How to write the weather description of 15 degrees?

The weather description of this temperature is as follows:

1 and 15 degrees in spring, the spring breeze is warm, the sky is as clear as a piece of blue paper, and a few thin white clouds float slowly with the wind, as if melted by the sun.

2. Just after 4 pm, the temperature dropped from 20 degrees at noon to 15 degrees, and the sun couldn't wait to put away its faint light, as if afraid of the cold, and hid in the clouds as thick as cotton tires.

3. It's gray, and it's still chilly in the early morning of 15 degrees. The grass bowed its head and the branches twisted and looked up, gloomy. I didn't expect the rain to fall quietly