In the winters, Dexter compares colors fluttering in the summer with desolated sandboxes in the winters showing that he feels sadness in thw winter.
Step-by-step explanation:
There are certain proves and evidences which show that Dexter likes to be on the golf course or not because he says that when he is at the golf course during the time of winters, he feels there is melancholy, there is sadness in the atmosphere.
There is comparison of "gay colors which are fluttering in the winters" with the sandboxes in the winter which are desolated show that there is sadness in the atmosphere in the winters.