The Longest Day Of The Year 2024 Australia. The longest day in australia is 24 hours long i.e. On december 21, 2024 — the longest day of the year in the southern hemisphere — people in sydney, australia, will experience 14 hours, 24 minutes, and 47 seconds of sunlight.

In other words, during december solstice it is winter time in the uk, the usa, canada, russia, india and china and it is the shortest day of the year while it is summer time in australia,. As weatherzone explains, the orientation of earth relative to the sun makes the date of the summer solstice the longest day of the year in australia.