December Weather in Montvale, United States

Last updated: June 24, 2025

In Montvale, United States, the average temperature in December hovers around 4°C (40°F). During this time, you can expect minimum temperatures to plummet to -16°C (3°F), while the highs can reach a balmy 20°C (68°F). Be prepared for 101 mm (4.0 in) of precipitation spread over 8 days, contributing to an average humidity level of 85%.

December Temperature in Montvale

In December in Montvale, the average temperature is 4°C (40°F), with maximums reaching up to 20°C (68°F) and minimums dropping as low as -16°C (3°F). It's essential to pack layers to stay comfortable while exploring the diverse weather conditions.

December Weather in Montvale: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Montvale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Montvale, December typically has an average temperature of 4°C (40°F), with highs reaching up to 20°C (68°F) and lows dropping to around -16°C (3°F).

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

December Precipitation in Montvale

In Montvale in December, the precipitation amount is 101 mm (4.0 in) spread over 8 days.

December Precipitation Trends in Montvale

The chart displays monthly precipitation patterns in Montvale, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Montvale, December typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Montvale

In Montvale in December, humidity is 85%. With an average temperature of 4°C (40°F), this humidity feels like an icy blanket wrapping around you, making outdoor activities feel much colder and damp, which can be quite uncomfortable for traveling.

December Average Humidity in Montvale

This chart illustrates the average monthly humidity levels in Montvale, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Montvale is approximately 85%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Montvale

In Montvale in December, 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 Montvale, you can check the information here.

Maximum UV Index Levels in Montvale for December

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

Data source: Montvale December 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 December Weather in Montvale Compares to Other Months

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

This table compares monthly weather conditions in Montvale, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	73 mm (2.9 inches)	84%	moderate
February Weather	5°C (41°F)	111 mm (4.4 inches)	84%	high
March Weather	8°C (47°F)	77 mm (3.0 inches)	84%	very high
April Weather	13°C (56°F)	129 mm (5.1 inches)	82%	very high
May Weather	18°C (65°F)	137 mm (5.4 inches)	82%	very high
June Weather	22°C (72°F)	108 mm (4.2 inches)	83%	extreme
July Weather	25°C (77°F)	60 mm (2.4 inches)	79%	very high
August Weather	23°C (75°F)	102 mm (4.0 inches)	77%	very high
September Weather	21°C (69°F)	106 mm (4.2 inches)	75%	very high
October Weather	15°C (60°F)	117 mm (4.6 inches)	81%	high
November Weather	7°C (45°F)	80 mm (3.2 inches)	87%	moderate
December Weather	4°C (40°F)	101 mm (4.0 inches)	85%	moderate