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
As December arrives, Coal Valley's weather displays a decrease in high-temperatures, transitioning from November's frosty 47.1°F (8.4°C) to an icy 34.7°F (1.5°C). The average low-temperature of 23.9°F (-4.5°C) is witnessed during December.Humidity
The average relative humidity in December in Coal Valley is 81%.Rainfall
December is the month with the least rainfall in Coal Valley. Rain falls for 3.2 days and accumulates 0.24" (6mm) of precipitation.Snowfall
Months with snowfall in Coal Valley are January through April, October through December. In Coal Valley, during December, snow falls for 3.7 days and regularly aggregates up to 0.16" (4mm) of snow. In Coal Valley, during the entire year, snow falls for 18.4 days and aggregates up to 2.64" (67mm) of snow.Daylight
The month with the shortest days in Coal Valley is December, with an average of 9h and 12min of daylight.On the first day of December in Coal Valley, sunrise is at 7:09 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:42 pm CST.
Sunshine
In Coal Valley, the average sunshine in December is 4.3h.UV index
In Coal Valley, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: In December, a daily UV index of 2 turns into the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Coal Valley in December?
What is the average humidity in December in Coal Valley?
What is the driest month in Coal Valley?
How many days does it rain in December in Coal Valley?
How many days does it snow in December in Coal Valley?
What is the month with the shortest days in Coal Valley?
How many hours of daylight does Coal Valley have in December?
When are sunrise and sunset in December in Coal Valley?
How long on average sun shines in December in Coal Valley?
What is the UV index reading in December in Coal Valley?
Average temperature in December
Coal Valley, IL
- Average high temperature in December: 34.7°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 (64.9°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in December
Coal Valley, 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 (29.9"Hg).
Average wind speed in December
Coal Valley, 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
Coal Valley, 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
Coal Valley, IL
- Average rainfall in December: 0.24"
The wettest month (with the highest rainfall) is May (0.94").
The driest month (with the least rainfall) is December (0.24").
Average rainfall days in December
Coal Valley, IL
- Average rainfall days in December: 3.2 days
The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is January (1.8 days).
Average snowfall in December
Coal Valley, IL
- Average snowfall in December: 0.16"
The month with the highest snowfall is January (1.06").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Coal Valley, IL
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (5.5 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
Coal Valley, 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Coal Valley, IL
- Average sunshine days in December: 25.8 days
The month with the most sunshine days is December (25.8 days).
The month with the least sunshine days is June (15.4 days).
Average UV index in December
Coal Valley, IL
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Coal Valley, IL
- Average cloud cover in December: 55
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
Coal Valley, 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).
Coal Valley, Illinois, USA
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