January Weather in Jefferson, United States

Last updated: June 24, 2025

In January, the average temperature in Jefferson, United States hovers around -6°C (22°F). Expect a chilling range, with minimum temperatures dipping to -29°C (-20°F) and occasionally peaking at a maximum of 13°C (56°F). During this month, precipitation totals about 31 mm (1.2 in) over 6 days, while the average humidity remains a brisk 78%.

January Temperature in Jefferson

In January, in Jefferson, the average temperature is -6°C (22°F). Maximums can reach 13°C (56°F), while minimums can drop as low as -29°C (-20°F). Travelers should be prepared for a range of temperatures, from chilly days to very cold nights.

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 -6°C (22°F), with highs reaching up to 13°C (56°F) and lows dropping to around -29°C (-20°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 31 mm (1.2 in) over a span of 6 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 31 mm (1.2 inches) of precipitation spread over approximately 6 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Jefferson

In Jefferson in January, humidity is 78%. With an average temperature of -6°C (22°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities less enjoyable and creating a sharp contrast that can be unexpectedly uncomfortable for travelers.

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 78%, 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 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 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 3, 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	-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 Weather	4°C (39°F)	76 mm (3.0 inches)	77%	moderate
April Weather	9°C (49°F)	64 mm (2.5 inches)	77%	very high
May Weather	16°C (62°F)	163 mm (6.4 inches)	77%	very high
June Weather	23°C (74°F)	104 mm (4.1 inches)	81%	extreme
July Weather	25°C (77°F)	76 mm (3.0 inches)	81%	very high
August Weather	23°C (73°F)	94 mm (3.7 inches)	77%	very high
September Weather	20°C (68°F)	100 mm (3.9 inches)	73%	very high
October Weather	11°C (52°F)	120 mm (4.7 inches)	75%	high
November Weather	3°C (38°F)	36 mm (1.4 inches)	85%	moderate
December Weather	-1°C (30°F)	37 mm (1.5 inches)	83%	moderate