December weather forecast and climate
Cromwell, CT

Weather in December

December, the first month of the winter, in Cromwell, is still a cold month, with average temperature ranging between min 29.1°F (-1.6°C) and max 39.7°F (4.3°C).

Temperature

In December, the average high-temperature 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

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

Months with snowfall are January through May, November and December. In December, in Cromwell, 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 9.2h of daylight.

Sunshine

The average sunshine in Cromwell 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 in Cromwell. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
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. 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 Cromwell?

The average high-temperature, in December, in Cromwell, is 39.7°F (4.3°C), while the average low-temperature is 29.1°F (-1.6°C).

What is the average humidity in December in Cromwell?

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

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.

What is the rainiest 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 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 in Cromwell is December, with an average of 9.2h of daylight.

How many hours of daylight does Cromwell have in December?

In December, the average length of the day is 9.2h.

How many hours of sunshine does Cromwell have in December?

In December, the average sunshine in Cromwell, Connecticut, is 4.7h.

When is the lowest UV index in Cromwell?

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?

The average daily maximum UV index in December in Cromwell is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.

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"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

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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").
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).
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: 9.2h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 4.7h

Months with the most sunshine are July and August (Average sunshine: 10.3h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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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

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).

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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

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

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