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December Weather in Frederick, United States

Last updated: June 24, 2025

In Frederick, United States, the average temperature in December hovers around 8°C (46°F), with a notable range that can dip as low as -8°C (18°F) and soar up to 30°C (85°F). Expect 29 mm (1.1 in) of precipitation spread over 3 days, contributing to the average humidity of 84%. This combination creates a uniquely dynamic atmosphere, perfect for those who appreciate a variety of weather conditions.

December Temperature in Frederick

In December in Frederick, the average temperature is 8°C (46°F). The maximum can reach 30°C (85°F), and the minimum can be as low as -8°C (18°F). Be prepared for a wide range of temperatures when traveling to Frederick during this month, as it can fluctuate significantly.

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 8°C (46°F), with highs reaching up to 30°C (85°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec414356627281858477645246
Data source: Temperature data for Frederick generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Frederick

In Frederick in December, the precipitation amount is 29 mm (1.1 in) 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 29 mm (1.1 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec3530699811558283786692229
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Frederick

In Frederick in December humidity is 84%. With an average temperature of 8°C (46°F), this humidity feels like a chilly mist wrapping around you, making outdoor exploration cumbersome and layering your clothing a necessity for comfort.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%76%70%72%82%82%80%72%64%71%81%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110854
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.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)35 mm (1.4 inches)76%moderate
February Weather6°C (43°F)30 mm (1.2 inches)76%high
March Weather13°C (56°F)69 mm (2.7 inches)70%very high
April Weather17°C (62°F)98 mm (3.9 inches)72%very high
May Weather22°C (72°F)115 mm (4.5 inches)82%extreme
June Weather27°C (81°F)58 mm (2.3 inches)82%extreme
July Weather29°C (85°F)28 mm (1.1 inches)80%extreme
August Weather29°C (84°F)37 mm (1.5 inches)72%extreme
September Weather25°C (77°F)86 mm (3.4 inches)64%very high
October Weather18°C (64°F)69 mm (2.7 inches)71%very high
November Weather11°C (52°F)22 mm (0.9 inches)81%moderate
December Weather8°C (46°F)29 mm (1.1 inches)84%moderate

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