December in Maryland typically brings a transition from late autumn to winter, characterized by decreasing temperatures, increased precipitation, and occasional snowfall. Average highs range from the low 40s Fahrenheit (around 5 degrees Celsius) in the western mountainous regions to the upper 40s Fahrenheit (around 9 degrees Celsius) in the eastern coastal plains. Average lows range from the upper 20s Fahrenheit (around -2 degrees Celsius) in the west to the low 30s Fahrenheit (around 0 degrees Celsius) in the east. Precipitation, often a mix of rain and snow, averages around 3 to 4 inches statewide.
Understanding the typical climatic conditions of this period is crucial for residents, visitors, and businesses. Preparation for potential winter weather hazards, such as snowstorms and icy conditions, is essential for safety and minimizing disruptions. Historical weather data reveals patterns of temperature fluctuations and precipitation trends, informing long-term planning and decision-making in various sectors, including agriculture, transportation, and tourism. The shift in weather also marks the beginning of the holiday season, influencing social activities and cultural events.