My base weight 3 season, this is if carrying my fleece and down vest is 13pounds 9 oz. Most of my hiking is in spring when I have he time. Summer weight would easily be 2 to 2.5 pounds lighter? I weighed with fleece and vest in pack as unless very cold conditions I would be carrying it. In very wet weather I would carry second rain fly for my Hammock to ensure I would stay dry. That would be about 1 more pound. There are allot of variables.
Bye the way I credit my base weight being this low to this forum!