I've figured them out, they're pretty simple guitar chords:

C
When chimney smoke hangs still and low
F
Across the stubble fields of snow
    C
And angry skies reach down to seize
    G
The sorry blackened bones of trees
C                              F
In the dead of winter when the silent snowbirds come
          C
You're my sweet maple sugar, honey
G            C
Hot buttered rum.


When dreary Christmas decorations
Line the streets and filling stations
And dimestore Santas can't disguise
Their empty hands and empty eyes
In the dead of winter
When the tinsel angels come
You're my sweet maple sugar, honey
Hot buttered rum.

When gloves and boots and woolen parkas
Bring cold comfort to the heart
And bitter memories freeze the tongue
And songs of love are left unsung
In the dead of winter
When those cold feelings come
You're my sweet maple sugar, honey
Hot buttered rum.