December weather forecast
Seymour, CT

Weather in December

The first month of the winter, December, is still a cold month in Seymour, Connecticut, with an average temperature varying between 39.9°F (4.4°C) and 29.7°F (-1.3°C).

Temperature

In Seymour, the average high-temperature in December drops from a frosty 49.1°F (9.5°C) in November to a cold 39.9°F (4.4°C). The average low-temperature, in Seymour, is 29.7°F (-1.3°C).

Humidity

In December, the average relative humidity in Seymour is 77%.

Rainfall

In Seymour, in December, during 8.4 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. In Seymour, during the entire year, the rain falls for 118.8 days and collects up to 9.61" (244mm) of precipitation.

Snowfall

Months with snowfall in Seymour are January through March, November and December. December is the month with the most snowfall in Seymour, Connecticut. Snow falls for 3.3 days and accumulates 0.55" (14mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 14min of daylight.
On the first day of December in Seymour, sunrise is at 6:58 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

In Seymour, 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 estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Seymour?

The average high-temperature, in December, is 39.9°F (4.4°C), while the average low-temperature is 29.7°F (-1.3°C). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in July is estimated at 87.8°F (31°C).

What is the average humidity in December in Seymour?

In December, the average relative humidity in Seymour is 77%.

How many days does it rain in December in Seymour?

In December, in Seymour, Connecticut, the rain falls for 8.4 days. Throughout December, 1.1" (28mm) of precipitation is accumulated.

When does it snow the most in Seymour?

The month with the most snowfall in Seymour, Connecticut, is December, when snow falls for 3.3 days and typically aggregates up to 0.55" (14mm) of snow.

How much does it snow in Seymour in December?

In Seymour, Connecticut, in December, during 3.3 snowfall days, 0.55" (14mm) of snow is typically accumulated.

What is the month with the shortest days in Seymour?

The month with the shortest days in Seymour, Connecticut, is December, with an average of 9h and 14min of daylight.

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

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

When are sunrise and sunset in December in Seymour?

On the first day of December in Seymour, Connecticut, sunrise is at 6:58 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 many hours of sunshine does Seymour have in December?

The average sunshine duration in December is 4.8h.

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

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

How high is the UV index in December in Seymour?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe 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
Seymour, CT

Average temperature in December - Seymour, CT
  • Average high temperature in December: 39.9°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 29.7°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).

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Average pressure in December
Seymour, CT

Average pressure in December - Seymour, 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
Seymour, CT

Average wind speed in December - Seymour, CT
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in December
Seymour, CT

Average humidity in December - Seymour, CT
  • Average humidity in December: 77%

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in December
Seymour, CT

Average rainfall in December - Seymour, CT
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is July (1.22").
The driest months (with the least rainfall) are January and February (0.47").

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Average rainfall days in December
Seymour, CT

Average rainfall days in December - Seymour, CT
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is January (5.3 days).

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Average snowfall in December
Seymour, CT

Average snowfall in December - Seymour, CT
  • Average snowfall in December: 0.55"

The month with the highest snowfall is December (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Seymour, CT

Average snowfall days in December - Seymour, CT
  • Average snowfall days in December: 3.3 days

The month with the highest number of snowfall days is February (5.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Seymour, CT
  • Average daylight in December: 9h and 14min

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 14min).

  • Average sunshine in December: 4h and 48min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Seymour, CT

Average sunshine days in December - Seymour, CT
  • Average sunshine days in December: 18.7 days

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (13.9 days).

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Average UV index in December
Seymour, CT

Average UV index in December - Seymour, 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
Seymour, CT

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

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in December
Seymour, CT

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

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

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