강수량이 적은 겨울철과 봄철에 선형 상관성이 상대적으로 높았으며, 7월부터 9월까지 강수량이 많아질수록 선형 상관성은 나타나지 않았다.
Linear correlation was relatively high in winter and spring, when precipitation was low, and linear correlation was not seen as precipitation increased from July to September.