What month does fireworks March refer to?

There is a poem in the famous poet Li Bai's "Yellow Crane Tower Farewell to Meng Haoran in Yangzhou": "An old friend left the Yellow Crane Tower in the west, and fireworks went down to Yangzhou in March".

One of the four seasons. As far as solar terms are concerned, spring begins in the beginning of spring (February 2-5) and ends in the long summer (May 5-7). In Europe and America, spring begins at the vernal equinox in China and ends at the summer solstice. In Ireland, February to April is designated as spring. Meteorologists have established a standard for dividing the four seasons as close as possible to the natural scene. Taking the five-day average temperature as the standard, the five-day average temperature after winter passes 10℃ and begins to enter spring. When the temperature is higher than 22℃, it means the end of spring and the beginning of summer.

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"Fireworks descend in Yangzhou in March", and the word "fireworks" was added to "March", smearing the atmosphere of that poem in the farewell environment. Fireworks refer to misty smoke and flowers. The reader's feeling is by no means a piece of land or a flower, but an invisible and impenetrable smoke cloud in spring. March is the season of fireworks, and the prosperous lower reaches of the Yangtze River in Kaiyuan era is the place of fireworks.

Fireworks in March not only reproduces the charming scenery of the bustling place in late spring, but also reveals the flavor of the times. This sentence has a beautiful artistic conception and a beautiful writing style, and Sun Zhu of A Qing Dynasty praised it as "the eternal quatrain". Li Bai's desire to go to Yangzhou is beyond words.