seasonal

Farmers often hire seasonal workers to assist with the grape harvest every September.

(Chinese) 农民经常在每年九月雇用季节性工人来协助葡萄采收。

The ice cream shop closed for the winter because their business is entirely seasonal.

(Chinese) 这家冰淇淋店冬天关门了，因为他们的生意完全是季节性的。