あの夏は雷が多かった。

あの夏は雷が多かった。

We had a lot of thunder that summer.

あの夏(なつ)は雷(かみなり)が多(おお)かった。

Ano natsu wa kaminari ga ōkatta.

彼の (あの、かの)

that (someone or something distant from both speaker and listener, or situation unfamiliar to both speaker and listener)

夏 (なつ)

summer

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

雷 (かみなり、いかずち、いかづち、らい)

lightning; thunder; thunderbolt; god of thunder; god of lightning; anger; fit of anger

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

多い (おおい)

many; numerous

Readings: カ、ガ、ゲ、なつ

Meaning: summer

Readings: ライ、かみなり、いかずち、いかづち

Meanings: thunder, lightning bolt

Readings: タ、おお.い、まさ.に、まさ.る

Meanings: many, frequent, much