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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 -1°C (30°F), with the potential for extremes ranging from a chilly -23°C (-9°F) to a warm 22°C (72°F). Expect about 37 mm (1.5 in) of precipitation spread over 4 days, contributing to an average humidity level of 83%. Prepare for a variety of weather conditions during this captivating month!

December Temperature in Jefferson

In December in Jefferson, the average temperature is -1°C (30°F), with maximums reaching 22°C (72°F) and minimums dropping as low as -23°C (-9°F). This wide temperature range means visitors should be well-prepared for both chilly and mild weather while exploring.

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 -1°C (30°F), with highs reaching up to 22°C (72°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec222339486274767368523830
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 37 mm (1.5 in) over the course of 4 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 37 mm (1.5 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec3139766416410476941001203637
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 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35589111098643
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 Weather-6°C (22°F)31 mm (1.2 inches)78%moderate
February Weather-5°C (23°F)39 mm (1.5 inches)80%moderate
March Weather4°C (39°F)76 mm (3.0 inches)77%moderate
April Weather9°C (49°F)64 mm (2.5 inches)77%very high
May Weather16°C (62°F)163 mm (6.4 inches)77%very high
June Weather23°C (74°F)104 mm (4.1 inches)81%extreme
July Weather25°C (77°F)76 mm (3.0 inches)81%very high
August Weather23°C (73°F)94 mm (3.7 inches)77%very high
September Weather20°C (68°F)100 mm (3.9 inches)73%very high
October Weather11°C (52°F)120 mm (4.7 inches)75%high
November Weather3°C (38°F)36 mm (1.4 inches)85%moderate
December Weather-1°C (30°F)37 mm (1.5 inches)83%moderate

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