Summer is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer solstice, daylight hours are longest and darkness hours are shortest, with day length decreasing as the season progresses after the solstice. The earliest sunrises and latest sunsets also occur near the date of the solstice. The date of the beginning of summer varies according to climate, tradition, and culture. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere, and vice versa.

From an astronomical view, the equinoxes and solstices would be the middle of the respective seasons,[1][2] but sometimes astronomical summer is defined as starting at the solstice, the time of maximal insolation, often identified with 21 June or 21 December. By solar reckoning, summer instead starts on May Day and the summer solstice is Midsummer. A variable seasonal lag means that the meteorological centre of the season, which is based on average temperature patterns, occurs several weeks after the time of maximal insolation.[3]


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The meteorological convention is to define summer as comprising the months of June, July, and August in the northern hemisphere and the months of December, January, and February in the southern hemisphere.[4][5] Under meteorological definitions, all seasons are arbitrarily set to start at the beginning of a calendar month and end at the end of a month.[4] This meteorological definition of summer also aligns with the commonly viewed notion of summer as the season with the longest (and warmest) days of the year, in which daylight predominates.

The meteorological reckoning of seasons is used in countries including Australia, New Zealand, Austria, Denmark, Russia and Japan. It is also used by many people in the United Kingdom and Canada. In Ireland, the summer months according to the national meteorological service, Met ireann, are June, July and August. By the Irish calendar, summer begins on 1 May (Beltane) and ends on 31 July (Lughnasadh).[citation needed]

Days continue to lengthen from equinox to solstice and summer days progressively shorten after the solstice, so meteorological summer encompasses the build-up to the longest day and a diminishing thereafter, with summer having many more hours of daylight than spring. Reckoning by hours of daylight alone, summer solstice marks the midpoint, not the beginning, of the seasons. Midsummer takes place over the shortest night of the year, which is the summer solstice, or on a nearby date that varies with tradition.

Where a seasonal lag of half a season or more is common, reckoning based on astronomical markers is shifted half a season.[6] By this method, in North America, summer is the period from the summer solstice (usually 20 or 21 June in the Northern Hemisphere) to the autumn equinox.[7][8][9]

Reckoning by cultural festivals, the summer season in the United States is traditionally regarded as beginning on Memorial Day weekend (the last weekend in May) and ending on Labor Day (the first Monday in September), more closely in line with the meteorological definition for the parts of the country that have four-season weather. The similar Canadian tradition starts summer on Victoria Day one week prior (although summer conditions vary widely across Canada's expansive territory) and ends, as in the United States, on Labour Day.

In some Southern Hemisphere countries such as Brazil, Argentina, South Africa, Australia and New Zealand, summer is associated with the Christmas and New Year holidays. Many families take extended holidays for two or three weeks or longer during summer.

In Chinese astronomy, summer starts on or around 5 May, with the jiq (solar term) known as lxi (), i.e. "establishment of summer".[10][11] Summer ends around 7 August, with the solar term of lqi (, "establishment of autumn").

In southern and southeast Asia, where the monsoon occurs, summer is more generally defined as lasting from March, April, May and June, the warmest time of the year, ending with the onset of the monsoon rains.[citation needed]

Because the temperature lag is shorter in the oceanic temperate southern hemisphere,[12] most countries in this region use the meteorological definition with summer starting on 1 December and ending on the last day of February.[13][14]

Thunderstorm season in the United States and Canada runs in the spring through summer but sometimes can run as late as October or even November in the fall. These storms can produce hail, strong winds and tornadoes, usually during the afternoon and evening.

Schools and universities typically have a summer break to take advantage of the warmer weather and longer days. In almost all countries, children are out of school during this time of year for summer break, although dates vary. Many families will take holidays for a week or two over summer, particularly in Southern Hemisphere Western countries with statutory Christmas and New Year holidays.

In England and Wales, school ends in mid-July and resumes again in early September. In Scotland, the summer holiday begins in late June and ends in mid-to late-August. Similarly, in Canada the summer holiday starts on the last or second-last Friday in June and ends in late August or on the first Tuesday of September, with the exception of when that date falls before Labour Day, in which case, ends on the second Tuesday of the month. In Russia the summer holiday begins at the end of May and ends on 31 August.

In the Southern Hemisphere, school summer holiday dates include the major holidays of Christmas and New Year's Day. School summer holidays in Australia, New Zealand and South Africa begin in early December and end in early February, with dates varying between states. In South Africa, the new school year usually starts during the second week of January, thus aligning the academic year with the Calendar year. In India, school ends in late April and resumes in early or mid-June. In Cameroon and Nigeria, schools usually finish for summer vacation in mid-July and resume in the later weeks of September or the first week of October.

People generally take advantage of the high temperatures by spending more time outdoors during summer. Activities such as travelling to the beach and picnics occur during the summer months. Sports including cricket, association football (soccer), horse racing, basketball, American football, volleyball, skateboarding, baseball, softball, tennis and golf are played.

Water sports also occur. These include water skiing, wakeboarding, swimming, surfing, tubing and water polo. The modern Olympics have been held during the summer months every four years since 1896. The 2000 Summer Olympics, in Sydney, were held in spring and the 2016 Summer Olympics, in Rio de Janeiro, were held in winter.

Conversely, the music and film industries generally experience higher returns during the summer than other times of the year and market their summer hits accordingly. Summer is popular for animated movies to be released theatrically in movie theaters.[citation needed]

With many schools closed, especially in Western countries, travel and vacationing tend to peak during the summer. Teenagers and university students often take summer jobs, and business activity for the recreation, tourism, restaurant, and retail industries reach their peak.

With new authorities from Congress, USDA is working together with states, territories, tribes, schools, and countless other dedicated partners to ensure every child has the nourishment they need throughout the summer.

Traditionally, educators and policymakers have relied on conventional summer school programs to combat summer loss and summer gap-growth. In 2000, Cooper and colleagues published a comprehensive meta-analysis of classroom-based summer programs finding positive effects on average.8 However, they also concluded that middle-income students benefited more from summer programming than did lower-income students. They speculated that this could be because programs serving more advantaged students were of higher quality, or because of an interactive effect between programming and the home resources available to students. The result raised the concern that attempts to stem summer learning loss may actually exacerbate summer gap-growth if they are not well targeted.

While school-based summer learning programs hold promise when they fit the above criteria, they often fail to live up to these expectations. Two important reasons why school-based summer programs can be ineffective are that organizers often struggle to attract high quality teachers and struggle to appeal to students and families for whom the opportunity costs of attending summer school can be high.12 13School-based programs can also be quite costly. Researchers have therefore experimented, with some success, with lower-cost home-based summer programming.

Another recent randomized trial showed that something as simple as sending text messages over the summer to families of elementary school students at risk of summer loss was effective at improving the reading scores of third- and fourth-graders (but not first or second graders), with effect sizes of .21 to .29.17 The text messages included tips on resources available to students over the summer, ideas for activities to do with children, and information about the value of particular summer learning activities.

Regardless of the design, these policies should offer engaging options for students over the summer so that summer learning programs do not feel like punishment for students who would rather be enjoying summer vacation. Doing so would set more students up for success as the school year gets underway.

Schedule a call with our admissions experts who can answer any questions you may have and guide you through the booking process, including details on our summer school campuses, how to select the right programme, and what to expect when you arrive. e24fc04721

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