December Weather in Frederick, United States

Last updated: June 24, 2025

In December, the average temperature in Frederick, United States hovers around 0°C (33°F), with minimums plunging to -19°C (-2°F) and occasional highs reaching 22°C (71°F). Expect 14 mm (0.6 in) of precipitation over about 3 days, while the air remains notably damp with an average humidity of 89%.

December Temperature in Frederick

In December in Frederick, the average temperature is 0°C (33°F). Maximums can reach 22°C (71°F), while minimums can drop as low as -19°C (-2°F). Be sure to pack for a wide range of temperatures to ensure a comfortable travel experience.

December Weather in Frederick: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Frederick, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Frederick, December typically has an average temperature of 0°C (33°F), with highs reaching up to 22°C (71°F) and lows dropping to around -19°C (-2°F).

Data source: Temperature data for Frederick generated using information from the Copernicus Climate Change Service.

December Precipitation in Frederick

In Frederick in December, the precipitation amount is 14 mm (0.6 in) accumulated over the course of 3 days.

December Precipitation Trends in Frederick

The chart displays monthly precipitation patterns in Frederick, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Frederick, December typically receives around 14 mm (0.6 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Frederick

In Frederick in December humidity is 89%. With an average temperature of 0°C (33°F), this humidity feels like a heavy, damp blanket that clings to your skin, making travel uncomfortable and every breath seem colder and more constricted.

December Average Humidity in Frederick

This chart illustrates the average monthly humidity levels in Frederick, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Frederick is approximately 89%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Frederick

In Frederick in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Frederick for better planning.

Maximum UV Index Levels in Frederick for December

The chart shows the monthly maximum UV Index (UVI) for Frederick in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Frederick typically reaches 4, which falls under the moderate exposure category.

Data source: Frederick December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Frederick Compares to Other Months

Weather in Frederick varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Frederick, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Frederick, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	21 mm (0.8 inches)	88%	moderate
February Weather	-2°C (30°F)	27 mm (1.1 inches)	87%	high
March Weather	4°C (40°F)	55 mm (2.2 inches)	81%	very high
April Weather	9°C (48°F)	56 mm (2.2 inches)	76%	extreme
May Weather	13°C (56°F)	109 mm (4.3 inches)	66%	extreme
June Weather	20°C (69°F)	46 mm (1.8 inches)	58%	extreme
July Weather	23°C (74°F)	35 mm (1.4 inches)	52%	extreme
August Weather	22°C (73°F)	41 mm (1.6 inches)	56%	extreme
September Weather	19°C (66°F)	28 mm (1.1 inches)	65%	very high
October Weather	9°C (49°F)	37 mm (1.5 inches)	76%	high
November Weather	5°C (40°F)	24 mm (0.9 inches)	82%	moderate
December Weather	0°C (33°F)	14 mm (0.6 inches)	89%	moderate