Hello You can go to 1)Shimla 2)Manali 3)Gangtok Best is go to Gangtok and North sikkim(Untouched Paradise on Earth). Have a look yourself On the videos and pictures on my tripoto posts.
Hi Ankit, there are a lot of places to experience snowfall in Dec. the best chances are in Manali and Auli. Both of them are well connected with other cities and they remain open throughout winters.