January Weather in Jefferson, United States

Last updated: June 24, 2025

In January, the average temperature in Jefferson, United States is a brisk 1°C (34°F). Expect it to dip as low as -19°C (-1°F), while highs can reach a mild 20°C (68°F). Prepare for 88 mm (3.5 in) of precipitation over about 12 days, and don't forget your umbrella, as humidity levels hover around a notable 87%.

January Temperature in Jefferson

In January in Jefferson, the average temperature is 1°C (34°F). Maximum temperatures can reach 20°C (68°F), while minimums can drop as low as -19°C (-1°F). It's advisable to pack both warm clothing and lighter layers for a comfortable trip.

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 1°C (34°F), with highs reaching up to 20°C (68°F) and lows dropping to around -19°C (-1°F).

Data source: Temperature data for Jefferson generated using information from the Copernicus Climate Change Service.

January Precipitation in Jefferson

In Jefferson in January, the precipitation amount is 88 mm (3.5 in) over a span of 12 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 88 mm (3.5 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Jefferson

In Jefferson in January humidity is 87%. With an average temperature of 1°C (34°F), this humidity feels like a chilling blanket enveloping you, making every step outside feel heavy and damp, and leaving you longing for warmth and comfort while traveling.

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 87%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	88 mm (3.5 inches)	87%	moderate
February Weather	4°C (40°F)	129 mm (5.1 inches)	87%	high
March Weather	7°C (44°F)	112 mm (4.4 inches)	86%	very high
April Weather	11°C (52°F)	143 mm (5.6 inches)	84%	extreme
May Weather	16°C (61°F)	140 mm (5.5 inches)	83%	extreme
June Weather	19°C (66°F)	132 mm (5.2 inches)	83%	extreme
July Weather	21°C (70°F)	103 mm (4.0 inches)	79%	extreme
August Weather	20°C (69°F)	133 mm (5.2 inches)	66%	extreme
September Weather	18°C (65°F)	126 mm (5.0 inches)	68%	very high
October Weather	13°C (56°F)	130 mm (5.1 inches)	78%	very high
November Weather	6°C (42°F)	76 mm (3.0 inches)	89%	high
December Weather	3°C (38°F)	107 mm (4.2 inches)	86%	moderate