December is the beginning of the winter season.
The average high temperatures are around 15°C (about 59°F) reaching highs on average of 21°C (70°F) and dropping to an average minimum temperature of 8°C (46°F).
During the winter, nights can get quite chilly, generally dipping to the freezing temperature, so make sure you have warm clothes with you, including thermals and potentially a blacket or thick sleeping bag.
It is advisable to make sure that your hotel provides you with a heater in the room.
Moreover, December in Kathmandu also receives 8 to 9 hours of sunshine daily on average throughout the month.
The visibility during this month is quite good as well, and, as a result the trekking enthusiasts are around in Kathmandu.
This period is also ideal for hiking and walking tours as the visibility is better than at other times of the year and there is not the same expectancy of rain as at other times of the year.
