It's cool today in the Tokyo area.Temps are only at 13C.
Our idiom for today is hit rock bottom.
This means that someone or something has hit the lowest level of the decline.
Example 1
Consumer sentiment has hit rock bottom since the coronavirus appeared.
Example 2
He knew he had hit rock bottom when he missed his daughters concert because he was hungover. From that point on he stopped drinking and has lived a very good life.