December is a very cold and slightly rainy time for sunbathing in Illinois, and not recommended. December is a good month for swimming in Illinois with warm sea temperatures. Consider visiting Illinois in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for December.
The average maximum temperature in Illinois in December is 2°. The average maximum temperature is 10° in the previous month and -0° in the next month.
The average temperature in Illinois in December is -1°. The average temperature ranges is 6° in the previous month and -4° in the next month.
The average minimum temperature in Illinois in December is -4°. The minimum temperature is 2° in the previous month and -7° in the next month.
The average day light hours per day in Illinois in December are 9.2 and there are 3.6 hours of sunshine per day on average during December making it not a particularly sunny month.
The ultraviolet index in Illinois in December is typically 1.5 during December. An ultraviolet index reading of 0 to 2 indicates low danger from the sun's UV rays for the average person. Most people will be able to spend several hours in the sun with out a problem, however unprotected skin risks burning in less than 1 hour. Wear sunglasses on bright days. Only those that burn easily will need to apply sunscreen. Watch out for relections from water that may increase ultraviolet exposure.
The average sea water temperature in Illinois in December is 22.3° which is warm and pleasant for relaxing and swimming for long periods.
The average total rainfall in Illinois in December is 54.3cm and on average there are 13.5 rainy days in December making it a slightly wet time to visit the beach.
The maximum dew point (an indicator of humidity) in Illinois in December is -2° which is a bit dry for some. The dew point is 3° in the previous month and -5° in the next month.
The average maximum relative humidity in Illinois in December is typically 86.1%. The maximum relative humidity is 81.1% in the previous month and 84% in the next month.
The average relative humidity in Illinois in December is typically 74.4%. The average relative humidity is 65.8% in the previous month and 72% in the next month.
The average maximum wind speed in Illinois in December is typically 28kmh. The average maximum wind speed is 29kmh in the previous month and 29kmh in the next month.
The average wind speed in Illinois in December is typically 16kmh. The average wind speed is 16kmh in the previous month and 17kmh in the next month.
The average wind direction in Illinois in December is from the West-Southwest.
