成都提前18天入春

Group 1 - The article discusses the early arrival of spring in Chengdu, with the city officially entering spring on February 13, which is 18 days earlier than the average date and the fourth earliest since 2000 [1] - The average temperature in Chengdu for March is predicted to be 13.5°C, which is 0.9°C higher than the historical average for the same period [1] - There is a forecast for a significant drop in temperature towards the end of March, indicating a potential for a late cold snap, commonly referred to as "倒春寒" [1]