On that day in June, the child's face expressed the meaning of change.

The child's face, that is, his feelings change quickly, he cried in an instant, and then smiled, indicating that he is moody and changeable. This day in June means that the weather is changeable.

The changeable weather in June is a good proverb, which is used not only to describe the changeable weather, but also to describe people's moodiness.

The changeable weather in June is caused by the constant convergence of cold and warm air. Entering summer in June, the weather is getting hotter and hotter, and the influence of warm air is constantly strengthening. However, the influence of cold air still exists in June. With the meeting of cold and warm air again and again, the changeable weather in most parts of the country is caused, just like the phenomenon that the temperature in many areas was below 30 degrees 15 some time ago, which is the embodiment of the changeable weather in June.

Extended data:

From the17th century, scientists began to use scientific instruments (such as barometer) to measure weather conditions and use these data to make weather forecasts. But for a long time, people can only use local meteorological data to make weather forecast, because at that time, people can't transmit the data to a distant place quickly. 1837 after the invention of the telegraph, people were able to make use of large-scale meteorological data for weather forecast.

Meteorology developed rapidly in the 20th century. People's understanding of atmospheric processes is becoming clearer and clearer. Digital weather forecast appeared and developed rapidly with the development of computer hardware in1970s. Today, it has become the most important weather forecast method.