I use a 20F bag with a fleece blanket inside it for the temp range you are expecting. Below about 25F I get in the bag, hood on and draft collars cinched up. I put my zipped up jacket over my feet. Hat and wool socks are a must for me.
Blocking the wind/drafts gets more important the colder the temps get.
If you'll have a campfire - using a hot water bottle is a luxury I look forward to on cold nights.
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