December Weather in Norwalk, United States

Last updated: June 24, 2025

In December, the average temperature in Norwalk, United States hovers around 0°C (31°F), with a notable range from a chilly -23°C (-9°F) to a pleasantly warm 22°C (73°F). Expect 37 mm (1.5 in) of precipitation over roughly 5 days, contributing to an average humidity of 83%. Prepare for a brisk climate as you explore this unique destination!

December Temperature in Norwalk

In December in Norwalk, the average temperature is 0°C (31°F). Maximums can reach 22°C (73°F), while minimums can dip as low as -23°C (-9°F). Be prepared for a wide range of temperatures when traveling to Norwalk during this month.

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 0°C (31°F), with highs reaching up to 22°C (73°F) and lows dropping to around -23°C (-9°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 37 mm (1.5 in) spread over a period of 5 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 37 mm (1.5 inches) of precipitation spread over approximately 5 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 83%. With an average temperature of 0°C (31°F), this humidity feels like a biting chill that penetrates layers of clothing, making even short excursions feel daunting and uncomfortable.

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 83%, 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 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 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 3, 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	-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