Rain: Rainy Season in Palestine is in the Ninth Month, Corresponding to December
Source: Nav
Ezra 10:9, 13
So within the three days, all the men of Judah and Benjamin assembled in Jerusalem, and on the twentieth day of the ninth month, all the people sat in the square at the house of God, trembling regarding this matter and because of the heavy rain. / But there are many people here, and it is the rainy season. We are not able to stay out in the open. Nor is this the work of one or two days, for we have transgressed greatly in this matter.