December weather forecastTinley Park, IL
December
Weather in December
December welcomes the full-fledged winter season in Tinley Park. The city gets a wintry touch with the decreasing temperatures and the presence of frost. Snowfall becomes a common feature transforming the city into a winter wonderland. It's the time when the city is most cloud-covered and witnesses the shortest days of the year. December records a substantial drop in temperatures with a maximum of 35.4°F (1.9°C) and dropping to a low of 25.7°F (-3.5°C).Temperature
A moderate decline in the average high-temperature is seen during December, decreasing from a chilly 46.9°F (8.3°C) in November to a cold 35.4°F (1.9°C). An average temperature of 25.7°F (-3.5°C) marks the nights in December.Humidity
In December, the average relative humidity is 81%.Rainfall
January, February and December are months with the least rain when the rain falls for 4.8 days and typically aggregates up to 0.55" (14mm) of rain.Snowfall
Months with snowfall are January through April, October through December. In Tinley Park, in December, snow falls for 6.6 days, with typically accumulated 0.47" (12mm) of snow. Throughout the year, there are 34.2 snowfall days, and 4.8" (122mm) of snow is accumulated.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 4:21 pm. On the last day of December, in Tinley Park, sunrise is at 7:17 am and sunset at 4:31 pm CST.
Sunshine
In December, the average sunshine is 4.1h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 1 during December translates into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. To protect against the Sun's most potent rays, avoid direct exposure around midday. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Tinley Park, IL
- Average high temperature in December: 35.4°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure in December
Tinley Park, 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
Tinley Park, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in December
Tinley Park, 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
Tinley Park, IL
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is May (1.54").
The driest months (with the least rainfall) are January, February and December (0.55").
Average rainfall days in December
Tinley Park, IL
- Average rainfall days in December: 4.8 days
The month with the highest number of rainy days is July (14.1 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in December
Tinley Park, IL
- Average snowfall in December: 0.47"
The month with the highest snowfall is January (1.3").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Tinley Park, IL
- Average snowfall days in December: 6.6 days
The month with the highest number of snowfall days is January (10.3 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
Tinley Park, 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 month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Tinley Park, IL
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in December
Tinley Park, 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
Tinley Park, IL
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Tinley Park, 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).
