January Weather in Jefferson, United States

Last updated: June 24, 2025

In January, the average temperature in Jefferson, United States hovers around 9°C (48°F), with min temperatures dipping as low as -15°C (6°F) and peaking at a comfortable 26°C (79°F). Expect around 105 mm (4.1 in) of precipitation over about 9 days, and be prepared for a high average humidity of 82%.

January Temperature in Jefferson

In January in Jefferson, the average temperature is 9°C (48°F), with maximums reaching up to 26°C (79°F) and minimums dropping as low as -15°C (6°F). Be prepared for a range of weather conditions when traveling to Jefferson during this month.

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 9°C (48°F), with highs reaching up to 26°C (79°F) and lows dropping to around -15°C (6°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 total precipitation amount reaches 105 mm (4.1 in) over the course 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 105 mm (4.1 inches) of precipitation spread over approximately 9 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 82%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers for your travels while keeping an umbrella handy for unexpected drizzles.

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 82%, 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	9°C (48°F)	105 mm (4.1 inches)	82%	moderate
February Weather	10°C (51°F)	149 mm (5.9 inches)	80%	high
March Weather	16°C (61°F)	123 mm (4.9 inches)	78%	very high
April Weather	18°C (65°F)	170 mm (6.7 inches)	79%	very high
May Weather	23°C (74°F)	156 mm (6.1 inches)	81%	extreme
June Weather	27°C (81°F)	102 mm (4.0 inches)	77%	extreme
July Weather	29°C (84°F)	90 mm (3.5 inches)	72%	extreme
August Weather	29°C (84°F)	80 mm (3.2 inches)	65%	extreme
September Weather	26°C (79°F)	92 mm (3.6 inches)	63%	very high
October Weather	20°C (68°F)	99 mm (3.9 inches)	70%	very high
November Weather	13°C (56°F)	59 mm (2.3 inches)	82%	high
December Weather	11°C (52°F)	125 mm (4.9 inches)	88%	moderate