Watch the ridges on clear days with a northwest wind. Sept 13-15 New moon. Look overhead for the Summer Triangle, made up of the bright stars, Deneb, Vega, and Altair. Sep 17-18 First light frosts may occur about this date. Sept 19 Height of the south-bound migration.
More individual birds are on the wing than at any other time of year.
Look for ripening wild grapes along old stonewalls. The large green darner dragonflies migrate about this time. Watch for them over sunny fields and gardens. October Full moon. The Harvest Moon.