Amazing that the meteorological calendar just happens to start on the arbitrary choice of the first day of the month once a quarter in an imperfect calendar scheme. I’ll stick with solstice and equinox based definitions. Weathermen can’t even forecast the weather the next day at times. Why should I let them arbitrarily choose the seasons?
“Astrological Calendar” was already taken.
It’s not arbitrary, it’s based on the practicality of weather/climate in N America. Your 3 colder months are Dec-Jan-Feb…on average.
Solar heating drops considerably after the Fall Equinox around sept 21 but the thermal mass of oceans delays the effects. Same reason why cold hangs around after the solar heating starts increasing in February, the ocean act the opposite as heat sinks.
Astronomical seasons are obviously quite accurate and reliable but they don’t match practicality caused by geographical features.