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
East Alton's weather changes with the onset of December, slightly falling from a cool 52.2°F (11.2°C) in November to a cold 41.4°F (5.2°C). East Alton observes an average nighttime temperature of 29.8°F (-1.2°C) during December.Humidity
In East Alton, the average relative humidity in December is 77%.Rainfall
In East Alton, during December, the rain falls for 6.7 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, in East Alton, Illinois, there are 138 rainfall days, and 23.9" (607mm) of precipitation is accumulated.Snowfall
Months with snowfall in East Alton are January through April, November and December. In East Alton, during December, snow falls for 3.8 days and regularly aggregates up to 0.91" (23mm) of snow. Throughout the year, there are 18.6 snowfall days, and 4.53" (115mm) of snow is accumulated.Daylight
December has the shortest days of the year in East Alton, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:48 pm CST.
Sunshine
In East Alton, the average sunshine in December is 4.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in East Alton. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
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. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold in East Alton during December?
What is the average humidity in December in East Alton?
How many days does it rain in December in East Alton?
How much does it snow in East Alton in December?
What is the month with the shortest days in East Alton?
How many hours of daylight does East Alton have in December?
What time are sunrise and sunset in December in East Alton?
How long on average sun shines in December in East Alton?
What is the month with the lowest UV index in East Alton?
What is the UV index reading in December in East Alton?
Average temperature in December
East Alton, IL
- Average high temperature in December: 41.4°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
East Alton, 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 Alton, IL
- Average wind speed in December: 9mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity in December
East Alton, IL
- Average humidity in December: 77%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
East Alton, IL
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is February (1.14").
Average rainfall days in December
East Alton, IL
- Average rainfall days in December: 6.7 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (5.6 days).
Average snowfall in December
East Alton, IL
- Average snowfall in December: 0.91"
The month with the highest snowfall is February (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
East Alton, IL
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is January (6 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 Alton, 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 month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).
Average sunshine days in December
East Alton, IL
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is July (12.3 days).
Average UV index in December
East Alton, 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, November and December (UV index 2).
Average cloud cover in December
East Alton, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June, July and August (Cloud cover 29).
Average visibility in December
East Alton, 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 Alton, Illinois, USA
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