Summer Quiz
Welcome to the Summer Quiz, reviewed for 2026.
These 24 questions explore seasons, skies, water, weather, sport and a few specifically attributed celebrations. Summer does not happen at the same time—or look the same—everywhere, so the quiz includes Northern Hemisphere, Southern Hemisphere and tropical perspectives.
Play solo or in teams. Choose one answer for each question, then read the explanation before moving on. The three rounds progress from easy to hard, but every answer is supported by an official scientific or cultural source. No video or audio is required.
Challenge note: The hard round is designed to be difficult. Take your time, use the hints, and read each explanation before moving on.
Question 1:
What is the main reason Earth has seasons?
Think about the angle at which sunlight reaches each hemisphere.
Earth's rotational axis is tilted - Earth's tilted axis changes the angle and duration of sunlight each hemisphere receives during the year. Distance from the Sun is not the main cause of the seasons.
Question 2:
When it is summer in the Northern Hemisphere, what season is it in the Southern Hemisphere?
The two hemispheres tilt in opposite directions relative to the Sun.
Winter - The hemispheres are tilted in opposite directions relative to the Sun. When the north receives more direct sunlight, the south receives less, so their seasons are opposite.
Question 3:
Which months are commonly defined as meteorological summer in Australia?
Australia is in the Southern Hemisphere.
December, January and February - Australia's Bureau of Meteorology commonly uses December through February for summer. It also notes that tropical and Indigenous seasonal calendars can divide the year differently.
Question 4:
Off which Australian state does the Great Barrier Reef extend?
It is on Australia's north-eastern coast.
Queensland - The Great Barrier Reef extends along the coast of Queensland in north-eastern Australia and includes the world's largest coral reef ecosystem.
Question 5:
On the US EPA scale, which UV Index range is classed as Very High to Extreme?
It is the highest category in the grouped scale.
8 and above - The EPA groups UV Index values of 8 and above as Very High to Extreme and advises extra protection. Local agencies should guide personal decisions.
Question 6:
What does the informal term 'heat lightning' usually describe?
The storm is farther away than it appears.
Light from a distant thunderstorm - The US National Weather Service says heat lightning is not a distinct lightning type. It is lightning from a storm too far away for the observer to hear its thunder or see the actual bolt clearly.
Question 7:
Which decorated structure is central to many Swedish Midsummer celebrations?
It is commonly decorated with leaves and flowers.
A maypole - Sweden's official country site describes decorating, raising and dancing around a maypole as a central part of many Swedish Midsummer celebrations. Practices still vary by family and place.
Question 8:
Where were the first modern Olympic Games held in 1896?
The host city was in Greece.
Athens - The IOC archives identify Athens as host of the first modern Olympic Games, held from 6 to 15 April 1896.
Question 9:
Which is the largest of Earth's named ocean basins?
It borders eastern Asia and western North and South America.
Pacific Ocean - NOAA identifies the Pacific as the largest and deepest of Earth's ocean basins.
Question 10:
What is the name for the point in Earth's orbit when Earth is farthest from the Sun?
The corresponding nearest point is perihelion.
Aphelion - Aphelion occurs in July. NASA emphasizes that Earth's axial tilt—not this distance—is the main cause of the seasons.
Question 11:
Which pair of seasons is often more useful than a four-season model in Australia's northern tropics?
The distinction is based mainly on rainfall.
Wet and dry - Australia's Bureau of Meteorology explains that wet and dry seasons better describe much of the northern tropics. Indigenous seasonal calendars can be more locally detailed still.
Question 12:
Approximately how far does the Great Barrier Reef Marine Park extend along Queensland's coast?
It is measured in thousands, not tens, of kilometres.
2,300 kilometres - The Great Barrier Reef Marine Park Authority gives an approximate north-to-south extent of 2,300 kilometres.
Question 13:
On which dates is Sendai's Tanabata festival normally held?
Sendai observes it a month later than many July Tanabata events.
6–8 August - The Japan National Tourism Organization lists Sendai Tanabata for 6–8 August. It is a named local festival, not a claim that all Japanese summer festivals follow one pattern.
Question 14:
Which description best matches a derecho?
The name is associated with winds moving straight ahead.
A fast-moving band of thunderstorms with destructive straight-line winds - NOAA describes derechos as fast-moving bands of thunderstorms with destructive winds that travel in straight lines, unlike the rotating winds of tornadoes or hurricanes.
Question 15:
What are the official dates of the Atlantic hurricane season?
It spans six months from early June through late autumn in the Northern Hemisphere.
1 June to 30 November - NOAA defines the Atlantic hurricane season as 1 June through 30 November, while noting that storms can occur outside those dates. Other ocean basins use different terms and seasons.
Question 16:
What is the seasonal layering of warmer surface water above colder deep water in many temperate lakes called?
The water separates into temperature layers.
Thermal stratification - USGS explains that many lakes develop a warm, less-dense upper layer over colder deep water in summer. That layering is thermal stratification; it is not simply a rapid rise in the whole lake's temperature.
Question 17:
About how far is Earth's rotational axis tilted relative to its orbital plane?
It is a little less than one quarter of a right angle.
23.4 degrees - NASA gives Earth's axial tilt as about 23.4 degrees. This tilt drives the annual pattern of seasons.
Question 18:
At the June solstice, the Sun is directly overhead at which named latitude line?
Choose the tropical latitude north of the Equator.
Tropic of Cancer - At the June solstice, the Sun's direct rays reach the Tropic of Cancer, about 23.5 degrees north. The Southern Hemisphere is then tilted away from the Sun.
Question 19:
What is the highest value shown at the upper end of the standard UV Index forecast scale?
The scale's top is written with a plus sign.
11+ - The UV Index forecast scale runs from 1 through 11+, with 11+ indicating extreme UV levels. The EPA groups 8 and above as Very High to Extreme for protection guidance.
Question 20:
Which ocean basin contains more than half of Earth's free water?
It is also the largest and deepest ocean basin.
Pacific - NOAA reports that the Pacific covers about 63 million square miles and contains more than half of Earth's free water.
Question 21:
The Great Barrier Reef extends across approximately how many degrees of latitude?
It is a two-digit number between 10 and 20.
14 - The Great Barrier Reef Marine Park Authority says the Reef extends over 14 degrees of latitude, helping explain its wide range of habitats.
Question 22:
Sweden's Midsummer's Eve always falls on a Friday within which date range?
It is close to the June solstice.
19–25 June - Sweden.se states that Midsummer's Eve is always the Friday between 19 and 25 June. How people observe it varies.
Question 23:
In the Atlantic, a tropical cyclone becomes a hurricane at what maximum sustained wind speed?
It is the Category 1 threshold, below the major-hurricane threshold.
74 mph (64 knots) - NOAA uses 74 mph, or 64 knots, as the hurricane threshold. The terminology differs by ocean basin, where equivalent storms may be called typhoons or cyclones.
Question 24:
Why can the warmest weeks in southern Australia occur after the December summer solstice?
Temperature responds more slowly than daylight length.
Oceans around Australia delay peak warmth - The Bureau of Meteorology describes a seasonal temperature lag: the oceans and land retain and accumulate heat, so southern Australia's warmest period is often in late January or early February, after the solstice.
