You dont have to say why if there isn’t a good reason :)
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November is pretty cool, because not only do you either not have to deal with Christmas, or you can complain about it. Then we have Thanksgiving, and the weather is pretty nice where I am during November, and considering every other time of the year it's either hot, muggy, cold, or a hurricane, it's cool.
End of September. That's when summer really starts fading into fall. It's still warm enough to swim during the day, but cool enough to go stargazing in a sweater.
October has always been my favorite. I love the weather and Halloween has always been my favorite holiday.