'In hot weather tea refreshes you by gently raising the body temperature momentarily, causing mild perspiration, which cools the skin. This is why in India, where temperatures are currently between 38C and 40C, people are queuing up to enjoy a refreshing drink of tea!'
My dad has always said this and will not hear anything against it.
Fortunately my mother is a doctor and she knows the scientific laws that govern body temperature. As a result she has taught me that the best way to keep cool in the hot wheather is to wear as many clothes as you can (to keep the hot out), and to drink lots of beer (because it is cold). It is also very important to wear black clothes because the sun can't see black.
It has never seemed to work for me though