In the spring days the warmth returns; the orioles begin to call.
诗经 · 七月· our translation
The first line of spring in an agricultural calendar: warmth returning, birds calling. 春 in a name is that return, not a calendar entry.
《七月》写农事历，这是春天开始的那一句：太阳回暖，黄鸟开叫。名字里的「春」是这一层——不是季节名，是回暖。