A common Northern Hemisphere instinct is to assume spring must begin in March (their spring) or October (their autumn). This fails because seasons are defined by solar intensity, not calendar dates. When the Northern Hemisphere tilts toward the sun (March equinox), the Southern Hemisphere tilts away, beginning autumn. When the Northern Hemisphere tilts away (September equinox), the Southern Hemisphere tilts toward the sun—spring begins.
This is the system most Australians (and their weather bureaus) actually use. To simplify climate records, meteorologists divide the year into neat three-month blocks. In Australia, meteorological spring runs from September 1 to November 30 . This aligns with average temperature patterns, making it far more practical for farming, bushfire planning, and daily life. what month does spring begin in australia?