December Weather in Harlem, United States

Last updated: June 24, 2025

In Harlem, United States, the average temperature in December is a chilly -4°C (25°F), with extremes reaching as low as -33°C (-27°F) and peaking at a mild 19°C (67°F). Expect 19 mm (0.8 in) of precipitation over 5 days, contributing to an average humidity of an impressive 89%. Stay warm and prepared!

December Temperature in Harlem

In December in Harlem, the average temperature is -4°C (25°F). Maximums can reach 19°C (67°F), while minimums can drop to as low as -33°C (-27°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Harlem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harlem, December typically has an average temperature of -4°C (25°F), with highs reaching up to 19°C (67°F) and lows dropping to around -33°C (-27°F).

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

December Precipitation in Harlem

In Harlem in December, the total precipitation amount is 19 mm (0.8 in), occurring over the course of 5 days.

December Precipitation Trends in Harlem

The chart displays monthly precipitation patterns in Harlem, 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 Harlem, December typically receives around 19 mm (0.8 inches) of precipitation spread over approximately 5 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 Harlem

In Harlem in December humidity is 89%. With an average temperature of -4°C (25°F), this humidity feels like an intense chill that seeps into your bones, making traveling uncomfortable as you navigate through the damp, cold air.

December Average Humidity in Harlem

This chart illustrates the average monthly humidity levels in Harlem, 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 Harlem is approximately 89%, 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 Harlem

In Harlem in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Harlem, you can visit Hourly UV Index in Harlem.

Maximum UV Index Levels in Harlem for December

The chart shows the monthly maximum UV Index (UVI) for Harlem 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 Harlem typically reaches 2, which falls under the low exposure category.

Data source: Harlem 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 Harlem Compares to Other Months

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

This table compares monthly weather conditions in Harlem, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	11 mm (0.4 inches)	85%	low
February Weather	-9°C (16°F)	26 mm (1.0 inches)	90%	moderate
March Weather	-1°C (31°F)	22 mm (0.9 inches)	82%	moderate
April Weather	5°C (41°F)	26 mm (1.0 inches)	73%	high
May Weather	12°C (55°F)	38 mm (1.5 inches)	73%	very high
June Weather	18°C (65°F)	49 mm (1.9 inches)	72%	very high
July Weather	22°C (73°F)	10 mm (0.4 inches)	74%	very high
August Weather	21°C (69°F)	28 mm (1.1 inches)	71%	very high
September Weather	15°C (59°F)	43 mm (1.7 inches)	65%	high
October Weather	6°C (44°F)	24 mm (0.9 inches)	68%	moderate
November Weather	0°C (33°F)	28 mm (1.1 inches)	81%	moderate
December Weather	-4°C (25°F)	19 mm (0.8 inches)	89%	low