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January Weather in Jefferson, United States

Last updated: June 24, 2025

The average temperature in Jefferson, United States during January is 7°C (46°F). Be prepared for a temperature range that can dip as low as -11°C (12°F) and rise up to 26°C (79°F). Expect precipitation of 96 mm (3.8 in) across approximately 9 days, along with a high average humidity of 86%.

January Temperature in Jefferson

In January in Jefferson, the average temperature is 7°C (46°F), with maximums reaching 26°C (79°F) and minimums dipping as low as -11°C (12°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates January 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, January typically has an average temperature of 7°C (46°F), with highs reaching up to 26°C (79°F) and lows dropping to around -11°C (12°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.

January Precipitation in Jefferson

In Jefferson in January, the total precipitation amount is 96 mm (3.8 in) spread over a period of 9 days.

January Precipitation Trends in Jefferson

The chart displays monthly precipitation patterns in Jefferson, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Jefferson, January typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec96120821081191171181321397580131
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Jefferson

In Jefferson in January humidity is 86%. With an average temperature of 7°C (46°F), this humidity feels like wrapping yourself in a damp blanket, making travel uncomfortable and heavy, as the cold air mixes with the muggy atmosphere, leaving you longing for a warm, dry refuge.

January Average Humidity in Jefferson

This chart illustrates the average monthly humidity levels in Jefferson, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Jefferson is approximately 86%, 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 January generated using information from the Copernicus Climate Change Service.

January UV Index in Jefferson

In Jefferson in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Jefferson in January, 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 January, the maximum UV index in Jefferson typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109864
Data source: Jefferson January 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 January 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 January’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 January’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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