December Weather in Norwalk, United States

Last updated: June 24, 2025

In December, the average temperature in Norwalk, United States hovers around 13°C (56°F). Expect a minimum of 3°C (37°F) and a pleasant maximum of 27°C (82°F). Throughout the month, precipitation averages 72 mm (2.8 in) spread over 4 days, while the average humidity lingers at a comfortable 71%.

December Temperature in Norwalk

In December in Norwalk, the average temperature is 13°C (56°F), with maximums reaching up to 27°C (82°F) and minimums dropping as low as 3°C (37°F). This makes it an ideal time for travelers to enjoy mild weather while exploring all that Norwalk has to offer.

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

The chart illustrates December 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, December typically has an average temperature of 13°C (56°F), with highs reaching up to 27°C (82°F) and lows dropping to around 3°C (37°F).

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

December Precipitation in Norwalk

In Norwalk in December, the precipitation amount is 72 mm (2.8 in) over the course of 4 days.

December Precipitation Trends in Norwalk

The chart displays monthly precipitation patterns in Norwalk, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Norwalk, December typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 4 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Norwalk

In Norwalk in December humidity is 71%. With an average temperature of 13°C (56°F), this humidity feels like a damp embrace that can make exploring the area feel a bit stifling and requires light, breathable clothing to remain comfortable while traveling.

December Average Humidity in Norwalk

This chart illustrates the average monthly humidity levels in Norwalk, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Norwalk is approximately 71%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Norwalk

In Norwalk in December, 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 Norwalk for better planning.

Maximum UV Index Levels in Norwalk for December

The chart shows the monthly maximum UV Index (UVI) for Norwalk in December, 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 December, the maximum UV index in Norwalk typically reaches 4, which falls under the moderate exposure category.

Data source: Norwalk December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	75 mm (3.0 inches)	74%	moderate
February Weather	13°C (56°F)	63 mm (2.5 inches)	79%	high
March Weather	14°C (58°F)	67 mm (2.7 inches)	75%	very high
April Weather	17°C (63°F)	23 mm (0.9 inches)	70%	very high
May Weather	18°C (65°F)	16 mm (0.6 inches)	70%	very high
June Weather	21°C (70°F)	3 mm (0.1 inches)	72%	extreme
July Weather	24°C (76°F)	2 mm (0.1 inches)	73%	extreme
August Weather	25°C (76°F)	2 mm (0.1 inches)	69%	very high
September Weather	23°C (74°F)	4 mm (0.1 inches)	68%	very high
October Weather	20°C (69°F)	10 mm (0.4 inches)	67%	high
November Weather	17°C (62°F)	20 mm (0.8 inches)	68%	moderate
December Weather	13°C (56°F)	72 mm (2.8 inches)	71%	moderate