Southport
Connecticut, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Southport, CT

December, the first month of the winter, in Southport, is also a wintry month, with average temperature fluctuating between 33.3°F (0.7°C) and 41.9°F (5.5°C).

Temperature

In December, the average high-temperature decreases, from a cool 50.9°F (10.5°C) in November, to a cold 41.9°F (5.5°C). In Southport, the average low-temperature is 33.3°F (0.7°C).

Humidity

In December, the average relative humidity in Southport is 75%.

Rainfall

December is the month with the most rainfall in Southport. Rain falls for 12.7 days and accumulates 4.21" (107mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Southport, during December, snow falls for 4.3 days and regularly aggregates up to 1.81" (46mm) of snow. Throughout the year, in Southport, there are 24.9 snowfall days, and 9.41" (239mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature 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 9.3h of daylight, December has the shortest days of the year in Southport.

Sunshine

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

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Southport. A UV Index of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Southport?

The average high-temperature, in December, is 41.9°F (5.5°C), while the average low-temperature is 33.3°F (0.7°C).

What is the average humidity in December in Southport?

The average relative humidity in December in Southport is 75%.

How much does it rain in Southport in December?

In December, in Southport, Connecticut, the rain falls for 12.7 days. Throughout December, 4.21" (107mm) of precipitation is accumulated.

What is the wettest month in Southport?

The month with the most rainfall is December when the rain falls for 12.7 days and typically aggregates up to 4.21" (107mm) of precipitation.

How many days does it snow in December in Southport?

In Southport, Connecticut, during December, snow falls for 4.3 days and regularly aggregates up to 1.81" (46mm) of snow.

What is the ocean temperature in December in Southport?

In December, the average ocean temperature in Southport, Connecticut, is 48°F (8.9°C). Swimming in 48°F (8.9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Southport?

December has the shortest days of the year in Southport, with an average of 9.3h of daylight.

How many hours of daylight does Southport have in December?

The average length of the day in December in Southport, Connecticut, is 9.3h.

What is the month with the least sunshine in Southport?

Months with the least sunshine in Southport are February and December, with an average of 4.8h of sunshine.

How many hours of sunshine does Southport have in December?

In December, the average sunshine is 4.8h.

What is the month with the lowest UV index in Southport?

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

What is the UV index reading in December in Southport?

In Southport, Connecticut, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the UV radiation.
Average temperature in December - Southport, CT
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in December: 33.3°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).

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

Months with the highest relative humidity are May and June (76%).
Months with the lowest relative humidity are April and November (72%).

Average rainfall in December - Southport, CT
  • Average rainfall in December: 4.21"

The wettest month (with the highest rainfall) is December (4.21").
The driest month (with the least rainfall) is January (2.48").

Average rainfall days in December - Southport, CT
  • Average rainfall days in December: 12.7 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (9.4 days).

Average snowfall in December - Southport, CT
  • Average snowfall in December: 1.81"

The month with the highest snowfall is March (2.8").
Months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December - Southport, CT
  • Average snowfall days in December: 4.3 days

The month with the highest number of snowfall days is January (7.1 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average sea temperature in December - Southport, 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).

Average daylight in December / Average sunshine in December - Southport, CT
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 4.8h

The month with the most sunshine is July (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.8).

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

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