Sorry - it should of course have been "newcomer" (I cheated and lifted the text from the version posted by Stewart, and modified it to match Dave Goulder's book. But unaccountably I missed that line. Sod's Law rules. So here is the version Dave Goulder wrote and sings:

The January man he walks abroad in woollen coat and boots of leather.
The February man still wipes the snow from off his hair and blows his hands.
The man of March he sees the spring and wonders what the year will bring,
And hopes for better weather.

Through April rain the man goes down to watch the birds come in to share the summer.
The man of May stands very still watching the children dance away the day.
In June the man inside the man is young and wants to lend a hand,
And grins at each newcomer.

And in July the man in cotton shirt he sits and thinks on being idle.
The August man in thousands takes the road to watch the sea and find the sun.
September man is standing near to saddle-up and lead the year,
And autumn is his bridle.

And the man of new October takes the reins, and early frost is on his shoulder.
The poor November man sees fire and wind and mist and rain and winter air.
December man looks through the snow to let eleven brothers know,
They're all a little older.

And the January man comes round again in woollen coat and boots of leather,
To take another turn and walk along the icy road he knows so well.
The January man is here for starting each and every year,
Along the way forever.