i once summon rain, and it work but it will take about half an hour or night fall. The longer the time is the bigger the rain is. And then i try to summon the wind it work but i have to use my voice. What does that mean ? am i able to control the wind or water, or is it just my illusion
Urlic is right. You cannot to my knowledge controll the elements. Most likely your subconscious was picking up on subtle hints that it was about to rain. This made you think about rain and attempt to summon it. If you feel an affinity to water you might like to try using it in meditation. The sounds or feel of water can be very soothing and help you to achieve a meditational state
While you can't control the weather, if the environment needs it I've found you can ask for rain or sunlight. You have no control over if it will rain or not, but weather spirits/deities will be more willing to help if you don't "summon" the weather.
You most definitely can not control the elements themselves.
Like the previous people have said, you cannot control the elements. The correct term would be manipulation. You can most definitely manipulate an element in your favor but that is it. There is no sure way it will go your way even then.