December weather forecastLake Summerset, IL
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Lake Summerset, Illinois, with an average temperature fluctuating between 21.4°F (-5.9°C) and 31.5°F (-0.3°C).Temperature
December shows a mild decline in the average high-temperature, falling from November's chilly 43.7°F (6.5°C) to a freezing cold 31.5°F (-0.3°C). Nighttime temperatures consistently average 21.4°F (-5.9°C) during December.Humidity
In December, the average relative humidity is 83%.Rainfall
In Lake Summerset, during December, the rain falls for 3.5 days and regularly aggregates up to 0.35" (9mm) of precipitation. In Lake Summerset, during the entire year, the rain falls for 90.4 days and collects up to 7.09" (180mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Lake Summerset, during December, snow falls for 7.1 days and regularly aggregates up to 0.35" (9mm) of snow. In Lake Summerset, Illinois, during the entire year, snow falls for 32.7 days and aggregates up to 3.9" (99mm) of snow.Daylight
December has the shortest days of the year in Lake Summerset, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:34 pm CST.
Sunshine
The average sunshine in December is 3.9h.UV index
The months with the lowest UV index in Lake Summerset are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 1 during December leads to these advisories:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. When the Sun is at its strongest around midday, find shade and limit exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lake Summerset, IL
- Average high temperature in December: 31.5°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.8°F).
- Average low temperature in December: 21.4°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in December
Lake Summerset, IL
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Lake Summerset, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Lake Summerset, IL
- Average humidity in December: 83%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (76%).
Average rainfall in December
Lake Summerset, IL
- Average rainfall in December: 0.35"
The wettest month (with the highest rainfall) is June (0.98").
The driest month (with the least rainfall) is January (0.31").
Average rainfall days in December
Lake Summerset, IL
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is May (12.8 days).
The months with the least rainy days are January and February (2.4 days).
Average snowfall in December
Lake Summerset, IL
- Average snowfall in December: 0.35"
The month with the highest snowfall is January (1.22").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Lake Summerset, IL
- Average snowfall days in December: 7.1 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Lake Summerset, 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: 3h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The months with the least sunshine are January and February (Average sunshine: 3h and 30min).
Average sunshine days in December
Lake Summerset, IL
- Average sunshine days in December: 22.9 days
The months with the most sunshine days are November and December (22.9 days).
The month with the least sunshine days is June (13.4 days).
Average UV index in December
Lake Summerset, IL
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Lake Summerset, IL
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in December
Lake Summerset, IL
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, July, August and September (5mi).
