The seasons and nature have become very common allegories in modern poetry. Many of my class readings for this semester (Shakespeare, Pope, Milton, etc.) draw heavily on the seasons especially -- to a point where it almost becomes cliche.
Like we said in class, Eliot had a knack for using inversion and working themes/cliches against themselves, and I think this helped him actually enforce his messages and themes. The Wasteland is the first piece of poetry I've ever read to condemn Spring and exalt Winter... and I slowly drew a connection between The Wasteland and The Lovesong through a well-known phrase that goes something like, "the greatest moment of excitement is in the anticipation of the event." It seems that in The Lovesong the speaker always talks himself down from the anticipation of anything actually happening because he doesn't want to disappoint himself. He closes himself off from love because he has experienced it and knows there are strings attached, strings that will sully the excitement of his anticipation.
I see The Wasteland as a kind of progression that Prufrock could possibly make from a shut-in to a total inversion of himself. I can see Prufrock actually taking pleasure in the unpleasant things in life and accept them as an alternative to the "illusion" of happiness that he walks us through in The Lovesong.
It would totally be in character for Prufrock to comment on the sanctuary of Winter and contentedly shut himself in with a blanket and a good novel instead of walking outside during Spring and experiencing beauty only to realize that it will, in time, fade.