December weather forecastSims, IL
December
Weather in December
The first month of the winter, December, is also a frosty month in Sims, Illinois, with an average temperature fluctuating between 43.2°F (6.2°C) and 31.1°F (-0.5°C).Temperature
Sims in December demonstrates a small temperature transition, adjusting from an average high of a fresh 52.9°F (11.6°C) in November to a chilly 43.2°F (6.2°C). In Sims, December is marked by an average low-temperature of 31.1°F (-0.5°C).Humidity
In Sims, the average relative humidity in December is 78%.Rainfall
In Sims, in December, during 10.9 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. In Sims, during the entire year, the rain falls for 166.4 days and collects up to 37.32" (948mm) of precipitation.Snowfall
Months with snowfall in Sims are January through April, November and December. In Sims, during December, snow falls for 4.1 days and regularly aggregates up to 1.42" (36mm) of snow. In Sims, during the entire year, snow falls for 21.2 days and aggregates up to 6.97" (177mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 6:52 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:11 am and sunset at 4:43 pm CST.
Sunshine
The average sunshine in December in Sims is 4.6h.UV index
The months with the lowest UV index in Sims are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. To guard against the harmful effects of the Sun, minimize exposure during midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sims, IL
- Average high temperature in December: 43.2°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25°F).
Average pressure in December
Sims, IL
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Sims, IL
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in December
Sims, IL
- Average humidity in December: 78%
The months with the highest relative humidity are May and July (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Sims, IL
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is April (4.96").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in December
Sims, IL
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in December
Sims, IL
- Average snowfall in December: 1.42"
The months with the highest snowfall are January and February (2.01").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Sims, IL
- Average snowfall days in December: 4.1 days
The month with the highest number of snowfall days is January (6.7 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
Sims, IL
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 36min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Sims, IL
- Average sunshine days in December: 17.6 days
The month with the most sunshine days is October (17.9 days).
The month with the least sunshine days is May (9 days).
Average UV index in December
Sims, IL
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Sims, IL
- Average cloud cover in December: 50
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in December
Sims, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
