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
The shift from November to December involves a decrease in the average high-temperature, dropping from a chilly 48.7°F (9.3°C) to an icy 37.6°F (3.1°C). December nights in Rantoul cool down to an average low-temperature of 27.5°F (-2.5°C).Humidity
In December, the average relative humidity is 80%.Rainfall
In December, in Rantoul, the rain falls for 6.9 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. In Rantoul, during the entire year, the rain falls for 121.5 days and collects up to 13.46" (342mm) of precipitation.Snowfall
Months with snowfall in Rantoul are January through April, November and December. In December, it is snowing for 6.1 days. Throughout December, 0.83" (21mm) of snow is accumulated. In Rantoul, during the entire year, snow falls for 26.9 days and aggregates up to 3.78" (96mm) of snow.Daylight
December has the shortest days of the year in Rantoul, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 6:56 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:36 pm CST.
Sunshine
In Rantoul, the average sunshine in December is 4.5h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 2 in December translates into this advice:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold in Rantoul?
What is the average humidity in December in Rantoul?
How much does it rain in Rantoul in December?
How many days does it snow in December in Rantoul?
What is the month with the shortest days in Rantoul?
How many hours of daylight does Rantoul have in December?
When is the sunrise / sunset in December in Rantoul?
How long on average sun shines in December in Rantoul?
When is the lowest UV index in Rantoul?
What is the UV index reading in December in Rantoul?
Average temperature in December
Rantoul, IL
- Average high temperature in December: 37.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Rantoul, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Rantoul, IL
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Rantoul, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Rantoul, IL
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is May (1.77").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days in December
Rantoul, IL
- Average rainfall days in December: 6.9 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Rantoul, IL
- Average snowfall in December: 0.83"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Rantoul, IL
- Average snowfall days in December: 6.1 days
The month with the highest number of snowfall days is January (7.9 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
Rantoul, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Rantoul, IL
- Average sunshine days in December: 19.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in December
Rantoul, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Rantoul, IL
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Rantoul, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Rantoul, Illinois, USA
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