December weather forecastTrivoli, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Trivoli, Illinois, with temperature in the range of an average low of 25.7°F (-3.5°C) and an average high of 36.5°F (2.5°C).Temperature
Trivoli observes a minor decrease in the average high-temperature with the arrival of December, falling from November's frosty 48°F (8.9°C) to an icy 36.5°F (2.5°C). Throughout the month of December, Trivoli sees a steady low-temperature average of 25.7°F (-3.5°C).Humidity
The average relative humidity in December is 80%.Rainfall
February and December are months with the least rain when the rain falls for 8 days and typically aggregates up to 1.42" (36mm) of rain.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 6 days. Throughout December, 1.61" (41mm) of snow is accumulated. Throughout the year, there are 30.9 snowfall days, and 11.3" (287mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:04 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:42 pm CST.
Sunshine
In December, the average sunshine is 4.4h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Trivoli, IL
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (30.4°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in December
Trivoli, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Trivoli, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Trivoli, 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 (72%).
Average rainfall in December
Trivoli, IL
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.42").
Average rainfall days in December
Trivoli, IL
- Average rainfall days in December: 8 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in December
Trivoli, IL
- Average snowfall in December: 1.61"
The month with the highest snowfall is January (3.78").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Trivoli, IL
- Average snowfall days in December: 6 days
The month with the highest number of snowfall days is January (10.6 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
Trivoli, IL
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 4h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Trivoli, IL
- Average sunshine days in December: 17.8 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in December
Trivoli, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Trivoli, IL
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in December
Trivoli, 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).
