Minecraft wiki entry for Weather, associated text: In older versions of Minecraft, the initial occurrence of inclement weather is predetermined per seed. For example, if the first storm occurs during the second day in one world, and another world is created with the same seed, a storm also occurs during the second day. The average storm lasts 0.5 – 1 day, and there is a 0.5–7.5 day delay between storms. Storms can be skipped entirely with the use of a bed.