Nepal experiences 4 seasons :
spring (Mar - May),
summer (Jun - Aug),
autumn (Sep - Nov) and
winter (Dec - Feb).

The climate is varied ranging from the sub-tropical Terai to the cool dry temperate and alpine climate in the northern Himalayan ranges. In the Terai, the hottest part of the country, summer temperatures may rise as high as 40°C. The climate is hot and humid. In the midmountain region, the summer climate is mild with temperatures around 25°C - 27°C.

The winter temperatures range from 7°C to 23°C in the Terai and subzero to 12°C in the mountain regions and valleys. The northern Himalayan region has an alpine climate. The valley of Kathmandu has a pleasant equable climate with average summer and winter temperatures of 19°C - 27°C and 2°C - 12°C respectively.