Story Identification: science fiction/fantasy, short story for high school English class

I read a short story in English class around 1998-2001. The main character was a girl named Margot. The setting was a settlement on another planet - maybe Jupiter or Mars? The planet was excessively rainy, and the sun shone once every few years (i don't remember how many years). Among her classmates, Margot was the only one who talked about the sun and what it was like - warm, bright, shiny, etc. - but the other kids didn't believe her. It was hinted Margot may have lived on Earth, and that's why she knew what the sun was like, but most of the kids had lived their entire lives on this other planet, so that's why they didn't believe any of it. On the day the sun was going to shine, the kids tricked Margot and locked her in a closet. At the time of the sun glimpse, the kids filed outside to watch, forgetting about Margot. They enjoyed their time outside in the brief glimpse of sun, and then suddenly remembered Margot. Humbly they let her out of the closet to face x number of years before the next sun viewing.