tibet Plateau has an average altitude of 4,000 to 5,000 meters. As for India, there are two main plateaus in its territory, namely the Deccan Plateau and the Central Plateau. The average altitude of the former is 500-600 meters, and the average altitude of the latter is about 500 meters. Compared with the Qinghai-Tibet Plateau, these two plateaus are as incomparable as a dwarf seeing a giant.

However, India also has a small area in the Himalayas, and the climate of this small area is similar to that of Tibet.