What do you mean July is like fire?

Filariasis in July means: the weather is getting cold.

"July" refers to July in the summer calendar, that is, July in the lunar calendar today, which is roughly equivalent to August in the Gregorian calendar.

"Flow" means moving and falling.

"Fire", the name of the star, refers to the great Mars, that is, Antares. Every year in the summer calendar, at dusk in May, the heart is in the sky, and it gradually goes west after June. The heat in summer began to subside. So it is called "filariasis". The ancients found that Mars gradually moved westward and the weather began to get cold when it set.

The "fire" referred to here is not the weather like fire, but the name of a star, which is Scorpio α. It is the brightest star in Scorpio, emitting lux light, so ancient astronomy in China called it "fire" star, also called antares.