Do you think it is because the leaves absorb some of the sound, but they are now gone for the winter?
And also...Do you think that this observation/speculation is:
a) astutely scientific of me and I should immediately cease studying and transfer to the Physics Department?
b) interesting, but not brilliant, and thus I should keep plodding away to my exams of doom?
c) the most ridiculous thing you have heard lately, besides this?