December weather forecastRound Lake, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Round Lake, Illinois, with an average temperature ranging between max 33.6°F (0.9°C) and min 23.9°F (-4.5°C).Temperature
In Round 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 33.6°F (0.9°C). Round Lake in December experiences a low-temperature average of 23.9°F (-4.5°C).Humidity
The average relative humidity in December is 81%.Rainfall
December is the month with the least rainfall. Rain falls for 8.2 days and accumulates 0.98" (25mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In December, in Round Lake, it is snowing for 10.4 days. Throughout December, 2.17" (55mm) of snow is accumulated. In Round Lake, during the entire year, snow falls for 49.5 days and aggregates up to 13.54" (344mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of December in Round Lake, sunrise is at 7:02 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:29 pm CST.
Sunshine
In December, the average sunshine is 4h.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 low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Round Lake, IL
- Average high temperature in December: 33.6°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 (27.5°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in December
Round Lake, IL
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Round Lake, IL
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Round Lake, IL
- Average humidity in December: 81%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Round Lake, IL
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is April (2.72").
The driest month (with the least rainfall) is December (0.98").
Average rainfall days in December
Round Lake, IL
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is July (17.5 days).
The month with the least rainy days is February (5 days).
Average snowfall in December
Round Lake, IL
- Average snowfall in December: 2.17"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Round Lake, IL
- Average snowfall days in December: 10.4 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Round 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 August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Round Lake, IL
- Average sunshine days in December: 15.4 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Round Lake, 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
Round Lake, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 30).
Average visibility in December
Round Lake, IL
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
