December weather forecastIsland Lake, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Island Lake, Illinois, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 33.3°F (0.7°C).Temperature
In Island Lake, the beginning of December is marked by a lowered average high-temperature, shifting from November's chilly 45.1°F (7.3°C) to an icy 33.3°F (0.7°C). December in Island Lake is noted for a mean low-temperature of 23.2°F (-4.9°C).Humidity
The average relative humidity in December is 82%.Rainfall
December is the month with the least rainfall in Island Lake. Rain falls for 8 days and accumulates 1.1" (28mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Island Lake. In Island Lake, in December, during 10.8 snowfall days, 2.24" (57mm) of snow is typically accumulated. Throughout the year, in Island Lake, there are 48.9 snowfall days, and 14.76" (375mm) of snow is accumulated.Daylight
December has the shortest days of the year in Island Lake, Illinois, with an average of 9h and 6min of daylight.On the first day of December in Island Lake, sunrise is at 7:02 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:30 pm CST.
Sunshine
The average sunshine in December 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 health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 1 during December translates into the following guidance:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Island Lake, IL
- Average high temperature in December: 33.3°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in December: 23.2°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in December
Island Lake, 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
Island Lake, IL
- Average wind speed in December: 9.3mph
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
Island Lake, IL
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Island Lake, IL
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is June (3.15").
The driest month (with the least rainfall) is December (1.1").
Average rainfall days in December
Island Lake, IL
- Average rainfall days in December: 8 days
The month with the highest number of rainy days is July (18.8 days).
The months with the least rainy days are January and February (5.3 days).
Average snowfall in December
Island Lake, IL
- Average snowfall in December: 2.24"
The month with the highest snowfall is January (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Island Lake, IL
- Average snowfall days in December: 10.8 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
Island Lake, IL
- Average daylight in December: 9h and 6min
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 6min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Island Lake, IL
- Average sunshine days in December: 14.8 days
The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Island Lake, IL
- Average UV index in December: 1
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Island Lake, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in December
Island Lake, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
