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December Weather in Sweetwater, United States

Last updated: June 24, 2025

In December, the average temperature in Sweetwater, United States hovers around 9°C (49°F). Temperatures can swing from a brisk -6°C (21°F) to a surprisingly warm 30°C (86°F). Expect about 23 mm (0.9 in) of precipitation over 3 days, and prepare for a high average humidity of 82%.

December Temperature in Sweetwater

In December in Sweetwater, the average temperature is 9°C (49°F), with maximums reaching 30°C (86°F) and minimums dropping as low as -6°C (21°F). Travelers should be prepared for a wide range of temperatures, from warm days to chilly nights.

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

The chart illustrates December temperature patterns in Sweetwater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sweetwater, December typically has an average temperature of 9°C (49°F), with highs reaching up to 30°C (86°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec444758647481848377655448
Data source: Temperature data for Sweetwater 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 Sweetwater

In Sweetwater in December, the precipitation amount is 23 mm (0.9 in) over the course of 3 days.

December Precipitation Trends in Sweetwater

The chart displays monthly precipitation patterns in Sweetwater, 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 Sweetwater, December typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec242350627646223560712523
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sweetwater

In Sweetwater in December, humidity is 82%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities less enjoyable and prompting travelers to seek warmth indoors or in cozy cafes.

December Average Humidity in Sweetwater

This chart illustrates the average monthly humidity levels in Sweetwater, 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 Sweetwater is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%74%66%70%75%79%78%71%69%70%82%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sweetwater

In Sweetwater 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 Sweetwater for better planning.

Maximum UV Index Levels in Sweetwater for December

The chart shows the monthly maximum UV Index (UVI) for Sweetwater 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 Sweetwater typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111112121111864
Data source: Sweetwater 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 Sweetwater Compares to Other Months

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

This table compares monthly weather conditions in Sweetwater, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)24 mm (0.9 inches)75%moderate
February Weather8°C (47°F)23 mm (0.9 inches)74%high
March Weather15°C (59°F)50 mm (2.0 inches)66%very high
April Weather18°C (65°F)62 mm (2.4 inches)70%extreme
May Weather23°C (74°F)76 mm (3.0 inches)75%extreme
June Weather27°C (81°F)46 mm (1.8 inches)79%extreme
July Weather29°C (84°F)22 mm (0.9 inches)78%extreme
August Weather28°C (84°F)35 mm (1.4 inches)71%extreme
September Weather25°C (77°F)60 mm (2.4 inches)69%extreme
October Weather19°C (66°F)70 mm (2.8 inches)70%very high
November Weather12°C (54°F)25 mm (1.0 inches)82%high
December Weather9°C (49°F)23 mm (0.9 inches)82%moderate

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