Yes, December is a good time to do NorthEast India, the weather is perfect its not hot and humid, there is no rain so all the places are accessible. Also not all the places in North East receive snowfall so there is no issue of roads getting blocked as well. I'm also attaching with this comment a post about backpacking across Northeast which will help you plan your trip.
Yes, december is a good month, but considering the cold weather, you need to take care for various things, you can consider going to south, its really beautiful
Yeah, it's a really good time to go. The weather will be a little bit chilly but the beautiful sight of snow covered mountains will be worth it. If you want to enjoy snowfall, head to North Sikkim. In short, you will enjoy a lot. Happy travelling !!!
Temperature – The air temperature during the season of winter fluctuates between 0°C and 22°C. Weather – The weather of North East India in winter ranges from chilly to biting cold, depending upon the State in question. Higher altitude regions such as Arunachal Pradesh and Sikkim drop to sub-zero temperatures, with accompanying snow fall and icy landscapes. Lower altitude regions such as Mizoram and Tripura are blessed with mild winters that exude pleasant temperatures and enable you to navigable plains. In general, this season sparkles with crisp air and a rejuvenating atmosphere. Significance – The season of winter is the absolute perfect time for individuals to explore the quaint mountain villages and country sides of North East India. When blanketed in snow, the plains take on breath-taking beauty like no other. The fascinating tribes, bold culture, thrilling wildlife and blooming flora stand out fiercely. Roing and Tawang, in Arunachal Pradesh, are particularly ethereal winter spots to traverse. With its sacred monasteries and abbeys, amidst spectacular natural sky lines, one may never want to leave! Why you should visit now – Winter is perhaps the best season to visit North East India in, if you’re looking to navigate the national parks and wildlife sanctuaries. In fact, the world famous Kaziranga National Park is especially thrilling during this time. Imagine spotting the one-horned rhinoceroses and Ganges River Dolphin, while the air fizzles with a delicious chill. Safaris are best taken when the atmosphere is cool. Furthermore, this season bustles with colourful celebrations such as the magnificent Hornbill Festival. Things to know before the visit – The upper regions of North East India experience snowfall in the months of November, December, January and early February. If you’re looking to experience the wonders of this weather, you might want to plan your trip during the former months. However, there is a risk of landslides and road blockages during this time. This season is deemed as shoulder season, with a flood of tourists streaming in. As such, it is recommended that all travel and accommodation be booked well in advance. Expect larger crowds and a general bustle in the air.