What is wrong with いきなり涼しくなった While talking about the weather, I said: > My interlocutor corrected me: > I would like to understand what makes inappropriate to avoid making the same kind of mistake again. I have found that the following sentences are correct even though they look quite similar to to me: > > > > > I have read this, but it did not help me understand when _not_ to use .

is not terribly wrong, but tends to express a truly instant event that occurs all of a sudden. If I understand the context correctly, you are describing a phenomenon that progresses over a few days, so sounds more natural. But if you have unexpectedly entered a cold room, saying is equally natural.

As the linked question says, also carries the nuance of subjective unexpectedness or mental unpreparedness, but this difference is not important now.