While Keats praises fall in his poem, the tone is also a little sad. He emphasizes the fact that fall is a period of death. Line 25 of the third stanza begins, "While barred clouds blossom the soft-dying day." The poem's tone is mellow and leisurely, with rich descriptions of autumn's splendor. Then it becomes more emotional as he expresses his love for Autumn. During autumn, the weather can be very changeable. It can be hot one minute and cold the next. This is because there are strong winds coming from the south that carry cool air from Canada down into North America. These are called "zephyrs" and they make life feel warmer at home or on campus. Autumn also signals the beginning of winter. When it gets colder outside, people need to prepare themselves for the change by putting away their summer clothes and buying coats and gloves. The color of autumn varies depending on where you live. In some places, such as California, Arizona, and Texas, the leaves will stay green all through fall. But in other parts of the country, such as New York State and Michigan, they'll turn yellow, orange, and red. In general, autumn is a time when the weather is changing and plants are preparing themselves for winter. This is why scientists say that autumn is a season of transition.