Twenty-five degrees for one hour might be the limit of my endurance for cold weather riding. I enjoyed how crisp and clear everything was, but unfortunately came back to fork seal fluid all over my front tire and left boot. Before I bought the bike, it sat for three and a half years, getting only 1800 miles of use. I am guessing that sort of thing tends to dry out parts that should be more elastic.
I ended up needing pretty much every jacket in the packet.