Today is metereologically speaking, the first day of spring.
That means, according to temperature,
March 1 represents, in the northern hemisphere,
the beginning of spring,
and in the southern hemisphere,
the beginning of autumn—
either way, the three, on average, more temperate months.
We don’t tend to really think about March 1 that way.
It’s not written into our calendars as the first day of spring.
We’re much more driven by equinoxes and solstices—
the astronomical seasonal definitions—
according to which the beginning of spring
falls somewhere around March 20.
But, according to the thermometer,
today it starts to feel like spring.