December weather forecast
Atwater, IL

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Weather in December

The first month of the winter, December, is also a wintry month in Atwater, Illinois, with an average temperature ranging between min 28.6°F (-1.9°C) and max 39.7°F (4.3°C).

Temperature

Start of December brings a shift in the average high-temperature, falling from November's cool 50.9°F (10.5°C) to a wintry 39.7°F (4.3°C). December brings with it a nighttime average temperature of 28.6°F (-1.9°C).

Humidity

In December, the average relative humidity is 78%.

Rainfall

The month with the least rainfall is December, when the rain falls for 8.5 days and typically collects 1.73" (44mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Atwater, during December, snow falls for 4.9 days and regularly aggregates up to 1.69" (43mm) of snow. In Atwater, during the entire year, snow falls for 25.5 days and aggregates up to 9.09" (231mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:45 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 2 during December translates into these guidelines:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. 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. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Updated: Jul 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

During December, Atwater experiences an average high-temperature of 39.7°F (4.3°C) and a low-temperature of 28.6°F (-1.9°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December in Atwater is 78%.

What is the driest month?

The month with the least rainfall is December, when the rain falls for 8.5 days and typically collects 1.73" (44mm) of precipitation.

How much does it rain in December?

In Atwater, during December, the rain falls for 8.5 days and regularly aggregates up to 1.73" (44mm) of precipitation.

How much does it snow in December?

In Atwater, in December, during 4.9 snowfall days, 1.69" (43mm) 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 30min of daylight.

How many hours of daylight does Atwater have in December?

In Atwater, the average day length in December is 9h and 27min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:00 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:45 pm CST.

How many hours of sunshine does Atwater have in December?

In December, the average sunshine duration is 4.8h.

When is the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to the Sun's 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
Atwater, IL

Average temperature in December - Atwater, IL
  • Average high temperature in December: 39.7°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (34.2°F).

  • Average low temperature in December: 28.6°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 (22.3°F).

Average pressure in December
Atwater, IL

Average pressure in December - Atwater, IL
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Atwater, IL

Average wind speed in December - Atwater, IL
  • Average wind speed in December: 9.6mph

The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in December
Atwater, IL

Average humidity in December - Atwater, IL
  • Average humidity in December: 78%

The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Atwater, IL

Average rainfall in December - Atwater, IL
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is June (3.86").
The driest month (with the least rainfall) is December (1.73").

Average rainfall days in December
Atwater, IL

Average rainfall days in December - Atwater, IL
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.4 days).

Average snowfall in December
Atwater, IL

Average snowfall in December - Atwater, IL
  • Average snowfall in December: 1.69"

The month with the highest snowfall is February (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Atwater, IL

Average snowfall days in December - Atwater, IL
  • Average snowfall days in December: 4.9 days

The month with the highest number of snowfall days is January (8.5 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
Atwater, IL

Average daylight in December / Average sunshine in December - Atwater, IL
  • Average daylight in December: 9h and 3min

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 30min).

  • Average sunshine in December: 4h and 5min

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

Average sunshine days in December
Atwater, IL

Average sunshine days in December - Atwater, IL
  • Average sunshine days in December: 17.9 days

The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (10.6 days).

Average UV index in December
Atwater, IL

Average UV index in December - Atwater, 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
Atwater, IL

Average cloud cover in December - Atwater, IL
  • Average cloud cover in December: 50

The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July, August and September (Cloud cover 30).

Average visibility in December
Atwater, IL

Average visibility in December - Atwater, IL
  • Average visibility in December: 6mi

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

Atwater, Illinois, USA

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