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About the Chinese lunar calendar(农历), there are some solar terms(节气) in winter months: Lidong(the start of winter), Xiaoxue , Daxue, Dongzhi, Xiaohan and Dahan.
Lidong(in November) is the beginning of winter. On this day, after a year of hard work people are happy to have a rest and spend more time with their family. The northern part of China celebrates Lidong as the small Spring Festival. People have dumplings and mutton soup.
Xiaoxue(in November) and Daxue(in December) come after Lidong. During Xiaoxue, northern China can expect snow and temperatures slowly fall below zero degree(度). Daxue means there will be more snow in some places and it will be colder.
When Dongzhi(in December) comes, it brings the shortest day of the year and the longest night. Many places can expect the coldest weather. In ancient(古代的) times, people would say "nine cold periods"(数九寒天) from Dongzhi. Every cold period(时段)has nine days. They believed that after 81 cold days, spring would arrive.
Xiaohan(in January) usually brings the lowest temperature of the year. Finally, during Dahan(in January), the cold weather fills everything with snow. All Chinese people are ready to welcome the Chinese New Year after Dahan. The Spring Festival, China's most important festival, falls at this time.