What caused the rain, such as the Wu Guang Uprising in Chen Sheng?

It rained when Zhuge Liang ambushed Sima Yi, so Sima Yi didn't die.

When Xue Yue was fighting in Changsha, the heavy rain slowed down the advance of mechanized troops in Okamura Ningji, and enabled the elite troops of the 10th Army in Li Yutang to mobilize their defense.

At the end of the Ming Dynasty, Chongzhen reigned for six years, and there was no rain and no harvest, followed by six years of rain disaster, which greatly weakened the national strength of the Ming Dynasty and gave the Commissioner Huang Taiji enough time to develop and grow.