The answer is it depends upon the time you are travelling in North Bengal. If your travel time is between summer seasons, moderate cloth will be fine, but if you are traveling between December to first half of March, please carry adequate warm and woolen cloth as it become too much cold during night. The temperature can come down to 8 to 15 degree. Now, if you are travelling in off season period i.e. between July to September, do not forget carry rain coat and umbrella.