December weather forecastSouth Chicago Heights, IL
December
Weather in December
December, the first month of the winter in South Chicago Heights, is also an icy month, with an average temperature varying between 35.6°F (2°C) and 25.9°F (-3.4°C).Temperature
South Chicago Heights's December weather comes with a decrease in average high-temperatures, moving from a frosty 47.1°F (8.4°C) in November to a wintry 35.6°F (2°C). During the December nights, an average temperature of 25.9°F (-3.4°C) is observed.Humidity
In South Chicago Heights, the average relative humidity in December is 81%.Rainfall
In December, the rain falls for 8.5 days. Throughout December, 1.89" (48mm) of precipitation is accumulated. In South Chicago Heights, during the entire year, the rain falls for 167.4 days and collects up to 35" (889mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In South Chicago Heights, in December, snow falls for 9.8 days, with typically accumulated 3.07" (78mm) of snow. In South Chicago Heights, during the entire year, snow falls for 47.8 days and aggregates up to 20.04" (509mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in South Chicago Heights.On the first day of the month, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of December, sunrise is at 7:16 am and sunset at 4:30 pm CST.
Sunshine
In December, the average sunshine is 4h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: In December, the maximum UV index of 1 translates into these guidelines:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Chicago Heights, IL
- Average high temperature in December: 35.6°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
South Chicago Heights, 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
South Chicago Heights, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in December
South Chicago Heights, 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
South Chicago Heights, IL
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is November (1.81").
Average rainfall days in December
South Chicago Heights, IL
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in December
South Chicago Heights, IL
- Average snowfall in December: 3.07"
The month with the highest snowfall is February (5.35").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
South Chicago Heights, IL
- Average snowfall days in December: 9.8 days
The month with the highest number of snowfall days is January (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
South Chicago Heights, 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 48min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
South Chicago Heights, IL
- Average sunshine days in December: 14 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is July (7.8 days).
Average UV index in December
South Chicago Heights, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
South Chicago Heights, 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 33).
Average visibility in December
South Chicago Heights, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
