The first rains begin from the middle of October, the major falls are in December-January, while some rain is still expected in March and April.
Different areas receive very different annual falls.
The hill country and parts of Trans-Jordan have annual figures over 600mm, while the Negev and around the Dead Sea get less than 100mm. Dew is also of major importance, with many areas receiving as much moisture from this as from rain. River and Wadi Water is vital in dry country like Palestine. In that context much of the use of water as symbol of life and sign of divine providence makes sense. As a deer longs for flowing streams, so my soul longs for you, O God.