I've been playing around with this, and here's how it is now.

The Lady Snowman.

She stood in the yard
at the back of our place,
with her hat on her head
and a smile on her face,
She had coals for her eyes,
and a spud for a nose,
And so homely and snug,
in her coat made of snow.
Oh lady stay with us
as long as you may,
with the snow blowing around,
and the children at play,
you are back here for Christmas,
but just for the day,
for the sun in the morning
will melt you away.

The first time we built her
I can hardly recall,
We dug in the snow,
and we built her so tall,
And when we were finished,
my Dad said, "You know,
I think we have made us
a lady of snow."
Oh lady stay with us
as long as you may,
with the snow blowing around,
and the children at play,
you are back here for Christmas,
but just for the day,
for the sun in the morning
will melt you away.

And the next day she melted,
she was gone clean away,
And my Ma said, don't worry,
she'll be back here someday,
And the very next Christmas,
well wouldn't you know,
she was back there once more,
standing there in the snow.
Oh lady stay with us
as long as you may,
with the snow blowing around,
and the children at play,
you are back here for Christmas,
but just for the day,
for the sun in the morning
will melt you away.

Well most years at Christmas,
there's no snow around,
And that means the lady
is not to be found,
But as the years pass,
and it's just now and then,
the snow comes at Christmas,
and she's there once again.
Oh lady stay with us
as long as you may,
with the snow blowing around,
and the children at play,
you are back here for Christmas,
but just for the day,
for the sun in the morning
will melt you away.

(If any one wanted to sing this, The Cliffs of Doneen fits it well, though my tune's a bit different.)