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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 3°C (39°F). Expect chilly lows, with temperatures dipping as low as -14°C (7°F), while the mercury can peak at a mild 19°C (66°F). Be prepared for some rain, as 115 mm (4.5 in) of precipitation is expected over 11 days. With an average humidity of 86%, you may want to pack accordingly for the damp conditions!

December Temperature in Marietta

In December in Marietta, the average temperature is 3°C (39°F). The maximum can reach 19°C (66°F), while the minimum can drop as low as -14°C (7°F). Travelers should prepare for a wide range of temperatures and pack accordingly for both chilly and mild weather.

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 3°C (39°F), with highs reaching up to 19°C (66°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec333745546472767470594438
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 total precipitation amount is 115 mm (4.5 in) spread over 11 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 115 mm (4.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9112111614614316412311010711686115
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 86%. With an average temperature of 3°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers for comfort while exploring.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
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 is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Marietta, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
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 Weather1°C (34°F)91 mm (3.6 inches)88%moderate
February Weather3°C (38°F)121 mm (4.8 inches)88%moderate
March Weather7°C (45°F)116 mm (4.6 inches)88%high
April Weather12°C (54°F)146 mm (5.7 inches)86%very high
May Weather18°C (65°F)143 mm (5.6 inches)82%very high
June Weather22°C (72°F)164 mm (6.5 inches)84%very high
July Weather25°C (76°F)122 mm (4.8 inches)82%very high
August Weather23°C (74°F)110 mm (4.3 inches)73%very high
September Weather21°C (70°F)107 mm (4.2 inches)73%very high
October Weather15°C (59°F)116 mm (4.6 inches)81%high
November Weather7°C (44°F)86 mm (3.4 inches)89%moderate
December Weather3°C (39°F)115 mm (4.5 inches)86%moderate

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