Christmas travel could be challenging across parts of the U.S. this weekend as rain, snow, and temperature swings affect major regions. Friday brings the biggest concerns, with unsettled weather in the Pacific Northwest, Great Lakes, and Northeast, raising the risk of road hazards and flight delays. Saturday looks quieter for most travelers, while Sunday and Monday may see renewed rain and mountain snow in the West and scattered impacts in the East and South. Travelers should plan extra time and monitor conditions closely.