December weather forecast
Watertown, CT

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Weather in December

December, the first month of the winter in Watertown, is also a wintry month, with an average temperature varying between 28°F (-2.2°C) and 38.7°F (3.7°C).

Temperature

With the onset of December, Watertown's average high-temperature adjusts, receding from November's chilly 48.6°F (9.2°C) to a cold 38.7°F (3.7°C). In the month of December, the temperature in Watertown generally rests at an average low of 28°F (-2.2°C).

Humidity

In December, the average relative humidity 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 Watertown, during December, snow falls for 6.2 days and regularly aggregates up to 2.87" (73mm) of snow. Throughout the year, there are 34.9 snowfall days, and 20.35" (517mm) of snow is accumulated.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in Watertown.
On the first day of December, sunrise is at 7:00 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:32 pm EST.

Sunshine

In December, the average sunshine 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 in Watertown. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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Frequently asked questions

How cold is it in Watertown in December?

December temperatures vary between a high-temperature of 38.7°F (3.7°C) and a low-temperature of 28°F (-2.2°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is calculated to be 84.2°F (29°C).

What is the average humidity in December in Watertown?

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

What is the rainiest month in Watertown?

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

How many days does it rain in December in Watertown?

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

How much does it snow in Watertown in December?

In Watertown, Connecticut, in December, during 6.2 snowfall days, 2.87" (73mm) of snow is typically accumulated.

What is the month with the shortest days in Watertown?

With an average of 9h and 12min of daylight, December has the shortest days of the year in Watertown.

What is the average length of the day in December in Watertown?

In December, the average day length is 9h and 13min.

When is the sunrise / sunset in December in Watertown?

In December, on the first day of the month, sunrise is at 7:00 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:32 pm EST.

How many hours of sunshine does Watertown have in December?

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

What are the months with the lowest UV index in Watertown?

The months with the lowest UV index in Watertown, 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 Watertown?

The average daily maximum UV index in December in Watertown, Connecticut, is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to Sun's UV rays.
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
Watertown, CT

Average temperature in December - Watertown, 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).

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Average pressure in December
Watertown, CT

Average pressure in December - Watertown, 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
Watertown, CT

Average wind speed in December - Watertown, 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).

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Average humidity in December
Watertown, CT

Average humidity in December - Watertown, 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%).

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Average rainfall in December
Watertown, CT

Average rainfall in December - Watertown, 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").

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Average rainfall days in December
Watertown, CT

Average rainfall days in December - Watertown, 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).

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Average snowfall in December
Watertown, CT

Average snowfall in December - Watertown, 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").

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Average snowfall days in December
Watertown, CT

Average snowfall days in December - Watertown, 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).

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

Average daylight in December / Average sunshine in December - Watertown, 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).

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Average sunshine days in December
Watertown, CT

Average sunshine days in December - Watertown, 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).

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Average UV index in December
Watertown, CT

Average UV index in December - Watertown, 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
Watertown, CT

Average cloud cover in December - Watertown, 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).

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Average visibility in December
Watertown, CT

Average visibility in December - Watertown, 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).

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Watertown, Connecticut, USA

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