In December the weather deteriorated and complicated night operations. II./KG 55 participated in 11 attacks during the month with all 30 of its aircraft available. air groups were assigned to V "Fliegerkorps" in December attached to "Luftflotte" 3. During an attack Bristol on the night of the 24 November the "Geschwader" suffered its first casualty when a crew member was killed by anti-aircraft fire, but KG 55 suffered few casualties during the winter operations. The crews were ordered to expand their duties this time and report back on weather conditions for successive waves. A particular problem was the icing of airframes at higher altitudes. The radio operators were obliged to report straight away and used the W/T to do so. British Y-stations were able to intercept the transmissions which helped identify the unit but little more. Notable operations were carried out against Sheffield on 12/13 December and Liverpool on 21/22 December. On two successive nights from the 22–24 December, KG 55 supported the heavy bombing of Manchester and Plymouth. III./KG 55 is known to have attacked Birmingham alone this night.