December weather forecast
Wilton, CT

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Weather in December

December, the first month of the winter in Wilton, is still a cold month, with an average temperature varying between 31.8°F (-0.1°C) and 40.8°F (4.9°C).

Temperature

Wilton's progression into December includes a drop in the average high-temperature, from a fresh 50°F (10°C) in November to a wintry 40.8°F (4.9°C). December introduces a small decrease to a nighttime average of 31.8°F (-0.1°C) in Wilton, Connecticut.

Humidity

The months with the highest humidity are February, May, June, October and December, with an average relative humidity of 76%.

Rainfall

The month with the most rainfall is December, when the rain falls for 12.3 days and typically aggregates up to 4.17" (106mm) of precipitation.

Snowfall

Months with snowfall in Wilton are January through April, November and December. In Wilton, in December, snow falls for 5.1 days, with typically accumulated 2.6" (66mm) of snow. In Wilton, during the entire year, snow falls for 28.5 days and aggregates up to 11.65" (296mm) of snow.

Daylight

The month with the shortest days in Wilton is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:35 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

The months with the lowest UV index in Wilton, Connecticut, 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 ordinary individuals.
Note: A daily maximum UV index of 2 in December translates into the following instructions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
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Frequently asked questions

How cold does it get in Wilton in December?

The average high-temperature, in December, in Wilton, is 40.8°F (4.9°C), while the average low-temperature is 31.8°F (-0.1°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in July is evaluated at 86°F (30°C).

What are the most humid months in Wilton?

The months with the highest humidity in Wilton are February, May, June, October and December, with an average relative humidity of 76%.

What is the average humidity in December in Wilton?

In Wilton, the average relative humidity in December is 76%.

What is the rainiest month in Wilton?

December is the month with the most rainfall. Rain falls for 12.3 days and accumulates 4.17" (106mm) of precipitation.

How many days does it rain in December in Wilton?

In Wilton, in December, during 12.3 rainfall days, 4.17" (106mm) of precipitation is typically accumulated.

How many days does it snow in December in Wilton?

In Wilton, Connecticut, in December, during 5.1 snowfall days, 2.6" (66mm) of snow is typically accumulated.

What is the month with the shortest days in Wilton?

With an average of 9h and 18min of daylight, December has the shortest days of the year in Wilton.

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

In December, the average day length in Wilton is 9h and 16min.

When are sunrise and sunset in December in Wilton?

On the first day of December in Wilton, sunrise is at 7:00 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:35 pm EST.

How long on average sun shines in December in Wilton?

The average sunshine duration in December is 4.8h.

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

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

How high is the UV index in December in Wilton?

The average daily maximum UV index in December in Wilton is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Wilton, CT

Average temperature in December - Wilton, CT
  • Average high temperature in December: 40.8°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in December: 31.8°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25°F).

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Average pressure in December
Wilton, CT

Average pressure in December - Wilton, 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
Wilton, CT

Average wind speed in December - Wilton, CT
  • Average wind speed in December: 9.2mph

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).

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Average humidity in December
Wilton, CT

Average humidity in December - Wilton, CT
  • Average humidity in December: 76%

The months with the highest relative humidity are February, May, June, October and December (76%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in December
Wilton, CT

Average rainfall in December - Wilton, CT
  • Average rainfall in December: 4.17"

The wettest month (with the highest rainfall) is December (4.17").
The driest month (with the least rainfall) is January (2.44").

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Average rainfall days in December
Wilton, CT

Average rainfall days in December - Wilton, CT
  • Average rainfall days in December: 12.3 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (8.6 days).

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Average snowfall in December
Wilton, CT

Average snowfall in December - Wilton, CT
  • Average snowfall in December: 2.6"

The month with the highest snowfall is February (3.46").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Wilton, CT

Average snowfall days in December - Wilton, CT
  • Average snowfall days in December: 5.1 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, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Wilton, CT
  • Average daylight in December: 9h and 2min

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 18min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Wilton, CT

Average sunshine days in December - Wilton, CT
  • Average sunshine days in December: 14.5 days

The month with the most sunshine days is January (17.3 days).
The month with the least sunshine days is June (10.1 days).

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Average UV index in December
Wilton, CT

Average UV index in December - Wilton, 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
Wilton, CT

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

The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in December
Wilton, CT

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

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

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Wilton, Connecticut, USA

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