Understanding the seasonal calendar in the US can help you plan better for outdoor activities, wardrobe changes, and even business strategies. 1. What Are the Seasons in the US? The US observes four main seasons, each defined by the Earth’s tilt and orbit around the sun. Here are their official start and end dates, based on astronomical timing: Use our Seasons Calculator to see exact times and dates for spring, summer, fall, and winter in your city. The year is commonly divided into four seasons: spring, summer, fall (or autumn), and winter. Because we divide a year into 12 months, each season lasts about three months. Meteorologically seasons are quarters of the annual temperature cycle, [1] centered on the season characteristic temperatures, which trail equinox and solstice. A season is a division of the year [2] based on changes in weather, ecology, and the number of daylight hours in a given region. Exact time and date of the September equinox and other seasons. When is the first day of Autumn and when does each season start. Watch here when spring, summer, autumn and winter begins and ends. Both the Astronomical and Meteorological seasons are listed here. For related background details, please refer to our report on stihl 500i parts diagram. Seasons and Dates in the US: A Complete Guide to Weather Changes Across ... Seasons begin and end on different dates in different countries. The summer solstice is the longest day of the year, and the winter solstice is the shortest. The equinox is the time when the day and the night are the same number of hours, assuming the sun were a point of light at its center.

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