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
December shows a mild decline in the average high-temperature, falling from November's cool 53.2°F (11.8°C) to a frosty 43.3°F (6.3°C). The temperature dips to an average of 31.3°F (-0.4°C) during December nights.Humidity
In McLeansboro, the average relative humidity in December is 78%.Rainfall
In McLeansboro, during December, the rain falls for 9.4 days and regularly aggregates up to 2.2" (56mm) of precipitation. Throughout the year, there are 143.1 rainfall days, and 29.65" (753mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In December, it is snowing for 3.5 days. Throughout December, 1.38" (35mm) of snow is accumulated. In McLeansboro, during the entire year, snow falls for 16.7 days and aggregates up to 5.79" (147mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 6:52 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:10 am and sunset at 4:44 pm CST.
Sunshine
In December, the average sunshine in McLeansboro is 4.6h.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 estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 2 during December morphs into the following directions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Experience reduced UV exposure by about half when donning a wide-brim hat. 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
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does McLeansboro have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does McLeansboro have in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
McLeansboro, IL
- Average high temperature in December: 43.3°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (38.5°F).
- Average low temperature in December: 31.3°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
McLeansboro, IL
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
McLeansboro, IL
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are January, February and March (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in December
McLeansboro, IL
- Average humidity in December: 78%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
McLeansboro, IL
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is April (4.13").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in December
McLeansboro, IL
- Average rainfall days in December: 9.4 days
The month with the highest number of rainy days is May (16.2 days).
The months with the least rainy days are January and February (8.3 days).
Average snowfall in December
McLeansboro, IL
- Average snowfall in December: 1.38"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
McLeansboro, IL
- Average snowfall days in December: 3.5 days
The month with the highest number of snowfall days is January (4.8 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
McLeansboro, IL
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
McLeansboro, IL
- Average sunshine days in December: 19.3 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
McLeansboro, IL
- Average UV index in December: 2
The months with the highest UV index are May, 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
McLeansboro, IL
- Average cloud cover in December: 50
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June, July and August (Cloud cover 28).
Average visibility in December
McLeansboro, 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).
McLeansboro, Illinois, USA
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