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I slept in mine in the cold on the weekend of the 21st/22nd. It was about -15c (about 5f), which is standard for Canada at the time.
Buy a good underquilt. If you find you're cold, check if the surface of it that sits against your hammock is warm. If it's not, then the quilt is probably letting off heat and you should tie it to your hammock. Also bring a spare wool blanket and lay it underneath you (either ontop of your hammock or between it and your underquilt.