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December Weather in Jefferson, United States

Last updated: June 24, 2025

In Jefferson, United States, the average temperature in December hovers around 3°C (38°F), with extremes ranging from a brisk -14°C (6°F) to a pleasant 20°C (68°F). You can expect 107 mm (4.2 in) of precipitation spread over 11 days, complemented by a high average humidity of 86%. Prepare for a cool, damp atmosphere as you explore this unique locale!

December Temperature in Jefferson

In December in Jefferson, the average temperature is 3°C (38°F). The maximum can reach 20°C (68°F), while the minimum can drop as low as -14°C (6°F). Travelers should prepare for a wide range of temperatures and pack accordingly.

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 3°C (38°F), with highs reaching up to 20°C (68°F) and lows dropping to around -14°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec344044526066706864564238
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 107 mm (4.2 in) spread over a period of 11 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 107 mm (4.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec8812911214314013210313312613076107
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 86%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps through your layers, making traveling uncomfortable as breath clouds visibly in the crisp air.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
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 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 Jefferson, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468111111111110863
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 Weather1°C (34°F)88 mm (3.5 inches)87%moderate
February Weather4°C (40°F)129 mm (5.1 inches)87%high
March Weather7°C (44°F)112 mm (4.4 inches)86%very high
April Weather11°C (52°F)143 mm (5.6 inches)84%extreme
May Weather16°C (61°F)140 mm (5.5 inches)83%extreme
June Weather19°C (66°F)132 mm (5.2 inches)83%extreme
July Weather21°C (70°F)103 mm (4.0 inches)79%extreme
August Weather20°C (69°F)133 mm (5.2 inches)66%extreme
September Weather18°C (65°F)126 mm (5.0 inches)68%very high
October Weather13°C (56°F)130 mm (5.1 inches)78%very high
November Weather6°C (42°F)76 mm (3.0 inches)89%high
December Weather3°C (38°F)107 mm (4.2 inches)86%moderate

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