January Weather in Harlem, United States

Last updated: June 24, 2025

In January, the average temperature in Harlem, United States settles at a chilly -6°C (21°F). Minimum temperatures can plunge to -33°C (-28°F), while highs can reach a mild 13°C (55°F). Expect a moderate precipitation amount of 11 mm (0.4 in) spread over approximately 3 days, with an average humidity level of 85%, contributing to the crisp winter atmosphere.

January Temperature in Harlem

In January in Harlem, the average temperature is -6°C (21°F). The maximum can reach 13°C (55°F), while the minimum can drop as low as -33°C (-28°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates January 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, January typically has an average temperature of -6°C (21°F), with highs reaching up to 13°C (55°F) and lows dropping to around -33°C (-28°F).

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

January Precipitation in Harlem

In Harlem in January, the precipitation amount is 11 mm (0.4 in) over the course of 3 days.

January Precipitation Trends in Harlem

The chart displays monthly precipitation patterns in Harlem, 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 Harlem, January typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 3 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Harlem

In Harlem in January, humidity is 85%. With an average temperature of -6°C (21°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and forcing you to bundle up even more than usual as you navigate through frosty air.

January Average Humidity in Harlem

This chart illustrates the average monthly humidity levels in Harlem, 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 Harlem is approximately 85%, 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 Harlem

In Harlem in January, 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 January

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

Data source: Harlem 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 Harlem Compares to Other Months

Weather in Harlem varies notably across the year, with each month offering distinct climate conditions. This page compares January’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 January’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