It seems like as soon as summer ends in Japan these days, the winter season settles in quite quickly.
These last few years in Japan, the summer has ended and the temperature has dropped quite quickly leading to winter.
ーIt seems like as soon as summer ends in Japan these days, the winter season settles in quite quickly.
「最近、日本では夏が終わるとすぐ冬が素早くやってくるようだ」
as soon as summer ends で「夏が終わるとすぐ」
to settle in で「(季節などが）やってくる」
ーThese last few years in Japan, the summer has ended and the temperature has dropped quite quickly leading to winter.
「ここ数年日本では、夏が終わると気温がすぐ下がり冬がやってくる」
temperature で「気温」
to drop で「（温度が）下がる」
to lead to ... で「きたす・つながる」
ご参考まで！
カナダ 
