December weather forecast
Old Saybrook, CT

Weather in December

The first month of the winter, December, is also a wintry month in Old Saybrook, Connecticut, with an average temperature fluctuating between 32.4°F (0.2°C) and 41.9°F (5.5°C).

Temperature

In December, the average high-temperature slightly decreases from a fresh 50.7°F (10.4°C) in November to a cold 41.9°F (5.5°C). In Old Saybrook, in December, the average low-temperature is 32.4°F (0.2°C).

Humidity

The average relative humidity in December is 75%.

Rainfall

The month with the most rainfall in Old Saybrook, Connecticut, is December, when the rain falls for 13 days and typically aggregates up to 3.66" (93mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Old Saybrook. In Old Saybrook, in December, snow falls for 4.4 days, with typically accumulated 1.34" (34mm) of snow. In Old Saybrook, during the entire year, snow falls for 24.2 days and aggregates up to 9.53" (242mm) of snow.

Ocean temperature

In Old Saybrook, the average water temperature is 48.9°F (9.4°C).
Note: Swimming in 48.9°F (9.4°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 15min of daylight, December has the shortest days of the year in Old Saybrook.
On the first day of the month, sunrise is at 6:55 am and sunset at 4:21 pm. On the last day of December, sunrise is at 7:15 am and sunset at 4:30 pm EST.

Sunshine

February and December, with an average of 4.8h of sunshine, are months with the least sunshine in Old Saybrook, Connecticut.

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 value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Old Saybrook?

In Old Saybrook, in December, the average high-temperature is 41.9°F (5.5°C), and the average low-temperature is 32.4°F (0.2°C).

What is the average humidity in December in Old Saybrook?

The average relative humidity in December is 75%.

What is the wettest month in Old Saybrook?

December is the month with the most rainfall in Old Saybrook, Connecticut. Rain falls for 13 days and accumulates 3.66" (93mm) of precipitation.

How much does it rain in Old Saybrook in December?

In Old Saybrook, Connecticut, in December, during 13 rainfall days, 3.66" (93mm) of precipitation is typically accumulated.

How many days does it snow in December in Old Saybrook?

In Old Saybrook, Connecticut, in December, snow falls for 4.4 days, with typically accumulated 1.34" (34mm) of snow.

What is the water temperature in December in Old Saybrook?

In Old Saybrook, Connecticut, the average seawater temperature in December is 48.9°F (9.4°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Old Saybrook?

December has the shortest days of the year, with an average of 9h and 15min of daylight.

How many hours of daylight does Old Saybrook have in December?

The average day length in December in Old Saybrook is 9h and 15min.

When are sunrise and sunset in December in Old Saybrook?

In December, on the first day of the month, sunrise is at 6:55 am and sunset at 4:21 pm. On the last day of the month, in Old Saybrook, sunrise is at 7:15 am and sunset at 4:30 pm EST.

What is the month with the least sunshine in Old Saybrook?

February and December, with an average of 4.8h of sunshine, are months with the least sunshine in Old Saybrook, Connecticut.

How many hours of sunshine does Old Saybrook have in December?

In December, the average sunshine duration is 4.8h.

When is the lowest UV index in Old Saybrook?

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

What is the UV index reading in December in Old Saybrook?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes 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
Old Saybrook, CT

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

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 32.4°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).

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Average pressure in December
Old Saybrook, CT

Average pressure in December - Old Saybrook, CT
  • Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Old Saybrook, CT

Average wind speed in December - Old Saybrook, CT
  • Average wind speed in December: 10.6mph

The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

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Average humidity in December
Old Saybrook, CT

Average humidity in December - Old Saybrook, CT
  • Average humidity in December: 75%

The months with the highest relative humidity are May, June and July (78%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in December
Old Saybrook, CT

Average rainfall in December - Old Saybrook, CT
  • Average rainfall in December: 3.66"

The wettest month (with the highest rainfall) is December (3.66").
The driest month (with the least rainfall) is September (1.93").

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Average rainfall days in December
Old Saybrook, CT

Average rainfall days in December - Old Saybrook, CT
  • Average rainfall days in December: 13 days

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (9 days).

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Average snowfall in December
Old Saybrook, CT

Average snowfall in December - Old Saybrook, CT
  • Average snowfall in December: 1.34"

The month with the highest snowfall is March (2.76").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Old Saybrook, CT

Average snowfall days in December - Old Saybrook, CT
  • Average snowfall days in December: 4.4 days

The month with the highest number of snowfall days is February (7 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
Old Saybrook, CT

Average sea temperature in December - Old Saybrook, CT
  • Average sea temperature in December: 48.9°F

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

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Average daylight in December /
Average sunshine in December
Old Saybrook, CT

Average daylight in December / Average sunshine in December - Old Saybrook, CT
  • Average daylight in December: 9h and 15min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in December: 4h and 48min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in December
Old Saybrook, CT

Average sunshine days in December - Old Saybrook, CT
  • Average sunshine days in December: 14.8 days

The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is July (11.7 days).

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Average UV index in December
Old Saybrook, CT

Average UV index in December - Old Saybrook, 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
Old Saybrook, CT

Average cloud cover in December - Old Saybrook, CT
  • Average cloud cover in December: 48

The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in December
Old Saybrook, CT

Average visibility in December - Old Saybrook, 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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