December weather forecast and climate
Windham, CT

Weather in December

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

Temperature

In Windham, the average high-temperature in December drops, from a frosty 49.1°F (9.5°C) in November, to a cold 39.4°F (4.1°C). The average low-temperature, in December, is 28.6°F (-1.9°C).

Humidity

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

Rainfall

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

Snowfall

January through May, November and December are months with snowfall. In Windham, snow falls for 5.5 days, with typically accumulated 2.72" (69mm) of snow. Throughout the year, there are 31.6 snowfall days, and 15.98" (406mm) of snow is accumulated.

Daylight

With an average of 9.2h of daylight, December has the shortest days of the year in Windham.

Sunshine

The month with the least sunshine is December, with an average of 4.7h of sunshine.

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 estimate of 2, and below, represents a minimal health hazard from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 2 transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Windham?

The average high-temperature, in December, in Windham, Connecticut, is 39.4°F (4.1°C), while the average low-temperature is 28.6°F (-1.9°C).

What is the average humidity in December in Windham?

In December, the average relative humidity is 77%.

How much does it rain in Windham in December?

In December, in Windham, Connecticut, the rain falls for 11.5 days. Throughout December, 3.46" (88mm) of precipitation is accumulated.

What is the wettest month in Windham?

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

How much does it snow in Windham in December?

In Windham, Connecticut, in December, during 5.5 snowfall days, 2.72" (69mm) of snow is typically accumulated.

What is the month with the shortest days in Windham?

The month with the shortest days is December, with an average of 9.2h of daylight.

How many hours of daylight does Windham have in December?

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

What is the month with the least sunshine in Windham?

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

How long on average sun shines in December in Windham?

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

When is the lowest UV index in Windham?

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

What is the UV index intensity in December in Windham?

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

Average temperature in December
Windham, CT

Average temperature in December - 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).

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Average pressure in December
Windham, CT

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

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

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Average wind speed in December
Windham, CT

Average wind speed in December - 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).

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Average humidity in December
Windham, CT

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

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

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Average rainfall in December
Windham, CT

Average rainfall in December - 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").

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Average rainfall days in December
Windham, CT

Average rainfall days in December - 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).

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Average snowfall in December
Windham, CT

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

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

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Average snowfall days in December
Windham, CT

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

The month with the highest number of snowfall days is January (8.3 days).
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
Windham, CT

Average daylight in December / Average sunshine in December - Windham, 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

The month with the most sunshine is August (Average sunshine: 10.3h).
The month with the least sunshine is December (Average sunshine: 4.7h).

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Average sunshine days in December
Windham, CT

Average sunshine days in December - 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).

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Average UV index in December
Windham, CT

Average UV index in December - Windham, 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
Windham, CT

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

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).

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Average visibility in December
Windham, CT

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

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

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