Nepal has 5 seasons: summer, monsoon, autumn, winter and spring and has five climatic zones. I will be there during winter and will be hiking through several climatic zones as I will be going down into valleys and up into the mountains.
The temperature will fluctuate between 25F and 70F. In the higher altitude sections of the trail, it will be between 25F and 45F.
The coldest time will be at night at the tea houses as most of the houses do not have heat.Namaste!