January Weather in Norwalk, United States

Last updated: June 24, 2025

In January, the average temperature in Norwalk, United States hovers around -7°C (20°F). Extreme lows can plummet to -33°C (-27°F), while highs may reach up to 9°C (49°F). During this month, you can expect a precipitation amount of 40 mm (1.6 in) spread over 7 days, with an average humidity of 84%.

January Temperature in Norwalk

In January, in Norwalk, the average temperature is -7°C (20°F). Maximums can reach 9°C (49°F), while minimums can dip as low as -33°C (-27°F). Travelers should be prepared for chilly weather, bringing appropriate clothing to ensure comfort during their visit.

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 -7°C (20°F), with highs reaching up to 9°C (49°F) and lows dropping to around -33°C (-27°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 precipitation amount is 40 mm (1.6 in) over a span of 7 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 40 mm (1.6 inches) of precipitation spread over approximately 7 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 84%. With an average temperature of -7°C (20°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

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 84%, 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 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 Norwalk, you can visit Hourly UV Index in Norwalk.

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 2, which falls under the low 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	-7°C (20°F)	40 mm (1.6 inches)	84%	low
February Weather	-6°C (21°F)	54 mm (2.1 inches)	85%	moderate
March Weather	2°C (35°F)	59 mm (2.3 inches)	84%	moderate
April Weather	7°C (45°F)	91 mm (3.6 inches)	83%	very high
May Weather	15°C (59°F)	141 mm (5.5 inches)	75%	very high
June Weather	21°C (70°F)	121 mm (4.8 inches)	79%	very high
July Weather	23°C (74°F)	110 mm (4.3 inches)	75%	very high
August Weather	21°C (70°F)	117 mm (4.6 inches)	69%	very high
September Weather	18°C (64°F)	112 mm (4.4 inches)	74%	very high
October Weather	10°C (50°F)	115 mm (4.5 inches)	79%	moderate
November Weather	2°C (35°F)	52 mm (2.0 inches)	88%	moderate
December Weather	-3°C (27°F)	46 mm (1.8 inches)	82%	low