What do the symbols stormy weather, nature, fire, books, celestial bodies, and day and night represent?

Each of your items represents something different. Shelley often uses weather to foreshadow future events. William's murder takes place during a stormy night, Victor's wedding is accompanied by a storm, and Elizabeth loses her life. Nature, beauty and fine weather contribute to both Victor's and the monster's sense of contentment and ease. In other words, the weather directly contributes to the way the characters feel. You need to submit each of your other items in a separate question.