December weather forecast
Norwalk, CT

The tourist attraction spot of a stone house home to the Sheffield Island lighthouse in Norwalk, Connecticut
The tourist attraction spot of a stone house home to the Sheffield Island lighthouse in Norwalk, Connecticut

Weather in December

December, the first month of the winter in Norwalk, is still a cold month, with an average temperature ranging between max 41.9°F (5.5°C) and min 32.9°F (0.5°C).

Temperature

In December, the average high-temperature drops from a cool 50.9°F (10.5°C) in November to a wintry 41.9°F (5.5°C). In December, the average low-temperature is 32.9°F (0.5°C).

Humidity

The average relative humidity in December is 75%.

Rainfall

In December, the rain falls for 12.2 days. Throughout December, 3.98" (101mm) of precipitation is accumulated. In Norwalk, during the entire year, the rain falls for 166.3 days and collects up to 37.87" (962mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Norwalk. In December, it is snowing for 3.6 days. Throughout December, 1.77" (45mm) of snow is accumulated. In Norwalk, during the entire year, snow falls for 24.6 days and aggregates up to 9.61" (244mm) of snow.

Ocean temperature

In Norwalk, the average seawater temperature in December is 48°F (8.9°C).
Note: Swimming in 48°F (8.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

With an average of 9h and 16min of daylight, December has the shortest days of the year in Norwalk.
On the first day of December, sunrise is at 6:59 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:34 pm EST.

Sunshine

In Norwalk, Connecticut, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Norwalk?

In December, in Norwalk, the average high-temperature is 41.9°F (5.5°C), and the average low-temperature is 32.9°F (0.5°C). in July, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is estimated at 86°F (30°C).

What is the average humidity in December in Norwalk?

The average relative humidity in December in Norwalk, Connecticut, is 75%.

How much does it rain in Norwalk in December?

In Norwalk, in December, during 12.2 rainfall days, 3.98" (101mm) of precipitation is typically accumulated.

How many days does it snow in December in Norwalk?

In Norwalk, in December, snow falls for 3.6 days, with typically accumulated 1.77" (45mm) of snow.

What is the water temperature in December in Norwalk?

In December, the average ocean temperature in Norwalk is 48°F (8.9°C). Swimming in 48°F (8.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Norwalk?

December has the shortest days of the year, with an average of 9h and 16min of daylight.

How many hours of daylight does Norwalk have in December?

The average day length in December in Norwalk, Connecticut, is 9h and 16min.

What time are sunrise and sunset in December in Norwalk?

In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:25 pm. On the last day of the month, in Norwalk, Connecticut, sunrise is at 7:18 am and sunset at 4:34 pm EST.

How long on average sun shines in December in Norwalk?

The average sunshine duration in December is 4.8h.

When is the lowest UV index in Norwalk?

The months with the lowest UV index in Norwalk, Connecticut, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Norwalk?

The average daily maximum UV index in December in Norwalk, Connecticut, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Norwalk, CT

Average temperature in December - Norwalk, CT
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

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Average pressure in December
Norwalk, CT

Average pressure in December - Norwalk, CT
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Norwalk, CT

Average wind speed in December - Norwalk, CT
  • Average wind speed in December: 9.8mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in December
Norwalk, CT

Average humidity in December - Norwalk, CT
  • Average humidity in December: 75%

The months with the highest relative humidity are February, May and June (76%).
The months with the lowest relative humidity are April and November (72%).

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Average rainfall in December
Norwalk, CT

Average rainfall in December - Norwalk, CT
  • Average rainfall in December: 3.98"

The wettest month (with the highest rainfall) is July (4.13").
The driest months (with the least rainfall) are January and February (2.36").

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Average rainfall days in December
Norwalk, CT

Average rainfall days in December - Norwalk, CT
  • Average rainfall days in December: 12.2 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in December
Norwalk, CT

Average snowfall in December - Norwalk, CT
  • Average snowfall in December: 1.77"

The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Norwalk, CT

Average snowfall days in December - Norwalk, CT
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is February (7.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Norwalk, CT

Average sea temperature in December - Norwalk, CT
  • Average sea temperature in December: 48.1°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (39°F).

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Average daylight in December /
Average sunshine in December
Norwalk, CT

Average daylight in December / Average sunshine in December - Norwalk, CT
  • Average daylight in December: 9h and 16min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 16min).

  • Average sunshine in December: 4h and 48min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Norwalk, CT

Average sunshine days in December - Norwalk, CT
  • Average sunshine days in December: 15.4 days

The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is June (10 days).

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Average UV index in December
Norwalk, CT

Average UV index in December - Norwalk, CT
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Norwalk, CT

Average cloud cover in December - Norwalk, CT
  • Average cloud cover in December: 48

The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in December
Norwalk, CT

Average visibility in December - Norwalk, CT
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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