As the saying goes: Lesser Cold is actually colder than Greater Cold.
Tips
culture
23rd of the 24 solar terms, around January 5-6. Paired with 大寒 (Greater Cold) as the final pair. In practice 小寒 is often colder than 大寒 in northern China, hence the proverb 小寒胜大寒.
usage
The 小/大 (lesser/greater) pattern also marks 小暑/大暑 (Lesser/Greater Heat) and 小雪/大雪 (Lesser/Greater Snow) — each pair straddles the extreme point of a season.