December is the coldest and driest month of the year, the temperature in the month decreases dramatically to 18- 19ºC and the nighttime temperature can drop below 11ºC with dry climate. The day is very short and become dark very soom (about 5:30 pm). As people from South East Asia, you must be familiar with this climate especially Vietnamese, so bring your warm clothes and a scarf that will help you. less cold. Monthly average temperature: 18ºC, average high temperature is 22ºC, average low temperature is 140C with 67% humidity. Rain is less, but it feels cold and chilly.