The temperature this week went up and down like a rollercoaster, didn't it?
The temperature changes were extreme this week, don't you think?
ご質問ありがとうございます。
① "The temperature this week went up and down like a rollercoaster,"＝「今週の気温はジェットコースターみたいに上がったり下がったりだった、」
"didn't it?"＝「だよね？」
② "The temperature changes were extreme this week,"＝「今週の気温の変化は凄かったね、」
"don't you think?"＝「そう思わない？」
ご参考までに。
The temperature really went up and down a lot this week, didn't it?
The temperature was all over the place this week, don't you think?
この場合、次のような言い方ができますよ。
ーThe temperature really went up and down a lot this week, didn't it?
「今週は気温が上がったり下がったりすごかったよね」
ーThe temperature was all over the place this week, don't you think?
「今週は気温が散らばってたよね」＝「気温がバラバラだった」
ご参考まで！
アメリカ合衆国 
カナダ 
