![]() The length of the astronomical seasons varies between 89 and 93 days, while the length of the meteorological seasons is less variable and is fixed at 90 days for winter in a non-leap year (91 days in a leap year), 92 days for spring and summer, and 91 days for autumn. It is important for them to be able to compare the same period of time in different years. Meteorologists, on the other hand, define seasons based on climatic conditions and the annual temperature cycle. To find out the exact date and time of summer 2023 in your area use this seasons calculator. For locations that are ahead of UTC (further east) it may fall on the day after, and for locations that are behind UTC (further west) it may fall on the day before. While summer starts and ends at the same moment in time all over the Northern Hemisphere, the date and local time differ from place to place depending on the year and a location's time zone. The start and end dates for summer given on this page are the dates of astronomical summer in the Northern Hemisphere and are based on Coordinated Universal Time (UTC), which for practical purposes is equivalent to Greenwich Mean Time (GMT - the time zone of the United Kingdom). In the Southern Hemisphere summer lasts from the December solstice (December 20 to 23) to the March equinox (March 19 to 21). Summer ends and autumn starts at the moment of the September equinox, which occurs every year between September 21 and 24. In the Northern Hemisphere spring ends and summer starts at the moment of the June solstice, which occurs every year between June 20 and June 22. In the astronomical calendar the start and end dates of summer are based on the changing position of Earth in relation to the sun and the resulting solar events of equinoxes and solstices. ![]() Astronomical and meteorological summer start and end on different dates. ![]() The two most commonly used ones are based on the astronomical calendar and the meteorological calendar. There are various ways to define the start and end dates of summer. ![]() It is the warmest time of the year and falls between spring and autumn ( fall), the intervening periods that lead from and to winter, the coldest time of the year.Īstronomical summer vs. Whether you’re celebrating spring or autumn, the March equinox represents an interesting moment in our latest journey around the sun.Summer is one of the four seasons that make up the year. Solstice derives from the Latin solstitium, which literally means “the standing still of the sun.” The solstice occurs around June 21 and December 22. So what about the beginning of summer and winter? Well, the equinox is often confused with the solstice, which is either of the two times a year when the sun is at its greatest distance from the celestial equator. The equinox has inspired a number of interesting false beliefs, including that the event causes a massive disruption of communication satellites, or that on the equinox an egg can effortlessly be balanced on its end (egg balancing is a skill you can practice any day of the year). After all, in the southern hemisphere, March represents the beginning of autumn and spring comes along in September! But if you want to be truly egalitarian, opt for saying March equinox and September equinox instead. The autumnal equinox occurs around September 22nd, when the sun crosses the celestial equator going south. In the northern hemisphere, the spring, or vernal equinox happens around March 21, when the sun moves north across the celestial equator. The word equinoxcomes from Latin and means “equality of night and day.” So, the equinox occurs at two specific moments in time when the sun is exactly above the equator (contrary to popular belief, the equinox doesn’t last for 24 hours). But what exactly is the spring equinox? And does an equinox happen at the start of every season?įirst, let’s get into the equinox, which actually occurs just twice a year. We get pretty excited about the spring equinox bringing us out of winter and officially starting the season of spring.
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