December weather forecastMokena, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Mokena, Illinois, with an average temperature varying between 35.1°F (1.7°C) and 25°F (-3.9°C).Temperature
December comes with a drop in the average high-temperature, falling from November's chilly 46.9°F (8.3°C) to an icy 35.1°F (1.7°C). In Mokena, the average nighttime temperature during December is a freezing cold 25°F (-3.9°C).Humidity
The average relative humidity in December is 81%.Rainfall
The months with the least rainfall are February and December Rain falls for 7.6 days and accumulates 1.61" (41mm) of rain.Snowfall
Months with snowfall are January through April, October through December. In Mokena, in December, snow falls for 9 days, with typically accumulated 2.44" (62mm) of snow. In Mokena, during the entire year, snow falls for 42.2 days and aggregates up to 14.65" (372mm) 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 6:59 am and sunset at 4:22 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:31 pm CST.
Sunshine
In Mokena, Illinois, the average sunshine in December is 4h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for average individuals.Note: In December, a daily maximum UV index of 1 leads to the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mokena, IL
- Average high temperature in December: 35.1°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 (29.3°F).
- Average low temperature in December: 25°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 (17.4°F).
Average pressure in December
Mokena, 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
Mokena, IL
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Mokena, IL
- Average humidity in December: 81%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Mokena, IL
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is May (4.21").
The driest months (with the least rainfall) are February and December (1.61").
Average rainfall days in December
Mokena, IL
- Average rainfall days in December: 7.6 days
The months with the highest number of rainy days are June and July (17.3 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Mokena, IL
- Average snowfall in December: 2.44"
The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Mokena, IL
- Average snowfall days in December: 9 days
The month with the highest number of snowfall days is January (12.3 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
Mokena, 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 0min
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 36min).
Average sunshine days in December
Mokena, IL
- Average sunshine days in December: 15.6 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in December
Mokena, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Mokena, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Mokena, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
