As the year begins to grow dark, now is the time to reflect. Study, learn, and grow quiet in your knowledge. Active workings are not recommended in winter unless they are meant to manifest in spring. You may find that some angels are scarce this time of year while others appear out of the blue everyday.
In this time of renewel and twilight there are a few angels that tend to show up. Raziel, Ramiel, Cassiel, Ariel, Leliel, and Camael to name a few. Even through Ariel and Cameal aren't particularly winter angels, they govern the energies of nature. So it stands that they remain throughout the turning of the wheel of the year. I am sure that the angels of winter will also be busy and active as the time draws near.