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 the onset of December, Chester experiences a modest temperature adjustment, with the average high-temperature receding from a cool 53.8°F (12.1°C) in November to a chilly 43.7°F (6.5°C). December witnesses an average nighttime temperature of 31.1°F (-0.5°C) in Chester.Humidity
The average relative humidity in December is 77%.Rainfall
In December, in Chester, the rain falls for 9.1 days. Throughout December, 2.4" (61mm) of precipitation is accumulated. Throughout the year, in Chester, Illinois, there are 156.4 rainfall days, and 34.25" (870mm) of precipitation is accumulated.Snowfall
Months with snowfall in Chester are January through April, October through December. In December, it is snowing for 3 days. Throughout December, 1.18" (30mm) of snow is accumulated. Throughout the year, there are 16 snowfall days, and 6.89" (175mm) 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 the month, sunrise is at 6:56 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:50 pm CST.
Sunshine
In December, the average sunshine is 5h.UV index
The months with the lowest UV index in Chester are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
How cold is it in Chester in December?
What is the average humidity in December in Chester?
How many days does it rain in December in Chester?
How many days does it snow in December in Chester?
What is the month with the shortest days in Chester?
How many hours of daylight does Chester have in December?
When is the sunrise / sunset in December in Chester?
How many hours of sunshine does Chester have in December?
What are the months with the lowest UV index in Chester?
How high is the UV index in December in Chester?
Average temperature in December
Chester, IL
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
Chester, 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
Chester, IL
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in December
Chester, 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
Chester, IL
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is April (4.13").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in December
Chester, IL
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in December
Chester, IL
- Average snowfall in December: 1.18"
The month with the highest snowfall is February (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Chester, IL
- Average snowfall days in December: 3 days
The month with the highest number of snowfall days is February (5.2 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
Chester, 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: 5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Chester, IL
- Average sunshine days in December: 18.7 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in December
Chester, 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, February and December (UV index 2).
Average cloud cover in December
Chester, IL
- Average cloud cover in December: 47
The months with the most cloud cover are January and February (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in December
Chester, 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).
Chester, Illinois, USA
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