It will snow in the evening:
It means that the weather in the evening looks like it is going to snow.
Floating ants don’t know autumn:
Floating ants don’t know autumn is coming. It is said that fly ants live and die in turbulent times, so they do not know the four seasons.
The sentence "It will snow in the evening" comes from
1. Ask Liu Shijiu
Tang Bai Juyi
New fermented wine, green ants A small red clay stove.
It’s snowing in the evening, can you have a drink?
Translation
My newly brewed rice wine has not yet been filtered. There is a layer of green bubbles on the surface of the wine and the aroma is fragrant. A small stove made of red clay for scalding wine is also ready.
The sky is gloomy and it looks like it’s going to snow tonight. Can you stay and have a drink with me?
2. Nan Xiangzi's Winter Night
Qing Chu Hui
The moonlight is pale and silvery. Gusts of wind reached the eaves. It should be late in the day and the sky is snowing, so clean and slender.
The drizzle is like silk but not sticky when frozen.
Added to the Furnace Pavilion. Sitting under an embroidered curtain with a golden mink. The room is filled with spring warmth and coldness, and it is full of red.
Several potted flowers reflect the mirror.