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 move into December indicates a reduction in the average high-temperature, down from November's cool 50.4°F (10.2°C) to an icy 39.2°F (4°C). Throughout the month of December, the average temperature dips to a subzero cold 28.4°F (-2°C) at night.Humidity
The average relative humidity in December is 79%.Rainfall
In Shelbyville, in December, it is raining for 5.9 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, in Shelbyville, there are 116.5 rainfall days, and 11.54" (293mm) of precipitation is accumulated.Snowfall
Months with snowfall in Shelbyville are January through March, November and December. In Shelbyville, during December, snow falls for 4 days and regularly aggregates up to 0.67" (17mm) of snow. In Shelbyville, Illinois, during the entire year, snow falls for 19 days and aggregates up to 2.8" (71mm) of snow.Daylight
December has the shortest days of the year in Shelbyville, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 6:56 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:15 am and sunset at 4:41 pm CST.
Sunshine
In Shelbyville, the average sunshine in December is 4.5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Shelbyville, Illinois. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
How cold is December in Shelbyville?
What is the average humidity in December in Shelbyville?
How much does it rain in Shelbyville in December?
How many days does it snow in December in Shelbyville?
What is the month with the shortest days in Shelbyville?
How many hours of daylight does Shelbyville have in December?
When are sunrise and sunset in December in Shelbyville?
How many hours of sunshine does Shelbyville have in December?
What is the month with the lowest UV index in Shelbyville?
How high is the UV index in December in Shelbyville?
Average temperature in December
Shelbyville, IL
- Average high temperature in December: 39.2°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in December: 28.4°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in December
Shelbyville, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Shelbyville, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Shelbyville, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Shelbyville, IL
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is June (1.46").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in December
Shelbyville, IL
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in December
Shelbyville, IL
- Average snowfall in December: 0.67"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Shelbyville, IL
- Average snowfall days in December: 4 days
The month with the highest number of snowfall days is February (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Shelbyville, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
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 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Shelbyville, IL
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is December (22.1 days).
The month with the least sunshine days is June (13.5 days).
Average UV index in December
Shelbyville, 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
Shelbyville, IL
- Average cloud cover in December: 53
The months with the most cloud cover are January and February (Cloud cover 55).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in December
Shelbyville, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Shelbyville, Illinois, USA
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