December weather forecast
New Salem, IL

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Weather in December

December, the first month of the winter in New Salem, is also a wintry month, with an average temperature fluctuating between 27.9°F (-2.3°C) and 39°F (3.9°C).

Temperature

December is characterized by a reduction in the average high-temperature, from a cool 50.9°F (10.5°C) in November to an icy 39°F (3.9°C). The month of December records an average low-temperature of 27.9°F (-2.3°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In New Salem, in December, it is raining for 7 days, with typically 0.87" (22mm) of accumulated precipitation. Throughout the year, there are 128.8 rainfall days, and 18.35" (466mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In New Salem, in December, during 4.2 snowfall days, 0.79" (20mm) of snow is typically accumulated. In New Salem, Illinois, during the entire year, snow falls for 21.9 days and aggregates up to 5.67" (144mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:49 pm CST.

Sunshine

The average sunshine in December is 4.8h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Updated: Jul 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

In December, the average high-temperature and low-temperature are 39°F (3.9°C) and 27.9°F (-2.3°C) respectively. The average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, in August is calculated to be 91.4°F (33°C).

What is the average humidity in December?

In December, the average relative humidity is 77%.

How many days does it rain in December?

In New Salem, during December, the rain falls for 7 days and regularly aggregates up to 0.87" (22mm) of precipitation.

How much does it snow in December?

In New Salem, in December, during 4.2 snowfall days, 0.79" (20mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In New Salem, Illinois, the average day length in December is 9h and 25min.

When is the sunrise / sunset in December?

On the first day of December in New Salem, sunrise is at 7:05 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:49 pm CST.

How long on average sun shines in December?

In New Salem, the average sunshine duration in December is 4.8h.

When is the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December?

In New Salem, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
New Salem, IL

Average temperature in December - New Salem, IL
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
New Salem, IL

Average pressure in December - New Salem, IL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
New Salem, IL

Average wind speed in December - New Salem, IL
  • Average wind speed in December: 9.4mph

The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in December
New Salem, IL

Average humidity in December - New Salem, IL
  • Average humidity in December: 77%

The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
New Salem, IL

Average rainfall in December - New Salem, IL
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.75").

Average rainfall days in December
New Salem, IL

Average rainfall days in December - New Salem, IL
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
New Salem, IL

Average snowfall in December - New Salem, IL
  • Average snowfall in December: 0.79"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
New Salem, IL

Average snowfall days in December - New Salem, IL
  • Average snowfall days in December: 4.2 days

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
New Salem, IL

Average daylight in December / Average sunshine in December - New Salem, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in December
New Salem, IL

Average sunshine days in December - New Salem, IL
  • Average sunshine days in December: 20.7 days

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is June (12.3 days).

Average UV index in December
New Salem, IL

Average UV index in December - New Salem, IL
  • 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, November and December (UV index 2).

Average cloud cover in December
New Salem, IL

Average cloud cover in December - New Salem, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in December
New Salem, IL

Average visibility in December - New Salem, IL
  • 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).

New Salem, Illinois, USA

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