I ride soon in march & april and late in november , coldest -3ºC to 10ºC. I try to came back home before sunset, when sun going down temperature become too cold -5 = risky & dangerous !
Nice - that's cold enough! similar temps here, typical low 20F (done teens before, the R1100RS make cold a little easier).
Add some barkbusters, very helpful to knock some of the wind (& rain!) down.
The gloves look nice - I'll keep em in mind (got some insulated Olympia's w/ GoreTex that work ok but I don't love).