Assam has four well defined seasons in a year.......summer, monsoon, winter and spring which present Assam in different moods. The state experiences high rainfall and humidity as it has bounteous forest cover almost through it's length and breadth.
The National Parks and sanctuaries are closed for monsoons between June and September.
Bihu, the most important festival of Assam is celebrated three times a year but the most lavish celebrations happen during Rongali Bihu (mid- April) when the entire state erupts in festivities making it a good time for tourists to visit the state.
Assam enjoys tempertate weather with a maximum of 35 - 38 C in summer and a minimum of 6 - 8 C in winter in low lying areas, particularly the Brahmaputra and Barak Valley. However, as one ascends towards the hills, the mercury drops considerably in winters.