Environmental specifications are a "guarantee" that your equipment will work as expected in the given environment. If you have any problems outside of that range, you were forewarned by the manufacturer.

That said, I have used my DSLR (Nikon D7000) down to -20°C (-5°F) for full days. I have also used this camera in -6 to 4°C (20 to 40°F) for 2 weeks while camping without issue. No attempt was made to keep the camera warm. Specifications for my camera are 0 to +40°C. On the other extreme, I have operated my camera above 40°C.
Not listed in the specifications is air speed. The external dust seal on my Nikon lens didn't fair too well, coming undone at 120 knot air speed.

I suggest starting out with a fully charged battery since battery life is reduced when the battery is cold. If you do a lot of shooting or take time exposures (aurora shots), it is wise to have a spare battery in an inner jacket pocket to keep it warm.

Unless someone can vouch for this camera, you'll need to take your chances that it will work in cold temperatures. I have a feeling that you'll be OK.
Cold temperatures won't damage the camera, but could have problems with the electronics and/or lens lubricants when cold. Electronics (unrelated to cameras) I take down to failure at -35°C come back to life when warmed up to -20°C.
As you are aware of, be sure to bag your camera before entering a building to prevent condensation. It takes about 45 minutes for the camera to come up to temperature.