How does Dickens use weather in A Christmas Carol to create mood?

Answer:

When the story opens, the narrator describes gloomy, foggy weather: "it was cold, bleak, biting weather: foggy withal." This dark atmosphere mirrors Ebenezer Scrooge's mood. Just a few sentences before, Scrooge is described as a carrying "his own low temperature always about with him; he iced his office in the dog-days; and didn't thaw it one degree at Christmas." While Scrooge "humbugs" his way through the holidays, the weather is equally dour. After Scrooge's transformation, descriptions of the weather change alongside descriptions of Scrooge's soul. When Scrooge is happy, or "light as a feather," the weather is described as "no fog, no mist; clear, bright, jovial, stirring ... piping for the blood to dance to." Now that Scrooge is excited and engaged in the world around him, the weather follows suit.