January Weather in Harlem, United States

Last updated: June 24, 2025

In Harlem, United States, the average temperature in January hovers around 9°C (49°F). Be prepared for fluctuations, as temperatures can dip to a brisk -7°C (20°F) or soar to a pleasant 26°C (79°F). During this month, expect 87 mm (3.4 in) of precipitation over approximately 9 days, contributing to a notably high average humidity of 86%.

January Temperature in Harlem

In January in Harlem, the average temperature is 9°C (49°F). Maximum temperatures can reach 26°C (79°F), while minimums can drop as low as -7°C (20°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 9°C (49°F), with highs reaching up to 26°C (79°F) and lows dropping to around -7°C (20°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 87 mm (3.4 in), occurring over a span of 9 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 87 mm (3.4 inches) of precipitation spread over approximately 9 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 Harlem

In Harlem in January, humidity is 86%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill in the air, making travel uncomfortable as the moisture clings to your skin and thickens the atmosphere, creating a sense of heaviness that can tire you quickly.

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 86%, 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 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 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 4, which falls under the moderate 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	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