Does the original meaning of "July fire" mean that the weather turns cold?

Literally, it is easy to understand that the sun in July is like a fire and the air is like a flame, which makes people suffer in the summer heat. In fact, this understanding is wrong. This idiom belongs to misinformation and misuse in most cases.

"Fire in July" was originally a poem in the Book of Songs: fire in July, clothes in September. Its main idea is that whenever a star named "fire" appears in the western sky at dusk in July of the lunar calendar, the summer heat will begin to fade, and it will be cold in September, so you should wear more clothes. It is important to point out here that this star named "Fire" is not Mars.

It can be seen that "July filariasis" does not mean the hottest dog days at all, but refers to the season when the weather gradually turns cold. Therefore, it is wrong to use "July fire" to describe high temperature weather.