Note - Rainfall amounts were so light that any pattern was most likely nothing more than an anomaly, and probably of no use to this experiment, but all data should at least be mentioned . The opposite is true as air descends. It is dried out and precipitation loses some of its intensity. Mountains force air to rise and fall. Simply stated, the rain shadow effect is caused by air warming up and losing its moisture after it passes over mountains.
Wind is the main variable.
Without wind, there would be no rain shadow effect. There are two major effects of wind. First of all, the wind pushes the air against the mountains, causing it to rise and then fall on the other side, which means more precipitation in the mountains and less in the valleys. If that is the only effect the wind has, the rain patterns should be fairly uniform, and proportional with different storms of different magnitudes. There is, however, a second effect the wind has.