这个我也知道。常在外面的人知道这些很有用。加州缺水，多下点雨有帮助

https://www.loc.gov/everyday-mysteries/meteorology-climatology/item/is-the-old-adage-red-sky-at-night-sailors-delight-red-sky-in-morning-sailors-warning-true-or-is-it-just-an-old-wives-tale/