![]() ![]() Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. On bright days sunglasses that block both UVA and UVB rays should be worn. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Note: The daily maximum UV index of 1 in December interpret into the following advice: A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals. UV indexThe months with the lowest UV index in Chicago are January and December, with an average maximum UV index of 1. The northwest suburbs were hit hard Saturday night with the snowfall just relentless on the roads. SunshineThe average sunshine in December in Chicago is 4h. Snow totals ranged from 0 to 2 inches south of the city and 3 to 6 inches north, Dutra said. On the last day of the month, sunrise is at 7:17 am and sunset at 4:29 pm CST. On the first day of December, sunrise is at 6:58 am and sunset at 4:20 pm. DaylightThe month with the shortest days in Chicago is December, with an average of 9h and 11min of daylight. Even a few minutes in 55.4☏ (13☌) water is uncomfortable, and swimming below 50☏ (10☌) may cause total loss of breathing control and cold shock, depending on a person's physique. Note: Swimming in 42.4☏ (5.8☌) is considered life-threatening. Ocean temperature In Chicago, Illinois, the average water temperature is 42.4☏ (5.8☌). In Chicago, during the entire year, snow falls for 40.9 days and aggregates up to 13.9" (353mm) of snow. In Chicago, snow falls for 7.5 days, with typically accumulated 2.52" (64mm) of snow. Snowfall January through May, November and December are months with snowfall. Rain falls for 8.8 days and accumulates 1.65" (42mm) of precipitation. RainfallDecember is the month with the least rainfall in Chicago. HumidityThe average relative humidity in December is 80%. The average low-temperature, in Chicago, is 27.9☏ (-2.3☌). TemperatureIn December, the average high-temperature decreases from a frosty 46☏ (7.8☌) in November to a cold 35.8☏ (2.1☌). December, the first month of the winter in Chicago, is still a cold month, with an average temperature fluctuating between 35.8☏ (2.1☌) and 27.9☏ (-2.3☌). ![]()
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