People usually say that the weather is sunny and the sky is clear in Wan Li; A sudden drop in temperature means changes in weather, weather and climate.

1. Meteorology refers to all atmospheric physical phenomena such as wind, clouds, rain, snow, frost, dew, rainbow, halo, lightning, thunder and so on.

2. Weather refers to the ever-changing atmospheric state.

3. Climate is the average or statistical state of meteorological elements and weather phenomena for a long time.

So the answer is a weather.

The answer refers to Baidu