January Weather in Morristown, United States

Last updated: June 24, 2025

In Morristown, United States, the average temperature in January hovers around 0°C (33°F). Temperatures can dip to a chilling -17°C (2°F), while reaching a maximum of 18°C (65°F). Expect about 70 mm (2.7 in) of precipitation spread over 8 days, contributing to the region's average humidity of 84%.

January Temperature in Morristown

In January in Morristown, the average temperature is 0°C (33°F). Maximums can reach 18°C (65°F), while minimums can drop as low as -17°C (2°F). It's essential to pack layers and be prepared for fluctuating temperatures while exploring the beautiful surroundings.

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

The chart illustrates January temperature patterns in Morristown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Morristown, January typically has an average temperature of 0°C (33°F), with highs reaching up to 18°C (65°F) and lows dropping to around -17°C (2°F).

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

January Precipitation in Morristown

In Morristown in January, the precipitation amount is 70 mm (2.7 in) spread over 8 days.

January Precipitation Trends in Morristown

The chart displays monthly precipitation patterns in Morristown, 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 Morristown, January typically receives around 70 mm (2.7 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 Morristown

In Morristown in January humidity is 84%. With average temperature 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures less enjoyable and travel plans challenging.

January Average Humidity in Morristown

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

In Morristown 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 Morristown, you can check the information here.

Maximum UV Index Levels in Morristown for January

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

Data source: Morristown 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 Morristown Compares to Other Months

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

This table compares monthly weather conditions in Morristown, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	70 mm (2.7 inches)	84%	moderate
February Weather	2°C (36°F)	104 mm (4.1 inches)	82%	moderate
March Weather	5°C (41°F)	103 mm (4.1 inches)	81%	high
April Weather	11°C (52°F)	116 mm (4.6 inches)	78%	very high
May Weather	16°C (62°F)	135 mm (5.3 inches)	69%	very high
June Weather	21°C (71°F)	106 mm (4.2 inches)	69%	very high
July Weather	25°C (77°F)	142 mm (5.6 inches)	62%	very high
August Weather	24°C (75°F)	136 mm (5.4 inches)	65%	very high
September Weather	20°C (69°F)	101 mm (4.0 inches)	68%	very high
October Weather	15°C (59°F)	142 mm (5.6 inches)	74%	high
November Weather	7°C (44°F)	86 mm (3.4 inches)	82%	moderate
December Weather	3°C (37°F)	113 mm (4.4 inches)	80%	low