December weather forecast
Anna, IL

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Weather in December

December, the first month of the winter in Anna, is still a chilly month, with temperature in the range of an average low of 32.2°F (0.1°C) and an average high of 44.8°F (7.1°C).

Temperature

As Anna enters December, the average high-temperature decreases from the a fresh 54.5°F (12.5°C) of November to a chilly 44.8°F (7.1°C). Anna in December anticipates an average nighttime temperature of 32.2°F (0.1°C).

Humidity

The average relative humidity in December is 78%.

Rainfall

In Anna, in December, it is raining for 9.2 days, with typically 1.81" (46mm) of accumulated precipitation. In Anna, during the entire year, the rain falls for 143 days and collects up to 27.44" (697mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Anna, during December, snow falls for 2.6 days and regularly aggregates up to 1.1" (28mm) of snow. Throughout the year, there are 14.9 snowfall days, and 6.06" (154mm) of snow is accumulated.

Daylight

With an average of 9h and 36min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:53 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:11 am and sunset at 4:49 pm CST.

Sunshine

In Anna, the average sunshine in December is 4.8h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily maximum UV index of 2 in December translates into the following instructions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in December?

The high-temperature, in December, in Anna, records 44.8°F (7.1°C), while the low-temperature is 32.2°F (0.1°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is computed to be 84.2°F (29°C).

What is the average humidity in December?

The average relative humidity in December is 78%.

How much does it rain in December?

In Anna, in December, during 9.2 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

How much does it snow in December?

In Anna, during December, snow falls for 2.6 days and regularly aggregates up to 1.1" (28mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 36min of daylight.

What is the average length of the day in December?

In December, the average day length in Anna is 9h and 38min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 6:53 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 4:49 pm CST.

How long on average sun shines in December?

In Anna, Illinois, the average sunshine duration in December is 4.8h.

What is the month with the lowest UV index?

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

How high is the UV index in December in Anna?

In Anna, 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 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
Anna, IL

Average temperature in December - Anna, IL
  • Average high temperature in December: 44.8°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in December: 32.2°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

Average pressure in December
Anna, IL

Average pressure in December - Anna, IL
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Anna, IL

Average wind speed in December - Anna, IL
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is January (9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

Average humidity in December
Anna, IL

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

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Anna, IL

Average rainfall in December - Anna, IL
  • Average rainfall in December: 1.81"

The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is September (1.3").

Average rainfall days in December
Anna, IL

Average rainfall days in December - Anna, IL
  • Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is January (8.4 days).

Average snowfall in December
Anna, IL

Average snowfall in December - Anna, IL
  • Average snowfall in December: 1.1"

The month with the highest snowfall is February (1.89").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Anna, IL

Average snowfall days in December - Anna, IL
  • Average snowfall days in December: 2.6 days

The month with the highest number of snowfall days is January (4.6 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
Anna, IL

Average daylight in December / Average sunshine in December - Anna, IL
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in December
Anna, IL

Average sunshine days in December - Anna, IL
  • Average sunshine days in December: 19.6 days

The month with the most sunshine days is October (21 days).
The month with the least sunshine days is July (12.8 days).

Average UV index in December
Anna, IL

Average UV index in December - Anna, IL
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover in December
Anna, IL

Average cloud cover in December - Anna, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).

Average visibility in December
Anna, IL

Average visibility in December - Anna, 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).

Anna, Illinois, USA

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