Hortan plains

The second & third highest mountains of the country namely Kirigalpotta & Thotupola respectively are found within the borders of the park. Park receives rainfall from both northeast & southwest monsoons as well as inter-monsoonal rains. Frequently occurring mist and clouds are one main source of precipitation. With annual precipitation of about 5000mm Horton Plains is the most important catchments area of the country. Three major rivers of the country start from this area namely Kelani, Walawe & the Mahaweli the longest river of the country. There is a slight dry period between January to March. Due to altitude the area is comparatively cold. Mean annual temperature is around 15' C and during colder months it will go down further where it is cold enough to create ground frost.