It's fall. Do you want to know how I can tell?

Clue 1: It's cold
        Classifier: How cold?

Clue 2: Cold enough to wear wool
        Classifier: How many layers of wool?

Clue 3: One thick layer of wool.
         Classifier: anything else?

Clue 4: And a jacket.
         Classifier: A jacket or coat?

Clue 5: A jacket that doesn't need to extend below my hips and is NOT made of wool
        Note: Some people wear ski coats instead of wool or leather coats in winter.  I find these people less than tasteful.  Especially if he or she is a professional.  Especially if attatched to their ski coat is any amount of lift tags.  Regardless of taste if one is wearing any coat made of more than one layer of jean/canvass/courduroy etc material, it is classified as a winter coat, and you have descended below the depths of winter's icy chill.
           Classifier: anything else?

Clue 6: No long johns or second underlayer benieth pants, no scarf and gloves in combination with acceptable jacket, no second or third layer of sweater benieth acceptable jacket, no feeling of pain from cold when leaving the apartment when dressed in such layers.

And finally--irrevocably

Clue 7: NO snow on the ground.

Even though I wore a turtle kneck today for the first time of the season, it is still considered fall.