The Door into Summer

With the cold weather outside, and inspired by Robert Heinlein's book of the same name, where is the door...?

The Door into Summer
(A Villanelle)

The cold winter snows, this I mind
I am the cat that is walking alone
And the door into summer, I shall find
 
Windows coated with frost so unkind
I curl up sleeping, near the hearthstone
The cold winter snows, this I mind
 
In darkness I walk, others are blind
Cat's eyes see a spectral unknown
And the door into summer, I shall find
 
I try the front door, but I am confined
Still snowing heavy, my exit postponed
The cold winter snows, this I mind
 
I try a backdoor, still snow divined
There is no escape, this I bemoan
And the door into summer, I shall find
 
On my owners lap, there I reclined
Outside the wind whistles and moans
The cold winter snows, this I mind
And the door into summer, I shall find.