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December Weather in Marietta, United States

Last updated: June 24, 2025

In December, the average temperature in Marietta, United States hovers around 9°C (49°F), with extremes ranging from a chilly -7°C (19°F) to a warmer 26°C (79°F). Expect 57 mm (2.2 in) of precipitation over about 6 days, contributing to an average humidity of 87%. Prepare for a mix of brisk air and potential rain!

December Temperature in Marietta

In December in Marietta, the average temperature is 9°C (49°F), with maximums reaching up to 26°C (79°F) and minimums dropping as low as -7°C (19°F). Travelers should be prepared for a range of temperatures, so dressing in layers is advisable.

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

The chart illustrates December temperature patterns in Marietta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marietta, December typically has an average temperature of 9°C (49°F), with highs reaching up to 26°C (79°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec434657637280848377655448
Data source: Temperature data for Marietta 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 Marietta

In Marietta in December, the precipitation amount is 57 mm (2.2 in) over a span of 6 days.

December Precipitation Trends in Marietta

The chart displays monthly precipitation patterns in Marietta, 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 Marietta, December typically receives around 57 mm (2.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec6184959612210348941021385157
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Marietta

In Marietta in December humidity is 87%. With an average temperature of 9°C (49°F), this humidity feels like a damp blanket wrapping around you, making travel uncomfortable and leaving you yearning for a dry breeze to refresh your spirit.

December Average Humidity in Marietta

This chart illustrates the average monthly humidity levels in Marietta, 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 Marietta is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Marietta

In Marietta 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 Marietta for better planning.

Maximum UV Index Levels in Marietta for December

The chart shows the monthly maximum UV Index (UVI) for Marietta 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 Marietta typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Marietta 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 Marietta Compares to Other Months

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

This table compares monthly weather conditions in Marietta, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)61 mm (2.4 inches)80%moderate
February Weather8°C (46°F)84 mm (3.3 inches)79%high
March Weather14°C (58°F)95 mm (3.7 inches)78%very high
April Weather17°C (63°F)96 mm (3.8 inches)78%very high
May Weather22°C (73°F)122 mm (4.8 inches)81%extreme
June Weather27°C (80°F)103 mm (4.1 inches)78%extreme
July Weather29°C (84°F)48 mm (1.9 inches)73%extreme
August Weather28°C (83°F)94 mm (3.7 inches)66%extreme
September Weather25°C (77°F)102 mm (4.0 inches)65%very high
October Weather18°C (65°F)138 mm (5.4 inches)72%very high
November Weather12°C (54°F)50 mm (2.0 inches)82%high
December Weather9°C (49°F)57 mm (2.2 inches)87%moderate

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