When does spring start in Australia and when is it going to start getting warmer?

You may have noticed the weather getting warmer or magpies starting to swoop, but it’s not officially spring yet.

Here’s why spring starts when it does and what we can expect from the warmer months.

When does spring start?

In Australia, it starts on September 1.

That’s because we follow the meteorological seasonal system, which means the seasons change on the first of September, March, June and December.

These guides make it easier for metrologists and climatologists to compare seasonal statistics.

But this is not the only way seasons are organized.

Some Indigenous Australian communities observe as many as six seasons in 12 months.

A lot of countries, like the UK and US, follow the astronomical season convention, meaning their seasons start between the 20th and 23rd of September, March, June and December.

In Sweden, temperature determines when the seasons change.

But not everywhere has a spring

There are areas of the world that do not have spring and autumn, instead having two seasons known as the wet season (most rain) and dry season (least rain).

These areas tend to be closer to the equator.

Northern parts of Western Australia, Queensland and the Northern Territory — as well as countries like Malaysia, Indonesia and Papua New Guinea — follow the wet-dry seasonal calendar.

Areas near the poles also follow just the two seasons in a year.

What causes the seasons?

Thanks to a few collisions during its formation, the Earth does not sit perfectly upright when it spins on its axis.

It is tilted at an angle of 23.5 degrees, which means different areas of the planet face the Sun more directly during their daylight hours at different times of the year.

The tilt also affects how much light we have during the day. So, in summer, days are longer because more hours are spent facing the Sun and they’re hotter because we’re facing the Sun more head-on.