December Weather in Harlem, United States

Last updated: June 24, 2025

In December, the average temperature in Harlem, United States hovers around 11°C (51°F). Expect a wide range, with minimums dipping to -5°C (24°F) and maximums rising to 28°C (82°F). This month sees 117 mm (4.6 in) of precipitation spread over approximately 11 days, contributing to a high average humidity of 87%.

December Temperature in Harlem

In December in Harlem, the average temperature is 11°C (51°F), with maximums reaching 28°C (82°F) and minimums dropping as low as -5°C (24°F). This diverse range of temperatures makes Harlem an appealing destination for travelers seeking both mild and cooler weather experiences.

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 11°C (51°F), with highs reaching up to 28°C (82°F) and lows dropping to around -5°C (24°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 reaches 117 mm (4.6 in) over the course of 11 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 117 mm (4.6 inches) of precipitation spread over approximately 11 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Harlem

In Harlem in December humidity is 87%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill wrapping around you, making outdoor excursions a bit uncomfortable as the air feels thick and heavy, urging you to seek shelter more often than not.

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 87%, 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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Harlem for better planning.

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 4, which falls under the moderate 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	9°C (49°F)	87 mm (3.4 inches)	86%	moderate
February Weather	12°C (54°F)	118 mm (4.6 inches)	81%	high
March Weather	15°C (59°F)	82 mm (3.2 inches)	81%	very high
April Weather	19°C (66°F)	106 mm (4.2 inches)	79%	very high
May Weather	23°C (74°F)	106 mm (4.2 inches)	75%	extreme
June Weather	26°C (79°F)	109 mm (4.3 inches)	75%	extreme
July Weather	28°C (82°F)	113 mm (4.4 inches)	80%	extreme
August Weather	27°C (81°F)	125 mm (4.9 inches)	81%	very high
September Weather	25°C (78°F)	81 mm (3.2 inches)	83%	very high
October Weather	21°C (70°F)	91 mm (3.6 inches)	78%	very high
November Weather	13°C (56°F)	69 mm (2.7 inches)	85%	high
December Weather	11°C (51°F)	117 mm (4.6 inches)	87%	moderate