December weather forecastSomonauk, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Somonauk, Illinois, with an average temperature ranging between max 34.2°F (1.2°C) and min 23.9°F (-4.5°C).Temperature
Somonauk's December weather comes with a decrease in average high-temperatures, moving from a chilly 45.5°F (7.5°C) in November to an icy 34.2°F (1.2°C). December brings with it a nighttime average temperature of 23.9°F (-4.5°C) in Somonauk.Humidity
The average relative humidity in December is 82%.Rainfall
In December, the rain falls for 8 days. Throughout December, 1.77" (45mm) of precipitation is accumulated. In Somonauk, during the entire year, the rain falls for 162.1 days and collects up to 33.54" (852mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Somonauk, during December, snow falls for 8.9 days and regularly aggregates up to 2.6" (66mm) of snow. In Somonauk, during the entire year, snow falls for 43.6 days and aggregates up to 16.73" (425mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:02 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:34 pm CST.
Sunshine
In December, the average sunshine is 4.1h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 1 suggests this advice:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Somonauk, 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 (27.5°F).
- Average low temperature in December: 23.9°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 (15.6°F).
Average pressure in December
Somonauk, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Somonauk, IL
- Average wind speed in December: 9.2mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Somonauk, IL
- Average humidity in December: 82%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Somonauk, IL
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is January (1.69").
Average rainfall days in December
Somonauk, IL
- Average rainfall days in December: 8 days
The months with the highest number of rainy days are June and July (19.3 days).
The month with the least rainy days is January (5.5 days).
Average snowfall in December
Somonauk, IL
- Average snowfall in December: 2.6"
The month with the highest snowfall is January (4.61").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Somonauk, IL
- Average snowfall days in December: 8.9 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Somonauk, IL
- Average daylight in December: 9h and 12min
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 6min
The months with the most sunshine are June, July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Somonauk, IL
- Average sunshine days in December: 15.6 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is July (8.2 days).
Average UV index in December
Somonauk, IL
- Average UV index in December: 1
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Somonauk, IL
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in December
Somonauk, 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).
