December weather forecast
Waterbury, CT

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Weather in December

December welcomes winters with temperatures dropping between 28°F (-2.2°C) and 38.7°F (3.7°C). The city dresses up for the festive season against a backdrop of snow flurries. With fairytale-like scenes of snow-dusted trees and rooftops, the holiday spirit of the residents finds a match in the wintry surroundings. Waterbury sees a fascinating transformation in this month of festive cheer and winter chills.

Temperature

The shift from November to December involves a decrease in the average high-temperature, from a frosty 48.6°F (9.2°C) to a wintry 38.7°F (3.7°C). An average low-temperature of 28°F (-2.2°C) is anticipated throughout the nights during December.

Humidity

In Waterbury, the average relative humidity in December is 78%.

Rainfall

The month with the most rainfall is December, when the rain falls for 10.5 days and typically aggregates up to 3.78" (96mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Waterbury, in December, snow falls for 6.2 days, with typically accumulated 2.87" (73mm) of snow. In Waterbury, Connecticut, during the entire year, snow falls for 34.9 days and aggregates up to 20.35" (517mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 6:59 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:32 pm EST.

Sunshine

The average sunshine in December is 4.7h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 2 during December translates into the following directions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.

Frequently asked questions

How cold is December?

An average high-temperature, in December, in Waterbury, is 38.7°F (3.7°C) and the average low-temperature is 28°F (-2.2°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, is estimated at 84.2°F (29°C).

What is the average humidity in December?

The average relative humidity in December is 78%.

What is the wettest month?

December is the month with the most rainfall. Rain falls for 10.5 days and accumulates 3.78" (96mm) of precipitation.

How many days does it rain in December?

In Waterbury, in December, it is raining for 10.5 days, with typically 3.78" (96mm) of accumulated precipitation.

How many days does it snow in December?

In December, it is snowing for 6.2 days. Throughout December, 2.87" (73mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 14min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:32 pm EST.

How long on average sun shines in December?

In Waterbury, the average sunshine duration in December is 4.7h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
Waterbury, CT

Average temperature in December - Waterbury, CT
  • Average high temperature in December: 38.7°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.3°F).

  • Average low temperature in December: 28°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).

Average pressure in December
Waterbury, CT

Average pressure in December - Waterbury, 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).

Average wind speed in December
Waterbury, CT

Average wind speed in December - Waterbury, CT
  • Average wind speed in December: 7.9mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

Average humidity in December
Waterbury, CT

Average humidity in December - Waterbury, CT
  • Average humidity in December: 78%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (72%).

Average rainfall in December
Waterbury, CT

Average rainfall in December - Waterbury, CT
  • Average rainfall in December: 3.78"

The wettest month (with the highest rainfall) is December (3.78").
The driest month (with the least rainfall) is September (2.13").

Average rainfall days in December
Waterbury, CT

Average rainfall days in December - Waterbury, CT
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in December
Waterbury, CT

Average snowfall in December - Waterbury, CT
  • Average snowfall in December: 2.87"

The month with the highest snowfall is February (5.39").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Waterbury, CT

Average snowfall days in December - Waterbury, CT
  • Average snowfall days in December: 6.2 days

The month with the highest number of snowfall days is February (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Waterbury, CT
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 4h and 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Waterbury, CT

Average sunshine days in December - Waterbury, CT
  • Average sunshine days in December: 15.5 days

The month with the most sunshine days is January (18.1 days).
The month with the least sunshine days is June (11.1 days).

Average UV index in December
Waterbury, CT

Average UV index in December - Waterbury, 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).

Average cloud cover in December
Waterbury, CT

Average cloud cover in December - Waterbury, CT
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in December
Waterbury, CT

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

The months with the highest visibility are January, March, April, October, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August and September (5mi).

Waterbury, Connecticut, USA

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