It is literally impossible to control weather.
You may call upon deities and ASK for rain,which is different entirley,
but a human can not control weather,
Its the same thing as thinking you can do a spell to turn into a vampire.
You foolishly believe that you can use nothing but the brain (which can not extend to the oustide world to manipulate matierial objects) to control something beyond you power.
Even if it were possible to do such a ludicrous thing,the sheer amount of power needed to complete the task would probably cause major brain damage.