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
With the onset of December, Green Rock experiences a modest temperature adjustment, with the average high-temperature receding from a frosty 46.9°F (8.3°C) in November to an icy 34.5°F (1.4°C). The nights of December in Green Rock, Illinois, anticipate an average low-temperature of 23.9°F (-4.5°C).Humidity
In Green Rock, the average relative humidity in December is 81%.Rainfall
The month with the least rainfall is December, when the rain falls for 4.1 days and typically collects 0.35" (9mm) of precipitation.Snowfall
January through April, September through December are months with snowfall. In Green Rock, Illinois, during December, snow falls for 5 days and regularly aggregates up to 0.39" (10mm) of snow. Throughout the year, in Green Rock, there are 24.5 snowfall days, and 4.09" (104mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December in Green Rock, sunrise is at 7:08 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:41 pm CST.
Sunshine
In Green Rock, the average sunshine in December is 4.2h.UV index
The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index, 2 during December, leads to the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
How cold is it in Green Rock in December?
What is the average humidity in December in Green Rock?
What is the driest month in Green Rock?
How many days does it rain in December in Green Rock?
How much does it snow in Green Rock in December?
What is the month with the shortest days in Green Rock?
How many hours of daylight does Green Rock have in December?
What time are sunrise and sunset in December in Green Rock?
How many hours of sunshine does Green Rock have in December?
What is the UV index intensity in December in Green Rock?
Average temperature in December
Green Rock, IL
- Average high temperature in December: 34.5°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 (28.2°F).
- Average low temperature in December: 23.9°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 (15.4°F).
Average pressure in December
Green Rock, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Green Rock, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in December
Green Rock, IL
- Average humidity in December: 81%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Green Rock, IL
- Average rainfall in December: 0.35"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days in December
Green Rock, IL
- Average rainfall days in December: 4.1 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in December
Green Rock, IL
- Average snowfall in December: 0.39"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in December
Green Rock, IL
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Green Rock, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
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 July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Green Rock, IL
- Average sunshine days in December: 22.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).
Average UV index in December
Green Rock, IL
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Green Rock, IL
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Green Rock, 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).
Green Rock, Illinois, USA
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