Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December shows a mild decline in the average high-temperature, falling from November's frosty 46.9°F (8.3°C) to a wintry 34.5°F (1.4°C). An average low-temperature of 23.9°F (-4.5°C) is recorded in the month of December in Silvis, Illinois.Humidity
In Silvis, the average relative humidity in December is 81%.Rainfall
The month with the least rainfall in Silvis, Illinois, is December, when the rain falls for 4.1 days and typically collects 0.35" (9mm) of precipitation.Snowfall
January through April, September through December are months with snowfall. In Silvis, in December, snow falls for 5 days, with typically accumulated 0.39" (10mm) of snow. Throughout the year, in Silvis, there are 24.5 snowfall days, and 4.09" (104mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:32 pm. On the last day of December, in Silvis, sunrise is at 7:28 am and sunset at 4:41 pm CST.
Sunshine
In December, the average sunshine is 4.2h.UV index
The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
How cold is it in Silvis in December?
What is the average humidity in December in Silvis?
What is the driest month in Silvis?
How many days does it rain in December in Silvis?
How much does it snow in Silvis in December?
What is the month with the shortest days in Silvis?
What is the average length of the day in December in Silvis?
When are sunrise and sunset in December in Silvis?
How many hours of sunshine does Silvis have in December?
How high is the UV index in December in Silvis?
Average temperature in December
Silvis, IL
- Average high temperature in December: 34.5°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).
Average pressure in December
Silvis, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Silvis, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in December
Silvis, IL
- Average humidity in December: 81%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Silvis, IL
- Average rainfall in December: 0.35"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days in December
Silvis, IL
- Average rainfall days in December: 4.1 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in December
Silvis, IL
- Average snowfall in December: 0.39"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in December
Silvis, IL
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Silvis, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Silvis, IL
- Average sunshine days in December: 22.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).
Average UV index in December
Silvis, IL
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Silvis, IL
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Silvis, 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).
Silvis, Illinois, USA
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