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 average high-temperature drops in December, from November's chilly 45.5°F (7.5°C) to an icy 34.2°F (1.2°C). An average low-temperature of 23.7°F (-4.6°C) marks the month of December.Humidity
In December, the average relative humidity is 82%.Rainfall
December is the month with the least rainfall in Big Rock. Rain falls for 7.8 days and accumulates 1.57" (40mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Big Rock. In Big Rock, in December, snow falls for 9.1 days, with typically accumulated 2.64" (67mm) of snow. Throughout the year, there are 44.6 snowfall days, and 15.2" (386mm) of snow is accumulated.Daylight
December has the shortest days of the year in Big Rock, with an average of 9h and 12min of daylight.On the first day of December in Big Rock, sunrise is at 7:02 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:33 pm CST.
Sunshine
In December, the average sunshine is 4.1h.UV index
The months with the lowest UV index in Big Rock, Illinois, are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Frequently asked questions
How cold is December in Big Rock?
What is the average humidity in December in Big Rock?
What is the driest month in Big Rock?
How many days does it rain in December in Big Rock?
How much does it snow in Big Rock in December?
What is the month with the shortest days in Big Rock?
How many hours of daylight does Big Rock have in December?
When are sunrise and sunset in December in Big Rock?
How many hours of sunshine does Big Rock have in December?
What are the months with the lowest UV index in Big Rock?
What is the UV index intensity in December in Big Rock?
Average temperature in December
Big Rock, IL
- Average high temperature in December: 34.2°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 23.7°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in December
Big Rock, IL
- Average pressure in December: 30.1"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
Big Rock, IL
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Big Rock, IL
- Average humidity in December: 82%
The months with the highest relative humidity are January, July and August (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Big Rock, IL
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is May (4.33").
The driest month (with the least rainfall) is December (1.57").
Average rainfall days in December
Big Rock, IL
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is July (18.2 days).
The month with the least rainy days is February (6 days).
Average snowfall in December
Big Rock, IL
- Average snowfall in December: 2.64"
The month with the highest snowfall is January (4.65").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Big Rock, IL
- Average snowfall days in December: 9.1 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
Big Rock, 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 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Big Rock, IL
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.3 days).
Average UV index in December
Big Rock, 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
Big Rock, 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 34).
Average visibility in December
Big Rock, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Big Rock, Illinois, USA
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