January Weather in Norwalk, United States

Last updated: June 24, 2025

In January, the average temperature in Norwalk, United States hovers around -5°C (23°F). Expect temperatures to dip as low as -31°C (-24°F), while the mercury can rise to a maximum of 14°C (58°F). During this chilly month, precipitation amounts to 38 mm (1.5 in) over approximately 6 days, contributing to a fairly damp atmosphere with an average humidity of 78%.

January Temperature in Norwalk

In January in Norwalk, the average temperature is -5°C (23°F), with a maximum that can reach 14°C (58°F) and a minimum that can drop as low as -31°C (-24°F). Travelers should be prepared for a significant temperature range, with the potential for very cold days, so packing appropriate winter gear is essential.

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

The chart illustrates January temperature patterns in Norwalk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Norwalk, January typically has an average temperature of -5°C (23°F), with highs reaching up to 14°C (58°F) and lows dropping to around -31°C (-24°F).

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

January Precipitation in Norwalk

In Norwalk in January, the total precipitation amount is 38 mm (1.5 in) spread over 6 days.

January Precipitation Trends in Norwalk

The chart displays monthly precipitation patterns in Norwalk, 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 Norwalk, January typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 6 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 Norwalk

In Norwalk in January, humidity is 78%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that penetrates your clothes, making outdoor activities uncomfortable and necessitating extra layers to stay warm while exploring the area.

January Average Humidity in Norwalk

This chart illustrates the average monthly humidity levels in Norwalk, 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 Norwalk is approximately 78%, 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 Norwalk

In Norwalk 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 Norwalk, you can check the information here.

Maximum UV Index Levels in Norwalk for January

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

Data source: Norwalk 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 Norwalk Compares to Other Months

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

This table compares monthly weather conditions in Norwalk, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	38 mm (1.5 inches)	78%	moderate
February Weather	-4°C (24°F)	40 mm (1.6 inches)	80%	moderate
March Weather	4°C (40°F)	83 mm (3.3 inches)	77%	high
April Weather	10°C (50°F)	72 mm (2.9 inches)	77%	very high
May Weather	17°C (63°F)	171 mm (6.7 inches)	77%	very high
June Weather	24°C (75°F)	122 mm (4.8 inches)	81%	extreme
July Weather	25°C (78°F)	67 mm (2.6 inches)	81%	very high
August Weather	24°C (75°F)	82 mm (3.2 inches)	77%	very high
September Weather	20°C (69°F)	112 mm (4.4 inches)	73%	very high
October Weather	11°C (53°F)	126 mm (4.9 inches)	75%	high
November Weather	4°C (39°F)	39 mm (1.5 inches)	85%	moderate
December Weather	0°C (31°F)	37 mm (1.5 inches)	83%	moderate