because you feel too warm in -15 or less, then you're adapting. You do, however, seem to be getting along famously with the cold weather, so we'll say you're partly on the way to be being adapted.
Over here in New England, we've been getting some colder weather than usual. We've been waking up to -20C or below on several mornings. Up in the northern part of New Hampshire, it was -37C a few mornings ago. Brrrrr.