What kind of weather makes people feel very sad?

The weather is gray, cloudy and cold. The sidewalks on both sides of Chang 'an Avenue are crowded with men, women and children. The road is so long and there are so many people that you can't see the east end and the west end. People are all wrapped in black gauze on their arms and white flowers on their chests, and their eyes are all looking at the direction where Premier Zhou's hearse will come. An old woman with silver hair leaned against a locust tree on crutches and waited anxiously and patiently. A young couple, husband holding his little daughter, wife holding their six or seven-year-old son, squeezed off the sidewalk and looked around. A group of tearful red scarves, arm in arm with each other, stood on tiptoe and looked at each other. ...

Night began to fall. After several leading cars passed by, the Prime Minister's hearse came slowly. Black and yellow paddles hung around the hearse, decorated with big white flowers, which were solemn. People feel sad, and their eyes move with the hearse. It seems that someone is silently conducting. Old people, young people and children all stood up straight, took off their hats and looked at the hearse helplessly, crying, without wiping away the tears on their cheeks.

On this ten-mile long street, Premier Zhou sent away many international friends from five continents and four seas, and accompanied Chairman Mao to inspect the people many times. People often see Premier Zhou happily, and see his strong physique and kind face. Today, however, he is quietly lying in the hearse, farther and farther away, saying goodbye to us!

The hearse moves slowly, affecting the hearts of thousands of people. Many people chased the hearse on the sidewalk. How people wish the car could stop and time could stop! But the hearse faded away and finally disappeared into the boundless night. People still stood quietly with their backs to the direction of the hearse, as if waiting for Premier Zhou to come back.