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
With December's arrival, Smithboro's weather changes as the average high-temperature falls from a cool 51.8°F (11°C) in November to a wintry 41.5°F (5.3°C). Smithboro reports an average low-temperature of 29.8°F (-1.2°C) during the nights of December.Humidity
In December, the average relative humidity in Smithboro, Illinois, is 78%.Rainfall
In Smithboro, in December, it is raining for 7.2 days, with typically 1.61" (41mm) of accumulated precipitation. Throughout the year, there are 137.9 rainfall days, and 24.88" (632mm) of precipitation is accumulated.Snowfall
Months with snowfall in Smithboro are January through March, November and December. The month with the most snowfall is December, when snow falls for 4.1 days and typically aggregates up to 1.89" (48mm) of snow.Daylight
The month with the shortest days in Smithboro is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 6:57 am and sunset at 4:35 pm. On the last day of December, in Smithboro, sunrise is at 7:15 am and sunset at 4:45 pm CST.
Sunshine
In December, the average sunshine is 4.7h.UV index
The months with the lowest UV index in Smithboro, Illinois, 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 average individuals.Note: The daily high UV index of 2 in December translates into this advice:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Smithboro?
What is the average humidity in December in Smithboro?
How many days does it rain in December in Smithboro?
When does it snow the most in Smithboro?
How many days does it snow in December in Smithboro?
What is the month with the shortest days in Smithboro?
What is the average length of the day in December in Smithboro?
When is the sunrise / sunset in December in Smithboro?
How long on average sun shines in December in Smithboro?
What are the months with the lowest UV index in Smithboro?
What is the UV index intensity in December in Smithboro?
Average temperature in December
Smithboro, IL
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
Smithboro, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Smithboro, IL
- Average wind speed in December: 9.2mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).
Average humidity in December
Smithboro, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Smithboro, IL
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in December
Smithboro, IL
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Smithboro, IL
- Average snowfall in December: 1.89"
The month with the highest snowfall is December (1.89").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Smithboro, IL
- Average snowfall days in December: 4.1 days
The month with the highest number of snowfall days is January (5.8 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
Smithboro, IL
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).
Average sunshine days in December
Smithboro, IL
- Average sunshine days in December: 20 days
The month with the most sunshine days is December (20 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
Smithboro, IL
- Average UV index in December: 2
The months with the highest UV index are 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
Smithboro, IL
- Average cloud cover in December: 50
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in December
Smithboro, 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).
Smithboro, Illinois, USA
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