How to judge the weather forecast? For example ~ sunny day, rainy day, how many degrees is sunny day? ...

According to the Hong Kong Observatory, the general weather forecast comes from satellite cloud pictures and the monitoring data of some instruments. These data are input into a supercomputer with weather forecasting software installed, and finally the weather forecast is obtained. It is said that the prediction result depends on the computing power of software and computer. It seems that the Hong Kong Observatory spent tens of millions of dollars to buy the latest forecasting software from Japan, and upgraded its supercomputer several years ago to make more accurate forecasts.