Sentence:  So this was my future home, I thought!...Backed by towering hills, the but faintly discernible purple line of the French boundary off to the southwest, a <WSD>sky</WSD> of palest Gobelin flecked with fat, fleecy little clouds, it in truth looked a dear little city; the city of one's dreams. 
Meaning of the word marked with <WSD> tags:  The part of the sky which can be seen from a specific place or at a specific time; its condition, climate etc.