The park is located in the eastern climatic zone of the Himalayas, where monsoon starts in June and eases off in late September. During these months about 70% of the annual precipitation of falls. The first monsoon clouds reach the area in April. Temperatures vary greatly due to the extreme difference in altitude in the entire area. Lower elevations are temperate throughout winter and hot during April and May. The tropical and subtropical zones are frost free, with average monthly mean temperatures above .