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 brings a decrease in the average high-temperature, falling from November's fresh 52.7°F (11.5°C) to a chilly 43.2°F (6.2°C). An average low-temperature of 30.9°F (-0.6°C) is common during the nights of December.Humidity
In December, the average relative humidity is 78%.Rainfall
In Bonnie, during December, the rain falls for 8.9 days and regularly aggregates up to 2.01" (51mm) of precipitation. In Bonnie, Illinois, during the entire year, the rain falls for 145.8 days and collects up to 29.13" (740mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Bonnie, in December, snow falls for 2.9 days, with typically accumulated 1.06" (27mm) of snow. Throughout the year, in Bonnie, there are 15.4 snowfall days, and 5.87" (149mm) of snow is accumulated.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 6:53 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 4:45 pm CST.
Sunshine
The average sunshine in December is 4.8h.UV index
January, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 2 during December leads to these advisories:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Bonnie have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Bonnie, IL
- Average high temperature in December: 43.2°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in December
Bonnie, 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
Bonnie, IL
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in December
Bonnie, IL
- Average humidity in December: 78%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Bonnie, IL
- Average rainfall in December: 2.01"
The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in December
Bonnie, IL
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in December
Bonnie, IL
- Average snowfall in December: 1.06"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Bonnie, IL
- Average snowfall days in December: 2.9 days
The month with the highest number of snowfall days is January (4.8 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
Bonnie, IL
- Average daylight in December: 9h and 4min
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 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Bonnie, IL
- Average sunshine days in December: 19.9 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in December
Bonnie, 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, November and December (UV index 2).
Average cloud cover in December
Bonnie, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in December
Bonnie, 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).
Bonnie, Illinois, USA
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