How accurate is the weather forecast for a region 15 days?

Weather forecast is usually divided into three types: short-term weather forecast (2 ~ 3 days), medium-term weather forecast (4 ~ 9 days) and long-term weather forecast (10 ~ 15 days or more). As far as the current weather forecast is concerned, the accuracy of short-term weather forecast is very high, but it is only high, and it cannot reach the accuracy of 100%. Not to mention the weather forecast for the next 15 days.

In fact, it is good to know about the medium and long-term weather forecast published by some meteorological websites. If you want to know more accurately, it is suggested to pay attention to the short-term weather forecast issued by the meteorological observatory.