January Weather in Hartford, United States

Last updated: June 24, 2025

In January, the average temperature in Hartford, United States hovers around 3°C (37°F). Be prepared for a temperature range that can dip as low as -19°C (-1°F) and soar to a pleasant 21°C (70°F). Expect 93 mm (3.7 in) of precipitation over 9 days, creating an atmosphere of high humidity at 87%.

January Temperature in Hartford

In January in Hartford, the average temperature is 3°C (37°F). Maximum temperatures can reach up to 21°C (70°F), while the minimum can drop as low as -19°C (-1°F). Be prepared for a wide range of temperatures when traveling to Hartford during this month.

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

The chart illustrates January temperature patterns in Hartford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartford, January typically has an average temperature of 3°C (37°F), with highs reaching up to 21°C (70°F) and lows dropping to around -19°C (-1°F).

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

January Precipitation in Hartford

In Hartford in January, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.

January Precipitation Trends in Hartford

The chart displays monthly precipitation patterns in Hartford, 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 Hartford, January typically receives around 93 mm (3.7 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 Hartford

In Hartford in January, humidity is 87%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating proper layers to stay warm while navigating the wet conditions.

January Average Humidity in Hartford

This chart illustrates the average monthly humidity levels in Hartford, 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 Hartford is approximately 87%, 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 Hartford

In Hartford in January, 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 Hartford, you can check the information here.

Maximum UV Index Levels in Hartford for January

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

Data source: Hartford 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 Hartford Compares to Other Months

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

This table compares monthly weather conditions in Hartford, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (37°F)	93 mm (3.7 inches)	87%	moderate
February Weather	5°C (42°F)	150 mm (5.9 inches)	86%	high
March Weather	10°C (50°F)	129 mm (5.1 inches)	86%	high
April Weather	14°C (58°F)	149 mm (5.9 inches)	82%	very high
May Weather	21°C (70°F)	126 mm (5.0 inches)	82%	very high
June Weather	25°C (77°F)	125 mm (4.9 inches)	83%	extreme
July Weather	27°C (80°F)	103 mm (4.1 inches)	80%	very high
August Weather	25°C (78°F)	92 mm (3.6 inches)	74%	very high
September Weather	23°C (73°F)	103 mm (4.1 inches)	71%	very high
October Weather	17°C (62°F)	115 mm (4.5 inches)	78%	high
November Weather	8°C (47°F)	93 mm (3.7 inches)	88%	moderate
December Weather	6°C (43°F)	106 mm (4.2 inches)	88%	moderate