January Weather in DeKalb, United States

Last updated: June 24, 2025

In DeKalb, United States during January, the average temperature hovers around -5°C (24°F), with extremes ranging from a bone-chilling -32°C (-25°F) to a mild 14°C (57°F). Expect about 60 mm (2.4 in) of precipitation over 7 days, contributing to a high average humidity of 82% that adds a layer of chill to the air.

January Temperature in DeKalb

In January in DeKalb, the average temperature is -5°C (24°F). The maximum can reach 14°C (57°F), while the minimum can plummet to as low as -32°C (-25°F). It's essential to be prepared for extreme temperature variations if you're planning to travel during this time.

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

The chart illustrates January temperature patterns in DeKalb, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In DeKalb, January typically has an average temperature of -5°C (24°F), with highs reaching up to 14°C (57°F) and lows dropping to around -32°C (-25°F).

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

January Precipitation in DeKalb

In DeKalb in January, the precipitation amount is 60 mm (2.4 in) over the course of 7 days.

January Precipitation Trends in DeKalb

The chart displays monthly precipitation patterns in DeKalb, 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 DeKalb, January typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 7 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 DeKalb

In DeKalb in January humidity is 82%. With an average temperature of -5°C (24°F), this humidity feels like an icy shroud enveloping you, making every breath a sharp reminder of the cold as moisture clings to your skin, potentially turning your travel experience into a balance between breathtaking winter scenery and the biting chill that is exacerbated by the dampness in the air.

January Average Humidity in DeKalb

This chart illustrates the average monthly humidity levels in DeKalb, 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 DeKalb 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 DeKalb

In DeKalb 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 DeKalb, you can check the information here.

Maximum UV Index Levels in DeKalb for January

The chart shows the monthly maximum UV Index (UVI) for DeKalb 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 DeKalb typically reaches 3, which falls under the moderate exposure category.

Data source: DeKalb 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 DeKalb Compares to Other Months

Weather in DeKalb varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in DeKalb, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in DeKalb, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	60 mm (2.4 inches)	82%	moderate
February Weather	-4°C (26°F)	58 mm (2.3 inches)	83%	moderate
March Weather	4°C (39°F)	78 mm (3.1 inches)	84%	high
April Weather	9°C (48°F)	111 mm (4.4 inches)	85%	very high
May Weather	16°C (61°F)	169 mm (6.7 inches)	79%	very high
June Weather	22°C (72°F)	128 mm (5.1 inches)	82%	very high
July Weather	24°C (75°F)	88 mm (3.5 inches)	80%	very high
August Weather	22°C (73°F)	83 mm (3.3 inches)	81%	very high
September Weather	19°C (67°F)	107 mm (4.2 inches)	80%	very high
October Weather	12°C (54°F)	122 mm (4.8 inches)	82%	high
November Weather	3°C (38°F)	52 mm (2.0 inches)	88%	moderate
December Weather	0°C (32°F)	49 mm (1.9 inches)	84%	low