Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
As December commences in Naperville, the average high-temperature shows a reduction, transitioning from a chilly 45.9°F (7.7°C) in November to an icy 34.3°F (1.3°C). Naperville's nighttime temperature during December is consistently averaged at a freezing cold 24.4°F (-4.2°C).Humidity
In December, the average relative humidity in Naperville 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
January through April, October through December are months with snowfall. In Naperville, Illinois, in December, snow falls for 8.1 days, with typically accumulated 1.02" (26mm) of snow. In Naperville, during the entire year, snow falls for 38.7 days and aggregates up to 6.93" (176mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of December in Naperville, sunrise is at 7:00 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:32 pm CST.
Sunshine
The average sunshine in December in Naperville, Illinois, is 4.2h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 1 during December translates into these guidelines:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
How cold is it in Naperville in December?
What is the average humidity in December in Naperville?
What is the driest month in Naperville?
How much does it rain in Naperville in December?
How many days does it snow in December in Naperville?
What is the month with the shortest days in Naperville?
How many hours of daylight does Naperville have in December?
What time are sunrise and sunset in December in Naperville?
How long on average sun shines in December in Naperville?
When is the lowest UV index in Naperville?
What is the UV index intensity in December in Naperville?
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).
Average pressure in December
Naperville, 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
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).
Average humidity in December
Naperville, 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
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").
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).
Average snowfall in December
Naperville, 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
Naperville, 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
Naperville, 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
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).
Average UV index in December
Naperville, 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
Naperville, 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
Naperville, 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).
Naperville, Illinois, USA
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