Hey Kamalakar, Most travellers prefer visiting Tawang during summer as the weather is ideal then. People believe March, April, May, June, September and October to be the best months to go to Tawang. You could plan a visit in November, but be prepared for some frigid weather. You might experience snowfall too hence roads to some of the tourist attractions can get blocked. Check out some guides on Tripoto to plan your itinerary : https://www.tripoto.com/travel-guide/tawang Hope this helped!