IN THE USA today, many Americans will be celebrating the first day of spring. Down under, of course, we have autumn while they’re having spring, but our first day of autumn was back on March 1st. Why do we have different dates for our seasons?
Americans tend to count the start of spring from the equinox, the day of the year when daylight hours and dark hours are equal.
Meteorologists are a bit more arbitrary in their definition, and Australia has followed their tradition. Autumn starts of the 1st of March in order that longer term weather trends can be meaningfully compared.
In all reality, the delineation of the year into four seasons is just as arbitrary as starting them on the first of a certain month…
Read more: http://www.abc.net.au/environment/articles/2014/03/21/3968123.htm