Which solar term is the period with the least rain in a year?

Slight cold and severe cold are the periods with the least rainfall in a year. In the cold solar terms all the year round, the rainfall in most parts of southern China only increased slightly compared with the previous period, with 5 ~10mm in most parts of southern China and only1~ 5mm in mountainous areas of northwest plateau. During the winter drought in South China, the water consumption is small, and the contradiction between supply and demand of farmland water is generally not prominent. However, "if you are bitter and cold, don't complain about the rain and snow. Snow is reserved for next year's wheat." In the case of scarce rain and snow, it is undoubtedly beneficial to the growth of wheat crops to water in different areas according to different farming habits and conditions.