Nepal is organised in four climatic seasons: the Spring from March to May, the Summer from June to August, the Autumn from September to November and the Winter from December to February.The year is divided in two typical seasons: the monsoon or wet season runs from June to September and the dry season runs from October to May.During the monsoon, about 80% of the rain falls. This remains that the rest of the year is dry. This period is very important for agriculture.Summer temperatures range from 28oC in the hill regions to more than 40oC in the Terai.
The best moments to visit Nepal are Autumn and Spring in the dry season. When the monsoon ends, the countryside is green and lush and the clear weather allows to see the Himalayas from many places in the country. The Spring comes just after the Winter, the temperatures are still cool and the sun is always present.
During Winter temperatures can drop to freezing in some places. In Kathmandu Valley (1300 m), the temperatures range from 2 to 20oC.Since the last years, Nepal observes sometimes early monsoon and sometimes late monsoon. This causes a big problem for the crops and the stock of food for the rest of the year.Moreover, year after year temperatures become higher and higher. There is less snow on the mountains and some rivers, dependant upon the melted snow, are totally dry during the dry season.Definitely Nepal is victim of the Global Warming.