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 sea temperature 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
During Chicago's transition into December, the average high-temperature lessens, moving from a chilly 46°F in November to a cold 35.8°F. December nights reflect a consistent temperature dip to a freezing cold 27.9°F, a slight descent from daytime peaks.Humidity
The average relative humidity in December is 80%.Rainfall
The month with the least rainfall in Chicago is December, when the rain falls for 8.8 days and typically collects 1.65" of precipitation.Snowfall
Months with snowfall in Chicago are January through May, November and December. In Chicago, during December, snow falls for 7.5 days and regularly aggregates up to 2.52" of snow. Throughout the year, in Chicago, there are 40.9 snowfall days, and 13.9" of snow is accumulated.Ocean temperature
In December, the average ocean temperature is 42.4°F.Note: Entering waters of 42.4°F is life-endangering. A mere moment in 55.4°F waters feels piercing cold, and below 50°F it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.
Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:58 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:29 pm CST.
Sunshine
The average sunshine in December in Chicago is 4h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: In December, a daily UV index of 1 turns into the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
FAQ
How cold is December in Chicago?
What is the average humidity in December in Chicago?
What is the driest month in Chicago?
How much does it rain in Chicago in December?
How much does it snow in Chicago in December?
What is the water temperature in December in Chicago?
What is the month with the shortest days in Chicago?
What is the average length of the day in December in Chicago?
When are sunrise and sunset in December in Chicago?
How long on average sun shines in December in Chicago?
When is the lowest UV index in Chicago?
How high is the UV index in December in Chicago?
Average temperature in December
Chicago, IL
- Average high temperature in December: 35.8°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 27.9°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in December
Chicago, IL
- Average pressure in December: 30.09"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
Chicago, IL
- Average wind speed in December: 11.7mph
The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in December
Chicago, IL
- Average humidity in December: 80%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Chicago, IL
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the least rainfall) is December (1.65").
Average rainfall days in December
Chicago, IL
- Average rainfall days in December: 8.8 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (5.5 days).
Average snowfall in December
Chicago, IL
- Average snowfall in December: 2.52"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Chicago, IL
- Average snowfall days in December: 7.5 days
The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Chicago, IL
- Average sea temperature in December: 42.4°F
The best month for swimming (with the highest average sea temperature) is August (73.9°F).
The coldest month (with the lowest average sea temperature) is February (36.9°F).
Average daylight in December /
Average sunshine in December
Chicago, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Chicago, IL
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in December
Chicago, IL
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Chicago, IL
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in December
Chicago, 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).
Chicago, Illinois, USA
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