"时令" is the ancient Chinese people, according to the laws of climate change, create a weather report. Ancient Chinese people every season is divided into 3-4 small season.The small season is "时令".Every little season can guide people to engage in a particular agricultural activities, or cultural activities. "时令" is now rarely used, one commonly used is the internationally accepted "季节"

时令 目录 时令 详细解释 时令习俗 时令蔬菜 时令 　　【词语】：时令 　　【注音】：shí lìng 　　【释义】： 　　1.犹月令。古时按季节制定有关农事的政令。 　　2.季节。 　　3.方言。时令病。 　　4.图书分类目录名。宋以前有关时令的书籍，都入子部农家，但诸书所载，上自国家典制，下至民间风俗，不仅 仅限于农事，故《中兴馆阁书目》，另列时令一类。清代修《四库全书》，沿用宋人旧例，仍立时令一目。

季节<中文>=season<english>=stagione<italiano>

时令 and 季节: same meaning in the dictionary. But 时令 from ancient times.

时令 means season, and 时节 means '节令' and season. 节令 means the climates and the connection between animals' behaviors and the climaties in certain '节气'. finaly, （二十四）节气 is a system created by the antien Chineses, which shows the climates changing and plays a important role in Chinese traditional agriculture. i hope i've made it clear:)