First Day Of Winter 2024 Australia Time. Winter 2024 starts on saturday, december 21st in the northern hemisphere, with the first day of winter being the shortest daylight day of the year with the earth's axis having reached its furthest tilt away from the sun and. This is the first day of astronomical summer and occurs as the sun reaches its most northerly or southerly path in the sky.

We often just think of a solstice as applying to the whole day (or night) but there. Autumn in australia begins on march 20 or 21 and ends on june 20 or 21, placing it.