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
In Dennison, the average high-temperature in December drops from a cool 50.4°F (10.2°C) in November to an icy 39.6°F (4.2°C). December brings with it a nighttime average temperature of 28.4°F (-2°C) in Dennison.Humidity
In December, the average relative humidity is 81%.Rainfall
In December, the rain falls for 9.5 days. Throughout December, 2.32" (59mm) of precipitation is accumulated. Throughout the year, there are 159.3 rainfall days, and 34.41" (874mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Dennison, in December, snow falls for 5.5 days, with typically accumulated 1.69" (43mm) of snow. In Dennison, during the entire year, snow falls for 24.7 days and aggregates up to 8.66" (220mm) of snow.Daylight
December has the shortest days of the year in Dennison, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 6:52 am and sunset at 4:27 pm. On the last day of December, in Dennison, sunrise is at 7:10 am and sunset at 4:36 pm CST.
Sunshine
January and December, with an average of 4.3h of sunshine, are months with the least sunshine in Dennison.UV index
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Dennison. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 2 during December leads to these advisories:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
How cold is December in Dennison?
What is the average humidity in December in Dennison?
How many days does it rain in December in Dennison?
How many days does it snow in December in Dennison?
What is the month with the shortest days in Dennison?
How many hours of daylight does Dennison have in December?
When are sunrise and sunset in December in Dennison?
What is the month with the least sunshine in Dennison?
How many hours of sunshine does Dennison have in December?
What is the month with the lowest UV index in Dennison?
What is the UV index reading in December in Dennison?
Average temperature in December
Dennison, IL
- Average high temperature in December: 39.6°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in December: 28.4°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in December
Dennison, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Dennison, IL
- Average wind speed in December: 9.2mph
The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in December
Dennison, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Dennison, IL
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is April (4.96").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in December
Dennison, IL
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is May (20.6 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in December
Dennison, IL
- Average snowfall in December: 1.69"
The month with the highest snowfall is January (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Dennison, IL
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Dennison, IL
- Average daylight in December: 9h and 2min
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 24min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The months with the least sunshine are January and December (Average sunshine: 4h and 18min).
Average sunshine days in December
Dennison, IL
- Average sunshine days in December: 17.2 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is May (7.9 days).
Average UV index in December
Dennison, 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, October, November and December (UV index 2).
Average cloud cover in December
Dennison, IL
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are June, August and September (Cloud cover 32).
Average visibility in December
Dennison, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Dennison, Illinois, USA
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