How many days span the Australian summer

Australians often think of summer as Christmas lunch followed by a swim at Bondi Beach, late afternoon thunderstorms over Brisbane, or long evenings on a Perth verandah. The season stretches from the start of December through the end of February, but the exact number of days depends on whether February has 28 or 29 days.

For most everyday planning, Australia follows the meteorological definition of summer, which runs from 1 December to 28 February. This fixed three-month block is what schools, workplaces and government calendars use when they speak of the summer period. Astronomical summer, tied to the solstice and equinox, falls a few weeks earlier and later, but meteorologists prefer the cleaner date range for record keeping and seasonal comparisons.

Defining summer by the meteorological calendar

The Bureau of Meteorology and most Australian government agencies treat summer as a fixed window: 1 December through 28 February. The reasoning is practical. Locking summer to calendar months makes it easier to compare temperature records, rainfall totals and bushfire risk from one year to the next.

Astronomical summer, which begins at the December solstice around 21 December and ends near the March equinox, varies slightly in length each year. The meteorological approach avoids that wiggle. It also lines up neatly with the Australian school summer holidays, which typically kick off in early December and finish in early February.

Counting the days from December to February

To work out how many days sit between the first and last day of summer, you simply add up the three months. December has 31 days. January has 31 days. February has 28 days in a common year. Adding these together gives 90 days from 1 December to 28 February inclusive.

If you wanted to count only the days strictly between the start and end dates, that is, excluding either endpoint, the answer would be 89. Most readers asking the question, however, want the inclusive figure, since it matches how holidays, festivals and working weeks are planned.

When February adds an extra day

Every four years, February stretches to 29 days and the Australian summer gains one extra day. In those leap years the count from 1 December to 29 February inclusive is 91 days instead of 90.

Recent and upcoming leap summers include 2024, 2028, 2032, 2036 and 2040. A simple way to spot a leap year is that the year is divisible by four, except for century years, which must be divisible by 400. So 2000 was a leap year, but 2100 will not be. For Australians planning a multi-week summer escape or a long project schedule, knowing whether February has 29 days can shift the total by enough to matter.

School holidays, cricket and beach planning

The Australian summer school break usually runs for about six weeks, starting in mid to late December and ending in late January or early February. Families mapping out caravan trips along the New South Wales coast, flights to Cairns, or camping at Innes National Park in South Australia often work backwards from the end of the holidays.

The cricket season also straddles this period. The Boxing Day Test at the Melbourne Cricket Ground and the New Year's Test at the Sydney Cricket Ground are fixed calendar fixtures that fall inside the 90- or 91-day window. Locals buy tickets, book hotels in Melbourne's South Bank or Sydney's Moore Park, and schedule their own beach time around the days they are at the ground.

Christmas, New Year and the food calendar

Several big cultural dates fall inside the summer count. Christmas Day on 25 December, Boxing Day on 26 December and New Year's Day on 1 January are all part of the 90-day stretch in a common year. In a leap year, 29 February is a bonus date that does not recur for another four years, and it occasionally falls on a Tuesday or Thursday, the days when Melbourne Cup-style public events are sometimes scheduled.

The food calendar lines up with the season too. Mango season runs from about September through March, peaking in December and January. Cherry growers in New South Wales and Victoria begin picking in late October, but the bulk of the fruit hits shops between November and February. For anyone tracking produce for a summer menu or a farmers' market stall in Adelaide or Hobart, knowing the exact end of February helps with last orders.

Daylight saving across southern Australia

Daylight saving time shifts the clock forward by one hour during the warmer months in the Australian Capital Territory, New South Wales, Victoria, South Australia and Tasmania. It typically begins on the first Sunday of October and ends on the first Sunday of April. Queensland, Western Australia and the Northern Territory do not change their clocks.

For residents of Sydney, this means the sun sets close to 8.30 pm around the summer solstice, while Brisbane, which sits about 900 kilometres north but stays on standard time, sees its latest sunset roughly half an hour sooner on the same date. The clock change does not alter the number of days between the first and last day of summer, but it does shape how those days feel, especially for anyone coordinating video calls between Adelaide and Perth.

Working out business days and weekday patterns

Many Australians want to know how many working weekdays fall inside the summer window for rostering, payroll or holiday pay calculations. The full 90-day block contains roughly 64 weekdays, give or take one or two depending on how the dates align with weekends.

For a more precise count, business-day calculators subtract the weekends and any public holidays inside the period, such as Christmas Day, Boxing Day, New Year's Day and Australia Day on 26 January. The result can shift by a day or two from year to year, which matters when scheduling projects that need a fixed number of work days before the kids return to school.

For more detailed date maths, the calendar tool on this site handles the heavy lifting. A quick glance at the month pages also shows weekday patterns across the 13-week span, which is handy when scheduling annual leave around the Christmas-New Year break. If a particular calculation throws up a question, the easiest way to reach the team is the contact page. Whether you are sorting out a roster across Brisbane and Sydney, or simply checking how many sleeps until the cricket season ends, the site is built for fast answers.