Winter is just around the corner.
It's time to add extra clothing to our packs. Inexperienced hikers will dress for the warm day's temperature, not realizing that the days are shorter and the temperature can drop 30 to 40 degree once the sun has set. Personally for September and October my light weight polypropylene bottom and tops are replaced with expedition weight. Also add polartec pants to balance with polartec jacket already in my pack. For colder months of November, December, January and February a down jacket, wool balaclava, and mittens are added.