December weather forecast and climate
Naperville, IL

A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois
A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois

Weather in December

December, the first month of the winter, in Naperville, is also a wintry month, with average temperature varying between 34.3°F (1.3°C) and 24.4°F (-4.2°C).

Temperature

In December, the average high-temperature drops, from a chilly 45.9°F (7.7°C) in November, to a cold 34.3°F (1.3°C). In December, in Naperville, Illinois, the average low-temperature is 24.4°F (-4.2°C).

Humidity

In December, the average relative humidity is 82%.

Rainfall

The month with the least rainfall is December when the rain falls for 6.4 days and typically collects 0.71" (18mm) of precipitation.

Snowfall

Months with snowfall in Naperville are January through April, October through December. In Naperville, during 8.1 snowfall days, 1.02" (26mm) of snow is typically accumulated. 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 in Naperville, Illinois, with an average of 9.2h of daylight.

Sunshine

In Naperville, the average sunshine is 4.2h.

UV index

Months with the lowest UV index in Naperville, Illinois, are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 1 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. 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 average humidity in December in Naperville?

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

What is the driest month in Naperville?

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

How much does it rain in Naperville in December?

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

How much does it snow in Naperville in December?

In Naperville, during December, snow falls for 8.1 days and regularly aggregates up to 1.02" (26mm) of snow.

What is the month with the shortest days in Naperville?

December has the shortest days of the year in Naperville, Illinois, with an average of 9.2h of daylight.

How many hours of daylight does Naperville have in December?

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

How many hours of sunshine does Naperville have in December?

The average sunshine in December in Naperville is 4.2h.

What are the months with the lowest UV index in Naperville?

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

What is the UV index intensity in December in Naperville?

The average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.

Average temperature in December
Naperville, IL

Average temperature in December - Naperville, 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).

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Average pressure in December
Naperville, IL

Average pressure in December - Naperville, IL
  • Average pressure in December: 30.09"

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

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Average wind speed in December
Naperville, IL

Average wind speed in December - Naperville, 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).

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Average humidity in December
Naperville, IL

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

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

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Average rainfall in December
Naperville, IL

Average rainfall in December - Naperville, 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").

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Average rainfall days in December
Naperville, IL

Average rainfall days in December - Naperville, 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).

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Average snowfall in December
Naperville, IL

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

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

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Average snowfall days in December
Naperville, IL

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

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

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

Average daylight in December / Average sunshine in December - Naperville, IL
  • 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: 4.2h

Months with the most sunshine are July and August (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 3.8h).

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Average sunshine days in December
Naperville, IL

Average sunshine days in December - Naperville, 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).

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Average UV index in December
Naperville, IL

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

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

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Average cloud cover in December
Naperville, IL

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

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

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Average visibility in December
Naperville, IL

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

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

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