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
In December, the average high-temperature in Wheaton goes from a chilly 45.5°F (7.5°C) in November to a cold 34.3°F (1.3°C). Nighttime temperatures hover around an average low of 24.3°F (-4.3°C) in December.Humidity
In Wheaton, the average relative humidity in December is 81%.Rainfall
The months with the least rainfall are November and December Rain falls for 7.8 days and accumulates 1.65" (42mm) of rain.Snowfall
January through May, October through December are months with snowfall. In Wheaton, during December, snow falls for 9.7 days and regularly aggregates up to 3.03" (77mm) of snow. In Wheaton, during the entire year, snow falls for 47 days and aggregates up to 20.2" (513mm) 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 the month, sunrise is at 7:01 am and sunset at 4:22 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:31 pm CST.
Sunshine
In Wheaton, Illinois, the average sunshine in December is 4.1h.UV index
In Wheaton, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Around midday, solar radiation is most harmful; hence, exposure should be limited. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Wheaton have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Wheaton have in December?
What is the UV index intensity in December?
Average temperature in December
Wheaton, 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°F).
- Average low temperature in December: 24.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in December
Wheaton, 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
Wheaton, IL
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Wheaton, IL
- Average humidity in December: 81%
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
Wheaton, IL
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").
Average rainfall days in December
Wheaton, IL
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in December
Wheaton, IL
- Average snowfall in December: 3.03"
The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Wheaton, IL
- Average snowfall days in December: 9.7 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Wheaton, 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 month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Wheaton, IL
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).
Average UV index in December
Wheaton, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Wheaton, IL
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Wheaton, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Wheaton, Illinois, USA
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