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
The onset of December entails a temperature shift, as the average high-temperature decreases from a cool 53.2°F (11.8°C) in November to a frosty 42.8°F (6°C). Throughout December nights, East Saint Louis experiences a consistent temperature average of 30.2°F (-1°C).Humidity
In December, the average relative humidity is 76%.Rainfall
In East Saint Louis, in December, during 8.2 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. In East Saint Louis, during the entire year, the rain falls for 154.5 days and collects up to 35.51" (902mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In East Saint Louis, in December, snow falls for 4.2 days, with typically accumulated 2.05" (52mm) of snow. In East Saint Louis, during the entire year, snow falls for 21.9 days and aggregates up to 7.91" (201mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:49 pm CST.
Sunshine
In East Saint Louis, the average sunshine in December is 4.9h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Boost your sun resistance with garments that are densely woven yet spacious. 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
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index in East Saint Louis?
What is the UV index reading in December?
Average temperature in December
East Saint Louis, IL
- Average high temperature in December: 42.8°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in December: 30.2°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 (24.4°F).
Average pressure in December
East Saint Louis, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
East Saint Louis, IL
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).
Average humidity in December
East Saint Louis, IL
- Average humidity in December: 76%
The months with the highest relative humidity are May and July (78%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
East Saint Louis, IL
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is February (1.89").
Average rainfall days in December
East Saint Louis, IL
- Average rainfall days in December: 8.2 days
The months with the highest number of rainy days are May and July (17.5 days).
The month with the least rainy days is January (8 days).
Average snowfall in December
East Saint Louis, IL
- Average snowfall in December: 2.05"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
East Saint Louis, IL
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (7.3 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
East Saint Louis, IL
- Average daylight in December: 9h and 3min
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 30min).
- Average sunshine in December: 4h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
East Saint Louis, IL
- Average sunshine days in December: 18.8 days
The month with the most sunshine days is December (18.8 days).
The month with the least sunshine days is May (11.2 days).
Average UV index in December
East Saint Louis, 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
East Saint Louis, IL
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
East Saint Louis, 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).
East Saint Louis, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location