December weather forecastAllerton, IL
December
Weather in December
December, the first month of the winter in Allerton, is still a cold month, with temperature in the range of an average low of 28°F (-2.2°C) and an average high of 38.5°F (3.6°C).Temperature
Allerton's weather in December involves a decrease in the average high-temperature, moving down from November's frosty 49.6°F (9.8°C) to an icy 38.5°F (3.6°C). During the month of December, the temperature falls to an average of 28°F (-2.2°C).Humidity
The average relative humidity in December is 80%.Rainfall
In Allerton, in December, during 7.7 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. In Allerton, during the entire year, the rain falls for 132 days and collects up to 15.94" (405mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. The month with the most snowfall is December, when snow falls for 5.7 days and typically aggregates up to 1.26" (32mm) of snow.Daylight
The month with the shortest days in Allerton is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 6:54 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:36 pm CST.
Sunshine
In December, the average sunshine is 4.6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Allerton. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 2 in December translates into this advice:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Allerton, IL
- Average high temperature in December: 38.5°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in December: 28°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in December
Allerton, 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 (29.93"Hg).
Average wind speed in December
Allerton, IL
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Allerton, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Allerton, IL
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is April (1.97").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in December
Allerton, IL
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is February (6 days).
Average snowfall in December
Allerton, IL
- Average snowfall in December: 1.26"
The month with the highest snowfall is December (1.26").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Allerton, IL
- Average snowfall days in December: 5.7 days
The month with the highest number of snowfall days is January (8 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
Allerton, IL
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 36min
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 6min).
Average sunshine days in December
Allerton, IL
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is July (11.1 days).
Average UV index in December
Allerton, 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
Allerton, IL
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in December
Allerton, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
