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December Weather in Jefferson, United States

Last updated: June 24, 2025

In December, the average temperature in Jefferson, United States hovers around 9°C (49°F). However, be prepared for a range of temperatures: it can dip to a chilling -7°C (19°F) or rise to a warm 27°C (80°F). Rain is also part of the equation, with 131 mm (5.2 in) of precipitation expected over 9 days, contributing to an average humidity of 87%. Stay dry and cozy during your visit!

December Temperature in Jefferson

In December in Jefferson, the average temperature is 9°C (49°F). The maximum can reach 27°C (80°F) and the minimum can be as low as -7°C (19°F). Be prepared for a wide range of temperatures when traveling during this month in Jefferson.

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

The chart illustrates December temperature patterns in Jefferson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jefferson, December typically has an average temperature of 9°C (49°F), with highs reaching up to 27°C (80°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec455155637277807975665248
Data source: Temperature data for Jefferson 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 Jefferson

In Jefferson in December, the precipitation amount is 131 mm (5.2 in) over the course of 9 days.

December Precipitation Trends in Jefferson

The chart displays monthly precipitation patterns in Jefferson, 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 Jefferson, December typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec96120821081191171181321397580131
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Jefferson

In Jefferson 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 Jefferson

This chart illustrates the average monthly humidity levels in Jefferson, 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 Jefferson is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Jefferson

In Jefferson 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 Jefferson for better planning.

Maximum UV Index Levels in Jefferson for December

The chart shows the monthly maximum UV Index (UVI) for Jefferson 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 Jefferson typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109864
Data source: Jefferson 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 Jefferson Compares to Other Months

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

This table compares monthly weather conditions in Jefferson, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (46°F)96 mm (3.8 inches)86%moderate
February Weather10°C (51°F)120 mm (4.7 inches)85%high
March Weather13°C (55°F)82 mm (3.2 inches)84%very high
April Weather17°C (63°F)108 mm (4.2 inches)82%very high
May Weather22°C (72°F)119 mm (4.7 inches)83%extreme
June Weather25°C (77°F)117 mm (4.6 inches)82%extreme
July Weather27°C (80°F)118 mm (4.6 inches)80%extreme
August Weather26°C (79°F)132 mm (5.2 inches)74%very high
September Weather24°C (75°F)139 mm (5.5 inches)75%very high
October Weather19°C (66°F)75 mm (2.9 inches)79%very high
November Weather11°C (53°F)80 mm (3.2 inches)87%high
December Weather9°C (49°F)131 mm (5.2 inches)87%moderate

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