Memorial Day is a United States federal holiday observed on the last Monday of May. Formerly known as Decoration Day, it commemorates U.S. men and women who died while in the military service. First enacted to honor Union soldiers of the American Civil War (it is celebrated near the day of reunification after the Civil War), it was expanded after World War I.

In the United States, Flag Day is celebrated on June 14. It commemorates the adoption of the flag of the United States, which happened that day by resolution of the Second Continental Congress in 1777.

Father's Day is a day honoring fathers, celebrated on the third Sunday of June in 52 of the world's countries and on other days elsewhere. In the US, Father's Day is celebrated on the third Sunday in June. Its first celebration was in Spokane, Washington on June 19, 1910. Other festivities honoring fathers had been held in Fairmont and in Creston, but the modern holiday didn't emerge from those.

Summer is the warmest of the four temperate seasons, and includes the longest days. It lies between spring and autumn. The seasons start on different dates in different cultures based on astronomy and regional meteorology. However generally, when it is summer in the southern hemisphere it is winter in the northern hemisphere, and vice versa. In areas of the tropics and subtropics, the wet season occurs during the summer. Tropical cyclones develop and roam the tropical and subtropical oceans during the summer. In the interior of continents, thunderstorms are most likely to produce hail during the afternoon and evening. Schools have a summer break to take advantage of the warmer weather and longer days. The Summer Solstice occurs exactly when the earth's axial tilt is closest to the sun at its maximum of 23° 26'.

In the United States, Independence Day, commonly known as the Fourth of July, is a federal holiday commemorating the adoption of the Declaration of Independence on July 4, 1776, declaring independence from the Kingdom of Great Britain.

Traditionally, Labor Day is celebrated by most Americans as the symbolic end of the summer. Labor Day is a United States federal holiday observed on the first Monday in September. The holiday originated in Canada out of labor disputes ("Nine-Hour Movement") first in Hamilton, then in Toronto, Canada in the 1870s, which resulted in a Trade Union Act which legalized and protected union activity in 1872 in Canada. The parades held in support of the Nine-Hour Movement and the printers' strike led to an annual celebration in Canada. In 1882, American labor leader Peter J. McGuire witnessed one of these labor festivals in Toronto. Inspired from Canadian events in Toronto, he returned to New York and organized the first American "labor day" on September 5 of the same year.

National Grandparents Day is a secular holiday celebrated in the United States and Canada on the first Sunday after Labor Day and is celebrated in the United Kingdom on the first Sunday in October. Some people claim the origin of the holiday resides with the efforts of Hermine Beckett Hanna of North Syracuse, New York, recognizing seniors and their importance as early as 1961. On February 21, 1990, New York Congressman James T. Walsh recognized the efforts of Hermine Beckett Hanna in front of the U.S. House of Representatives, thanking her "for her important role in the establishment of Grandparents Day."

In the United States, Patriot Day occurs on September 11 of each year, designated in memory of the 2,993 casualties in the September 11, 2001, attacks. Most Americans refer to the day as "Nine-Eleven (9/11)," "September 11th," or some variation thereof.

Constitution Day (or Citizenship Day) is an American federal observance that recognizes the ratification of the United States Constitution and those who have become U.S. citizens. It is observed on September 17, the day the U.S. Constitutional Convention signed the Constitution in 1787.

Autumn (also known as fall in North American English) is one of the four temperate seasons. Autumn marks the transition from summer into winter, usually in March (southern hemisphere) or September (northern hemisphere) when the arrival of night becomes noticeably earlier.

Christopher Columbus's arrived in America on October 12, 1492 in the Julian calendar and October 21, 1492 in the modern Gregorian calendar. The day is celebrated as Columbus Day in the United States. Columbus Day first became an official state holiday in Colorado in 1906, and became a federal holiday in 1934. Since 1971, the holiday has been fixed to the second Monday in October, coincidentally the same day as Thanksgiving in neighboring Canada (which was fixed to that date in 1959).

Boss's Day (also known as Bosses Day or National Boss Day) is a secular holiday celebrated on October 16 in the United States. It has traditionally been a day for employees to thank their boss for being kind and fair throughout the year. The holiday has been the source of some controversy and criticism in the United States, where it is often mocked as a Hallmark Holiday.

Sweetest Day is an observance celebrated primarily in the Great Lakes region, and parts of the Northeast United States on the third Saturday in October. Once known as a day to spread love and cheer to the unfortunate, this popular holiday in the northern U.S. is now known as a day to show affection to the loved ones in your life.

United Nations Day is devoted to making known to peoples of the world the aims and achievements of the United Nations Organization.

Halloween (also spelled Hallowe'en) is an annual holiday celebrated on October 31. It has roots in the Celtic festival of Samhain and the Christian holy day of All Saints, but is today largely a secular celebration. The ancient Celts believed that the border between this world and the Otherworld became thin on Samhain, allowing spirits (both harmless and harmful) to pass through. The family's ancestors were honoured and invited home whilst harmful spirits were warded off. It is believed that the need to ward off harmful spirits led to the wearing of costumes and masks. Their purpose was to disguise oneself as a harmful spirit and thus avoid harm.

Daylight saving time is the practice of advancing clocks so that afternoons have more daylight and mornings have less. Ends in the United States and Canada the first Sunday in November since 2007.

Election Day in the United States is the day set by law for the election of public officials. Election Day in the United States is the day set by law for the election of public officials. For federal offices (United States Congress and President and Vice President), it occurs on the Tuesday after the first Monday of November in even-numbered years; the earliest possible date is November 2 and the latest November 8.

It is also celebrated as Armistice Day or Remembrance Day in other parts of the world, falling on November 11, the anniversary of the signing of the Armistice that ended World War I. Veterans Day is an annual American holiday honoring military veterans. A federal holiday, it is usually observed on November 11. However, if it occurs on a Sunday then the following Monday is designated for holiday leave, and if it occurs Saturday then either Saturday or Friday may be so designated.

Thanksgiving Day is a harvest festival celebrated primarily in the United States and Canada. Traditionally, Thanksgiving is associated with giving thanks to God for the harvest and expressing gratitude. While historically religious in origin, Thanksgiving is now primarily identified as a secular holiday.

Black Friday is the Friday following Thanksgiving Day in the United States, which is the beginning of the traditional Christmas shopping season. Electronics and popular toys are often the most sought-after items and may be sharply discounted.

Cyber Monday is the Monday after Thanksgiving, and it's the day when merchants offer the best deals online.

Hanukkah (also romanized as Chanukah), also known as the Festival of Lights, is an eight-day Jewish holiday commemorating the rededication of the Holy Temple in Jerusalem at the time of the Maccabean Revolt of the 2nd century BCE. Hanukkah is observed for eight nights.

Green Monday is an online retail industry term similar to Cyber Monday. Traditionally the 2nd Monday of December or with at least 10 days prior to Christmas.

Super Saturday is the last Saturday before Christmas, a major day of revenue for American retailers, marking the end of the shopping season started by Black Friday. Super Saturday targets last-minute shoppers.

Winter is the coldest season of the year, between autumn and spring. The season includes the time of year with the shortest days and longest nights.

Christmas or Christmas Day is an annual Christian holiday commemorating the birth of Jesus Christ.

Kwanzaa is a weeklong celebration held in the United States honoring universal African heritage and culture, marked by participants lighting a kinara (candle holder). It is observed from December 26 to January 1 every year.