why does he weather changes so frequently?
Weather refers to the state of the atmosphere at any point of time and place. It may vary at intervals of a few hours or a few days. This is because weather is controlled by various factors like
(i) Humidity: The amount of moisture present in air
(ii) Temperature: The degree of hotness or coldness of an environment
(iii) Rainfall: The quantity of rain in a given period of time
(iv) Wind speed: The speed of wind blowing over a place in km per hour
As any of the factors controlling weather change, the weather changes.