It Begins

Sumer is icumen in,
Lhude sing cuccu!
Groweth sed, and bloweth med,
And springth the wude nu–
Sing cuccu!

— English round, 1260

Winter is icumen in,
Lhude sing Goddamm,
Raineth drop and staineth slop,
And how the wind doth ramm!
Sing: Goddamm.

— Ezra Pound, 1917

The names of the 12 months can be anagrammed into these lines:

Merry, durable, just grace
My every future month embrace;
No jars remain, joy bubble up apace.

But poet and journalist George Ellis (1753-1815) summed them up this way:

Snowy, Flowy, Blowy,
Showery, Flowery, Bowery,
Moppy, Croppy, Droppy,
Breezy, Sneezy, Freezy.