The Climate Of Arunachal Pradesh Varies With Elevation. Areas That Are At A Very High Elevation In The Upper Himalaya Close To The Tibetan Border Have An Alpine Or Tundra Climate. Below The Upper Himalayas Are The Middle Himalayas, Where People Experience A Temperate Climate. Areas At The Sub-Himalayan And Sea-Level Elevation Generally Experience Humid, Sub-Tropical Climate With Hot Summers And Mild Winters.

Arunachal Pradesh Receives Heavy Rainfall Of 2,000 To 4,100 Millimetres (79 To 161 In) Annually, Most Of It Between May And September. The Mountain Slopes And Hills Are Covered With Alpine, Temperate, And Subtropical Forests Of Dwarf Rhododendron, Oak, Pine, Maple, Fir, And Juniper, Sal (Shorea Robusta) And Teak Are The Main Economically Valuable Species.