December weather forecastSpillertown, IL
December
Weather in December
The first month of the winter, December, is still a chilly month in Spillertown, Illinois, with temperature in the range of an average high of 43.9°F (6.6°C) and an average low of 31.8°F (-0.1°C).Temperature
The transition into December indicates a reduction in the average high-temperature, down to a frosty 43.9°F (6.6°C) from November's fresh 53.8°F (12.1°C). In the month of December, Spillertown's average low-temperature falls to a subzero cold 31.8°F (-0.1°C).Humidity
In Spillertown, the average relative humidity in December is 78%.Rainfall
In Spillertown, during December, the rain falls for 9.1 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, there are 137.6 rainfall days, and 23.03" (585mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Spillertown. In Spillertown, during December, snow falls for 2.7 days and regularly aggregates up to 0.91" (23mm) of snow. Throughout the year, there are 14.5 snowfall days, and 4.13" (105mm) of snow is accumulated.Daylight
The month with the shortest days in Spillertown is December, with an average of 9h and 36min of daylight.On the first day of December in Spillertown, sunrise is at 6:52 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 4:47 pm CST.
Sunshine
In Spillertown, the average sunshine in December is 4.7h.UV index
The months with the lowest UV index in Spillertown are January, February and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Spillertown, IL
- Average high temperature in December: 43.9°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
- Average low temperature in December: 31.8°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in December
Spillertown, 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
Spillertown, IL
- Average wind speed in December: 8.8mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in December
Spillertown, IL
- Average humidity in December: 78%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Spillertown, IL
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").
Average rainfall days in December
Spillertown, IL
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).
Average snowfall in December
Spillertown, IL
- Average snowfall in December: 0.91"
The months with the highest snowfall are January and February (0.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Spillertown, IL
- Average snowfall days in December: 2.7 days
The month with the highest number of snowfall days is February (4.3 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
Spillertown, IL
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 4h and 42min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Spillertown, IL
- Average sunshine days in December: 18.6 days
The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in December
Spillertown, 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 and December (UV index 2).
Average cloud cover in December
Spillertown, IL
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are June, August and September (Cloud cover 28).
Average visibility in December
Spillertown, 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).
