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 beginning of December marks a decrease in the average high-temperature, transitioning from a chilly 49.1°F (9.5°C) in November to an icy 37.9°F (3.3°C). In the month of December, the temperature generally rests at an average low of 27.5°F (-2.5°C).Humidity
In December, the average relative humidity in Monticello is 79%.Rainfall
The month with the least rainfall is December, when the rain falls for 7.4 days and typically collects 0.91" (23mm) of precipitation.Snowfall
Months with snowfall in Monticello are January through April, November and December. In Monticello, Illinois, during December, snow falls for 4.5 days and regularly aggregates up to 0.79" (20mm) of snow. Throughout the year, there are 23.2 snowfall days, and 5.83" (148mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 6:57 am and sunset at 4:29 pm. On the last day of December, in Monticello, sunrise is at 7:16 am and sunset at 4:39 pm CST.
Sunshine
In December, the average sunshine is 4.4h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Frequently asked questions
Is December cold in Monticello?
What is the average humidity in December in Monticello?
What is the driest month in Monticello?
How much does it rain in Monticello in December?
How much does it snow in Monticello in December?
What is the month with the shortest days in Monticello?
What is the average length of the day in December in Monticello?
When are sunrise and sunset in December in Monticello?
How long on average sun shines in December in Monticello?
What are the months with the lowest UV index in Monticello?
What is the UV index intensity in December in Monticello?
Average temperature in December
Monticello, IL
- Average high temperature in December: 37.9°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (32.4°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Monticello, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Monticello, IL
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Monticello, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Monticello, IL
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.91").
Average rainfall days in December
Monticello, IL
- Average rainfall days in December: 7.4 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in December
Monticello, IL
- Average snowfall in December: 0.79"
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Monticello, IL
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Monticello, IL
- Average daylight in December: 9h and 2min
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 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Monticello, IL
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in December
Monticello, 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
Monticello, IL
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are June, August and September (Cloud cover 32).
Average visibility in December
Monticello, 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).
Monticello, Illinois, USA
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