1. As winter conditions approached the 486th Bomb Group began to experience the effects of winter weather on operational missions. 2. Although weather was not the only factor it was the main one that caused the number of missions flown to drop to 11 for the 30 days of the month. 3. Nearly 22% (3 occasions) of the missions for which briefings were held were scrubbed after briefing. 4. 10 of the 11 missions flown were PFF and several times the secondary or last resort target was bombed because the primary had too many clouds. 5. All of the frontal systems that passed the base area during this month were moving from west to east. They were usually of an old type and usually passed as occlusions. 6. Practically every front had the majority of its frontal weather ahead of it, and the frontal passages were usually followed by broken skies with scattered showers. 7. Icing did not constitute a problem during the month. 8. Fog and contrails became increasing problems to be reckoned with - affecting takeoff times, assembly and route altitudes.