Shortest Day of the Year in La Paz

When is the Summer Solstice (Southern Hemisphere)?

In La Paz, the summer solstice (southern hemisphere)—the day with the least daylight—occurs annually on or around June 20 or 21. This is the day when the Earth's axial tilt points the Southern Hemisphere farthest from the Sun, putting the Sun at its lowest arc across the sky in La Paz.

Because the Sun takes a shallower path through the sky, it both rises later and sets earlier than at any other time of year. Twilight on either end of the day is compressed, and the net result is approximately 13 hours of usable daylight at La Paz's latitude of -16.49°.

Why does this happen?

The Earth's axis is tilted approximately 23.4° relative to the plane of its orbit. This tilt is what gives us seasons. Around the summer solstice (southern hemisphere), theSouthern Hemisphere is tilted away from the Sun, so:

• The Sun rises at its southernmost point on the horizon (in the Southern Hemisphere).
• Daytime is at its shortest; nighttime is at its longest.
• The Sun's rays strike the ground at a low angle, spreading energy over a larger area and reducing heating.
• Cities at high latitudes can experience extreme conditions—though not polar night at this latitude.

What changes around the summer solstice (southern hemisphere)?

In the week before and after the summer solstice (southern hemisphere), daylight length in La Paz barely changes—shifting by only a minute or two per day. This is the "stillpoint" of the year, where the rate of change is at its slowest. After the solstice, days begin to lengthen again, and the Sun's arc gradually rises toward the south over the following months.

Daily life in La Paz around the summer solstice (southern hemisphere)

For residents of La Paz, the summer solstice (southern hemisphere) falls in mid-year and marks the astronomical peak of the Southern winter. The days are short, but the timing is the opposite of the Northern Hemisphere: the seasonal rhythms here align with June rather than December, and many Southern Hemisphere cultures treat this as a midwinter festival moment.

Related tools

• See today's current time in La Paz including sunrise and sunset.
• Check how many hours of daylight La Paz gets today—it changes throughout the year.
• Compare with the longest day of the year in La Paz to see the full seasonal swing.
• View the full sunrise & sunset calendar for La Paz.