January Weather in Denville, United States

Last updated: June 24, 2025

In Denville, United States, the average temperature in January hovers around -1°C (31°F), creating a crisp atmosphere. While the mercury can dip as low as -18°C (0°F), it can also rise to a pleasant 18°C (64°F). Expect 72 mm (2.8 in) of precipitation spread over 8 days, and be prepared for high humidity levels at 84%, making it an interesting month for weather enthusiasts!

January Temperature in Denville

In January in Denville, the average temperature is -1°C (31°F), with a maximum that can reach 18°C (64°F) and a minimum that can drop as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures, from chilly to mild, by packing accordingly.

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

The chart illustrates January temperature patterns in Denville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Denville, January typically has an average temperature of -1°C (31°F), with highs reaching up to 18°C (64°F) and lows dropping to around -18°C (0°F).

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

January Precipitation in Denville

In Denville in January, the precipitation amount is 72 mm (2.8 in) over the course of 8 days.

January Precipitation Trends in Denville

The chart displays monthly precipitation patterns in Denville, 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 Denville, January typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 8 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 Denville

In Denville in January humidity is 84%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through layers of clothing, making outdoor excursions brisk and invigorating, yet challenging for those unaccustomed to such damp conditions.

January Average Humidity in Denville

This chart illustrates the average monthly humidity levels in Denville, 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 Denville is approximately 84%, 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 Denville

In Denville 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 Denville, you can check the information here.

Maximum UV Index Levels in Denville for January

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

Data source: Denville 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 Denville Compares to Other Months

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

This table compares monthly weather conditions in Denville, 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 (31°F)	72 mm (2.8 inches)	84%	moderate
February Weather	1°C (34°F)	101 mm (4.0 inches)	82%	moderate
March Weather	4°C (39°F)	97 mm (3.8 inches)	81%	high
April Weather	10°C (50°F)	117 mm (4.6 inches)	78%	very high
May Weather	16°C (60°F)	137 mm (5.4 inches)	69%	very high
June Weather	21°C (70°F)	102 mm (4.0 inches)	69%	very high
July Weather	24°C (76°F)	142 mm (5.6 inches)	62%	very high
August Weather	23°C (74°F)	136 mm (5.4 inches)	65%	very high
September Weather	19°C (67°F)	111 mm (4.4 inches)	68%	very high
October Weather	14°C (57°F)	143 mm (5.6 inches)	74%	high
November Weather	6°C (43°F)	90 mm (3.5 inches)	82%	moderate
December Weather	2°C (35°F)	112 mm (4.4 inches)	80%	low