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, shifting from a cool 51.6°F (10.9°C) in November to an icy 40.1°F (4.5°C). Throughout December, Chesterfield witnesses a nighttime temperature average of 28.8°F (-1.8°C).Humidity
In December, the average relative humidity is 78%.Rainfall
In Chesterfield, Illinois, in December, during 8.1 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Chesterfield, during the entire year, the rain falls for 138.2 days and collects up to 23.31" (592mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 4.7 days. Throughout December, 1.26" (32mm) of snow is accumulated. Throughout the year, in Chesterfield, Illinois, there are 21.2 snowfall days, and 6.65" (169mm) of snow is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:01 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:47 pm CST.
Sunshine
In Chesterfield, the average sunshine in December is 4.8h.UV index
The months with the lowest UV index in Chesterfield are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
How cold does it get in Chesterfield in December?
What is the average humidity in December in Chesterfield?
How many days does it rain in December in Chesterfield?
How many days does it snow in December in Chesterfield?
What is the month with the shortest days in Chesterfield?
How many hours of daylight does Chesterfield have in December?
What time are sunrise and sunset in December in Chesterfield?
How long on average sun shines in December in Chesterfield?
What are the months with the lowest UV index in Chesterfield?
What is the UV index intensity in December in Chesterfield?
Average temperature in December
Chesterfield, IL
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 28.8°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Chesterfield, 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 (29.92"Hg).
Average wind speed in December
Chesterfield, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).
Average humidity in December
Chesterfield, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Chesterfield, IL
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is June (3.07").
The driest months (with the least rainfall) are January and February (1.22").
Average rainfall days in December
Chesterfield, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Chesterfield, IL
- Average snowfall in December: 1.26"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Chesterfield, IL
- Average snowfall days in December: 4.7 days
The month with the highest number of snowfall days is February (6.3 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
Chesterfield, 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 5min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Chesterfield, IL
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.1 days).
Average UV index in December
Chesterfield, 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
Chesterfield, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility in December
Chesterfield, 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).
Chesterfield, Illinois, USA
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