Before you thought of spring

Before you thought of Spring
Except as a Surmise
You see - God bless his suddenness -
A Fellow in the Skies
Of independent Hues
A little weather worn
Inspiriting habiliments
Of Indigo and Brown -
With Specimens of Song
As if for you to choose -
Discretion in the interval
With gay delays he goes
To some superior Tree
Without a single Leaf
And shouts for joy to Nobody
But his seraphic self -