December weather forecast
South Windham, CT

Share

Weather in December

The first month of the winter, December, is still a cold month in South Windham, Connecticut, with an average temperature varying between 39.4°F (4.1°C) and 28.6°F (-1.9°C).

Temperature

South Windham's progression into December involves a drop in the average high-temperature, receding from a chilly 49.1°F (9.5°C) in November to an icy 39.4°F (4.1°C). During December, South Windham observes a consistent average nighttime temperature of 28.6°F (-1.9°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

The month with the most rainfall is December, when the rain falls for 11.5 days and typically aggregates up to 3.46" (88mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In December, in South Windham, it is snowing for 5.5 days. Throughout December, 2.72" (69mm) of snow is accumulated. In South Windham, Connecticut, during the entire year, snow falls for 31.6 days and aggregates up to 15.98" (406mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in South Windham.
On the first day of the month, sunrise is at 6:56 am and sunset at 4:19 pm. On the last day of December, in South Windham, sunrise is at 7:15 am and sunset at 4:28 pm EST.

Sunshine

With an average of 4.7h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index in South Windham, Connecticut, are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 2 during December translates into the following directions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
[Resources]

Frequently asked questions

Is December cold in South Windham?

South Windham in December has an average high-temperature of 39.4°F (4.1°C) and an average low-temperature of 28.6°F (-1.9°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, in July is estimated at 87.8°F (31°C).

What is the average humidity in December in South Windham?

The average relative humidity in December is 77%.

What is the rainiest month in South Windham?

December is the month with the most rainfall in South Windham, Connecticut. Rain falls for 11.5 days and accumulates 3.46" (88mm) of precipitation.

How much does it rain in South Windham in December?

In South Windham, Connecticut, during December, the rain falls for 11.5 days and regularly aggregates up to 3.46" (88mm) of precipitation.

How much does it snow in South Windham in December?

In South Windham, Connecticut, during December, snow falls for 5.5 days and regularly aggregates up to 2.72" (69mm) of snow.

What is the month with the shortest days in South Windham?

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

What is the average length of the day in December in South Windham?

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

What time are sunrise and sunset in December in South Windham?

On the first day of December in South Windham, sunrise is at 6:56 am and sunset at 4:19 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:28 pm EST.

What is the month with the least sunshine in South Windham?

With an average of 4.7h of sunshine, December has the least sunshine of the year in South Windham.

How long on average sun shines in December in South Windham?

In South Windham, the average sunshine duration in December is 4.7h.

When is the lowest UV index in South Windham?

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

What is the UV index reading in December in South Windham?

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

Average temperature in December - South Windham, CT
  • Average high temperature in December: 39.4°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in December: 28.6°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

[Resources]

Average pressure in December
South Windham, CT

Average pressure in December - South Windham, CT
  • Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

[Resources]

Average wind speed in December
South Windham, CT

Average wind speed in December - South Windham, CT
  • Average wind speed in December: 8.4mph

The windiest months (with the highest average wind speed) are January and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

[Resources]

Average humidity in December
South Windham, CT

Average humidity in December - South Windham, CT
  • Average humidity in December: 77%

The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (72%).

[Resources]

Average rainfall in December
South Windham, CT

Average rainfall in December - South Windham, CT
  • Average rainfall in December: 3.46"

The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").

[Resources]

Average rainfall days in December
South Windham, CT

Average rainfall days in December - South Windham, CT
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.1 days).

[Resources]

Average snowfall in December
South Windham, CT

Average snowfall in December - South Windham, CT
  • Average snowfall in December: 2.72"

The month with the highest snowfall is March (4.41").
The months with the least snowfall are June, July, August, September and October (0").

[Resources]

Average snowfall days in December
South Windham, CT

Average snowfall days in December - South Windham, CT
  • Average snowfall days in December: 5.5 days

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

[Resources]

Average daylight in December /
Average sunshine in December
South Windham, CT

Average daylight in December / Average sunshine in December - South Windham, CT
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).

[Resources]

Average sunshine days in December
South Windham, CT

Average sunshine days in December - South Windham, CT
  • Average sunshine days in December: 15.2 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (10.8 days).

[Resources]

Average UV index in December
South Windham, CT

Average UV index in December - South Windham, 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
South Windham, CT

Average cloud cover in December - South Windham, CT
  • Average cloud cover in December: 48

The months with the most cloud cover are February, March, May and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 33).

[Resources]

Average visibility in December
South Windham, CT

Average visibility in December - South Windham, CT
  • Average visibility in December: 6mi

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

[Resources]

South Windham, Connecticut, USA

Weather forecast for your location

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