This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Note that 四 is read using the on'yomi reading, which you've seen a few times over the course of WaniKani. Think of し meaning "death" (like 死), and how with the four seasons there comes death every Fall and Winter.
The photos Viet took depict the beauty of the four seasons very well.
My younger brother used to wear Japanese geta all year round.
Can you tell me about Japan’s four seasons and what people do and eat during them?