December weather forecast
Warrenville, IL

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Weather in December

December, the first month of the winter in Warrenville, is still a cold month, with temperature in the range of an average low of 24.4°F (-4.2°C) and an average high of 34.3°F (1.3°C).

Temperature

The onset of December results in a decrease in the average high-temperature, receding from a frosty 45.9°F (7.7°C) in November to an icy 34.3°F (1.3°C). During December nights, Warrenville witnesses a consistent average temperature of 24.4°F (-4.2°C).

Humidity

In Warrenville, the average relative humidity in December is 82%.

Rainfall

December is the month with the least rainfall. Rain falls for 6.4 days and accumulates 0.71" (18mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Warrenville, in December, snow falls for 8.1 days, with typically accumulated 1.02" (26mm) of snow. Throughout the year, there are 38.7 snowfall days, and 6.93" (176mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:22 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:32 pm CST.

Sunshine

In December, the average sunshine is 4.2h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum UV index of 1 during December leads to these instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.

Frequently asked questions

How cold is it in December?

An average high-temperature, in December, in Warrenville, is 34.3°F (1.3°C) and the average low-temperature is 24.4°F (-4.2°C). In July, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 82%.

What is the driest month?

December is the month with the least rainfall. Rain falls for 6.4 days and accumulates 0.71" (18mm) of precipitation.

How many days does it rain in December?

In December, the rain falls for 6.4 days. Throughout December, 0.71" (18mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 8.1 days. Throughout December, 1.02" (26mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

How many hours of daylight does Warrenville have in December?

In Warrenville, the average day length in December is 9h and 12min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:01 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:32 pm CST.

How many hours of sunshine does Warrenville have in December?

In Warrenville, the average sunshine duration in December is 4.2h.

When is the lowest UV index?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index intensity in December?

In Warrenville, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal hazard to health from 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
Warrenville, IL

Average temperature in December - Warrenville, IL
  • Average high temperature in December: 34.3°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.4°F).

  • Average low temperature in December: 24.4°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

Average pressure in December
Warrenville, IL

Average pressure in December - Warrenville, IL
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Warrenville, IL

Average wind speed in December - Warrenville, IL
  • Average wind speed in December: 9.1mph

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).

Average humidity in December
Warrenville, IL

Average humidity in December - Warrenville, IL
  • Average humidity in December: 82%

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

Average rainfall in December
Warrenville, IL

Average rainfall in December - Warrenville, IL
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.71").

Average rainfall days in December
Warrenville, IL

Average rainfall days in December - Warrenville, IL
  • Average rainfall days in December: 6.4 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (4.4 days).

Average snowfall in December
Warrenville, IL

Average snowfall in December - Warrenville, IL
  • Average snowfall in December: 1.02"

The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Warrenville, IL

Average snowfall days in December - Warrenville, IL
  • Average snowfall days in December: 8.1 days

The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Warrenville, IL

Average daylight in December / Average sunshine in December - Warrenville, IL
  • 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 1min

The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in December
Warrenville, IL

Average sunshine days in December - Warrenville, IL
  • Average sunshine days in December: 19.1 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (10.2 days).

Average UV index in December
Warrenville, IL

Average UV index in December - Warrenville, IL
  • Average UV index in December: 1

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Warrenville, IL

Average cloud cover in December - Warrenville, IL
  • Average cloud cover in December: 58

The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 31).

Average visibility in December
Warrenville, IL

Average visibility in December - Warrenville, 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).

Warrenville, Illinois, USA

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