Spring (March to April)

Weather: Mild and pleasant, with blooming flowers and vibrant greenery.

Highlights: Ideal for sightseeing and exploring the region's natural beauty. The Kaziranga National Park in Assam is perfect for wildlife spotting during this time.

Summer (May to June)

Weather: Warm, but cooler compared to other parts of India. Higher altitudes offer a pleasant escape from the heat.

Highlights: A great time to visit hill stations like Shillong (Meghalaya) and Gangtok (Sikkim). The Tawang Festival in Arunachal Pradesh showcases local culture and traditions.

Monsoon (July to September)

Weather: Heavy rainfall, which can lead to landslides and flooding in some areas.

Highlights: The landscape becomes lush and verdant, making it a picturesque time for photography. However, travel can be challenging due to road conditions.

Autumn (October to November)

Weather: Clear skies and comfortable temperatures. Post-monsoon greenery and waterfalls are at their best.

Highlights: This is considered one of the best times to visit. Festivals like Durga Puja in Assam and Manipur, and the Wangala Festival in Meghalaya, offer a glimpse into the local culture.

Winter (December to February)

Weather: Cold, especially in higher altitudes, but still manageable.

Highlights: Perfect for experiencing snowfall in places like Tawang (Arunachal Pradesh) and Pelling (Sikkim). The Hornbill Festival in Nagaland during December is a major cultural event.

Summary

Best Overall Season: Autumn (October to November) for its pleasant weather and vibrant festivals.

For Wildlife Enthusiasts: Spring (March to April) for wildlife spotting and blooming flora.

For Adventure Seekers: Summer (May to June) for trekking and exploring hill stations.