December weather forecast
Cromwell, CT

Share

Weather in December

December, the first month of the winter in Cromwell, is also an icy month, with an average temperature fluctuating between 39.7°F (4.3°C) and 29.1°F (-1.6°C).

Temperature

As Cromwell enters December, the average high-temperature decreases from the a frosty 49.3°F (9.6°C) of November to a wintry 39.7°F (4.3°C). Throughout December, the temperature tends to fall to a consistent average low of 29.1°F (-1.6°C).

Humidity

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

Rainfall

The month with the most rainfall is December, when the rain falls for 11.9 days and typically aggregates up to 3.66" (93mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Cromwell, Connecticut. In Cromwell, Connecticut, in December, snow falls for 5.3 days, with typically accumulated 2.28" (58mm) of snow. In Cromwell, Connecticut, during the entire year, snow falls for 29.4 days and aggregates up to 14.76" (375mm) of snow.

Daylight

December has the shortest days of the year in Cromwell, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:30 pm EST.

Sunshine

In Cromwell, 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 reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The daily high UV index of 2 during December translates into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Stay sun-safe with clothing that is both closely woven and worn loosely. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
[Resources]

Frequently asked questions

How cold is December in Cromwell?

December temperatures in Cromwell vary between a high-temperature of 39.7°F (4.3°C) and a low-temperature of 29.1°F (-1.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 86°F (30°C).

What is the average humidity in December in Cromwell?

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

What is the wettest month in Cromwell?

The month with the most rainfall in Cromwell is December, when the rain falls for 11.9 days and typically aggregates up to 3.66" (93mm) of precipitation.

How many days does it rain in December in Cromwell?

In Cromwell, Connecticut, in December, it is raining for 11.9 days, with typically 3.66" (93mm) of accumulated precipitation.

How many days does it snow in December in Cromwell?

In Cromwell, Connecticut, during December, snow falls for 5.3 days and regularly aggregates up to 2.28" (58mm) of snow.

What is the month with the shortest days in Cromwell?

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

How many hours of daylight does Cromwell have in December?

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

What time are sunrise and sunset in December in Cromwell?

On the first day of December in Cromwell, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:30 pm EST.

How long on average sun shines in December in Cromwell?

The average sunshine duration in December in Cromwell, Connecticut, is 4.7h.

When is the lowest UV index in Cromwell?

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

In Cromwell, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat from unprotected exposure to 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
Cromwell, CT

Average temperature in December - Cromwell, CT
  • Average high temperature in December: 39.7°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in December: 29.1°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).

[Resources]

Average pressure in December
Cromwell, CT

Average pressure in December - Cromwell, CT
  • Average pressure in December: 30.05"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).

[Resources]

Average wind speed in December
Cromwell, CT

Average wind speed in December - Cromwell, CT
  • Average wind speed in December: 8mph

The windiest months (with the highest average wind speed) are January and March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

[Resources]

Average humidity in December
Cromwell, CT

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

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (71%).

[Resources]

Average rainfall in December
Cromwell, CT

Average rainfall in December - Cromwell, 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 (1.89").

[Resources]

Average rainfall days in December
Cromwell, CT

Average rainfall days in December - Cromwell, CT
  • Average rainfall days in December: 11.9 days

The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is January (9.1 days).

[Resources]

Average snowfall in December
Cromwell, CT

Average snowfall in December - Cromwell, CT
  • Average snowfall in December: 2.28"

The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August, September and October (0").

[Resources]

Average snowfall days in December
Cromwell, CT

Average snowfall days in December - Cromwell, CT
  • Average snowfall days in December: 5.3 days

The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Cromwell, 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 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

[Resources]

Average sunshine days in December
Cromwell, CT

Average sunshine days in December - Cromwell, CT
  • Average sunshine days in December: 15.1 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (11.3 days).

[Resources]

Average UV index in December
Cromwell, CT

Average UV index in December - Cromwell, 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).

[Resources]

Average cloud cover in December
Cromwell, CT

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

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 33).

[Resources]

Average visibility in December
Cromwell, CT

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

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

[Resources]

Cromwell, Connecticut, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location