Source: https://www.timeanddate.com/astronomy/facts-about-june-solstice.html
Here is the outline, with excerpts, from the article link posted above:
11 Things About the June Solstice
1. Summer & Winter Solstice
In the Northern Hemisphere, where it is the longest day of the year in terms of daylight, the June Solstice is also called the Summer Solstice. In the Southern Hemisphere, on the other hand, it is the shortest day of the year and is known as the Winter Solstice.
2. First Solstice of the Year
Solstices happen twice a year – in June and December. The June Solstice happens around June 21, when the Sun is directly overhead the Tropic of Cancer.
3. When the Sun Seems to Stand Still
Solstice comes from the Latin words sol, meaning Sun and sistere, meaning to come to a stop or stand still.
4. It Occurs at the Same Time…
…all over the world. Technically, the June Solstice is the exact instant of time when the Sun is directly overhead the Tropic of Cancer. In 2017, this will happen on June 21 at 04:24 UTC.
5. It Can be on June 20, 21, or 22
Even though most people consider June 21 as the date of the June Solstice, it can happen anytime between June 20 and June 22.
6. It’s the First Day of Summer…
In many Northern Hemisphere cultures, the day is traditionally considered to be the mid-point of the summer season. Midsummer celebrations on or around the Northern Summer Solstice are common in many European countries.
7. The Earth is Farthest from the Sun
One might think that since it is summer in the Northern Hemisphere, the Earth is closest to the Sun during the June Solstice. But it’s the opposite. The Earth is actually farthest from the Sun during this time of the year.
8. The Earliest Sunrise of the Year Doesn’t Happen on This Day
Even though the June Solstice is the longest day of the year in the Northern Hemisphere, most places do not see the earliest sunrise of the year on this day. The earliest sunrise happens a few days before, and the latest sunset takes place a few days after, the June Solstice.
9. Not Usually the Hottest Day of the Year
In fact, the hottest day of the year in the Northern Hemisphere usually comes a few weeks or sometimes months after the Solstice.
10. The Arctic Circle has 24 Hours of Daylight
The June Solstice is the only day of the year when all locations inside the Arctic Circle experience a continuous period of daylight for 24 hours.
11. It’s Celebrated Around the World
The June Solstice holds a special place of celebration in many cultures. People around the world celebrate the day with feasts, picnics, dance, and music.
— Submitted by Jeff