Summer officially begins on 1 December, and by 25 December 2026 the country runs its hottest, longest-daylight stretch of the year. December closes 2026 in the fourth calendar quarter, the final quarter under the standard January-to-December system used on this page.
Friday 25 December 2026 is the last working day of the standard Monday-to-Friday week, the fifth and final working day before the weekend begins. A public holiday landing on this day of the week joins directly onto the Saturday and Sunday that follow it, forming a three-day weekend without using any annual leave.
The quarter containing 25 December 2026 is based on the calendar year running January to December, a separate system from the Australian financial year, which runs from 1 July to 30 June and splits into its own four quarters. Businesses often track both systems side by side, one for tax filings and one for calendar-year planning.