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
In December, the average high-temperature decreases from a cool 50.5°F (10.3°C) in November to an icy 39.7°F (4.3°C). The temperature in Trilla lowers to an average of 28.8°F (-1.8°C) during December nights.Humidity
The average relative humidity in December is 79%.Rainfall
In December, in Trilla, Illinois, the rain falls for 7 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. In Trilla, during the entire year, the rain falls for 111.4 days and collects up to 10.31" (262mm) of precipitation.Snowfall
January through March, October through December are months with snowfall in Trilla, Illinois. The month with the most snowfall is December, when snow falls for 3.4 days and typically aggregates up to 0.87" (22mm) of snow.Daylight
December has the shortest days of the year in Trilla, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 6:54 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:40 pm CST.
Sunshine
The average sunshine in December is 4.6h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Trilla. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 1 during December translates into these guidelines:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Trilla in December?
What is the average humidity in December in Trilla?
How many days does it rain in December in Trilla?
What is the snowiest month in Trilla?
How much does it snow in Trilla in December?
What is the month with the shortest days in Trilla?
How many hours of daylight does Trilla have in December?
When are sunrise and sunset in December in Trilla?
How many hours of sunshine does Trilla have in December?
When is the lowest UV index in Trilla?
What is the UV index intensity in December in Trilla?
Average temperature in December
Trilla, IL
- Average high temperature in December: 39.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.5°F).
- Average low temperature in December: 28.8°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Trilla, 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
Trilla, IL
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity in December
Trilla, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Trilla, IL
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is April (1.3").
The driest months (with the least rainfall) are February, September and November (0.51").
Average rainfall days in December
Trilla, IL
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in December
Trilla, IL
- Average snowfall in December: 0.87"
The month with the highest snowfall is December (0.87").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in December
Trilla, IL
- Average snowfall days in December: 3.4 days
The month with the highest number of snowfall days is February (5.3 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
Trilla, IL
- Average daylight in December: 9h and 2min
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 24min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Trilla, IL
- Average sunshine days in December: 21.3 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in December
Trilla, IL
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Trilla, IL
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in December
Trilla, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Trilla, Illinois, USA
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