December weather forecast
Cromwell, CT

Weather in December

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

Temperature

In Cromwell, the average high-temperature in December drops from a frosty 49.3°F (9.6°C) in November to a cold 39.7°F (4.3°C). In December, in Cromwell, the average low-temperature is 29.1°F (-1.6°C).

Humidity

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

Rainfall

December is the month with the most rainfall in Cromwell. Rain falls for 11.9 days and accumulates 3.66" (93mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Cromwell. In December, it is snowing for 5.3 days. Throughout December, 2.28" (58mm) of snow is accumulated. Throughout the year, there are 29.4 snowfall days, and 14.76" (375mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Cromwell, with an average of 9h and 13min of daylight.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:21 pm. On the last day of December, in Cromwell, sunrise is at 7:17 am and sunset at 4:29 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 of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Cromwell?

The average high-temperature, in December, in Cromwell, Connecticut, is 39.7°F (4.3°C), while the average low-temperature is 29.1°F (-1.6°C). in August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, is calculated to be 86°F (30°C).

What is the average humidity in December in Cromwell?

The average relative humidity in December in Cromwell is 77%.

What is the wettest month in Cromwell?

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

How much does it rain in Cromwell in December?

In Cromwell, Connecticut, during December, the rain falls for 11.9 days and regularly aggregates up to 3.66" (93mm) of precipitation.

How many days does it snow in December in Cromwell?

In Cromwell, in December, during 5.3 snowfall days, 2.28" (58mm) of snow is typically accumulated.

What is the month with the shortest days in Cromwell?

The month with the shortest days is December, with an average of 9h and 13min of daylight.

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

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

When is the sunrise / sunset in December in Cromwell?

On the first day of December in Cromwell, Connecticut, sunrise is at 6:57 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:29 pm EST.

How long on average sun shines in December in Cromwell?

In December, the average sunshine duration is 4.7h.

When is the lowest UV index in Cromwell?

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

What is the UV index intensity in December in Cromwell?

In December, the average daily maximum UV index 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
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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 13min

The month with the longest days is June (Average daylight: 15h and 8min).
The month with the shortest days is December (Average daylight: 9h and 13min).

  • Average sunshine in December: 4h and 42min

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).

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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).

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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).

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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).

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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).

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