hello chatboss;
about shakespeare's sonnet 28; it is the most valuable and interesting sonnet among his. about the "discussion" of this sonnet i think :
he means by summer : spring
Shakespeare as an intelligent writer he made an argument at first in his sonnet as all sonnets start to develop it then to have a conclusion about this argument at the end .
he started comparing his mistress to a spring's day with what this season brings good things with it , then he starts developing by denying that his mistress cannot be compared to anything. and his misress is more lovely and temperate as he stated at first ..
then with the turn point and the 4th stanza he started describing his mistress's favors, and she is so dear to him and how he loved her , and how she is so pure inside him.
at the end with the last stanza he concluded the answer to his argument by immortalizing his mistress by this verse and by everything he meant
actually, if i need to explain more it may take more than 10 hours to discuss this sonnet

by i hope i did write an outline of it and i hope that everyone can understand my simple words. regards