One describing the snow scene, the other describing the rain scene. What is their common role in the novel?

The first paragraph: Lin Chong stepped on the auspicious snow, facing the north wind, as if flying to the gate of the meadow. When he opened the lock and looked inside, he only cried out bitterly. It turns out that heaven is clear and protects good people and righteous people. Because of this heavy snow, Lin Chong's life was saved. The two grass halls had been crushed by the snow. "What should I do?" Lin Chong wondered. Putting down the flower spear and gourd in the snow, he was afraid that there would be charcoal burning in the brazier. When he moved away the broken wall and stretched his body in to touch it, the fire in the brazier had been extinguished by the snow water. When Chong Lin touched the bed, he only pulled a quilt. Lin Chong came out and saw that the sky was dark. "There's no place to start a fire," he thought."How can I arrange it?" He remembered,"Half a mile from here, there's an old temple where you can settle down." I'll go there for the night. Wait until dawn, then we'll deal with it." He rolled up the quilt, picked up the wine gourd, locked the door, and looked into the temple. After entering the temple, he closed the door again. There was a big stone beside the door. He pulled it over and leaned it against the door. The second paragraph: Another gust of wind, stronger than before, willow branches flying horizontally, dust moving in all directions, rain falling down; Wind, earth, rain, mixed together, forming a piece, horizontal and vertical gray and cold, everything was wrapped in it, unable to distinguish which was the tree, which was the ground, which was the cloud, all directions were chaotic, all loud, all confused. The wind passed, leaving only a straight path of rain. The rain fell from the sky and the earth. It was impossible to see the rain clearly. There was only one area. In a moment, countless arrows shot from the ground and thousands of waterfalls fell from the houses. A few minutes later, the world was inseparable. The river in the sky fell, and the river on the ground flowed. It became a gray, yellow, and sometimes white world of water.