December weather forecastVergennes, IL
December
Weather in December
The first month of the winter, December, is also a frosty month in Vergennes, Illinois, with an average temperature ranging between min 31.1°F (-0.5°C) and max 43.5°F (6.4°C).Temperature
As December commences, the average high-temperature shows a reduction, transitioning from a cool 53.6°F (12°C) in November to a chilly 43.5°F (6.4°C). Throughout December, an average nighttime temperature of 31.1°F (-0.5°C) is experienced.Humidity
In December, the average relative humidity is 77%.Rainfall
In December, in Vergennes, the rain falls for 8.2 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. Throughout the year, in Vergennes, there are 147.6 rainfall days, and 29.17" (741mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Vergennes, during December, snow falls for 3.7 days and regularly aggregates up to 0.87" (22mm) of snow. In Vergennes, during the entire year, snow falls for 18 days and aggregates up to 4.53" (115mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 6:54 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 4:48 pm CST.
Sunshine
In Vergennes, the average sunshine in December is 4.8h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Vergennes, IL
- Average high temperature in December: 43.5°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
Vergennes, 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 (29.93"Hg).
Average wind speed in December
Vergennes, IL
- Average wind speed in December: 8.9mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in December
Vergennes, IL
- Average humidity in December: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Vergennes, IL
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in December
Vergennes, IL
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (8.2 days).
Average snowfall in December
Vergennes, IL
- Average snowfall in December: 0.87"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Vergennes, IL
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (5.4 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
Vergennes, IL
- Average daylight in December: 9h and 36min
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 36min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Vergennes, IL
- Average sunshine days in December: 19.2 days
The months with the most sunshine days are October and November (19.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in December
Vergennes, 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
Vergennes, IL
- Average cloud cover in December: 49
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in December
Vergennes, 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).
