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
Onset of December witnesses a reduction in the average high-temperature, falling from a chilly 47.3°F (8.5°C) in November to a wintry 35.6°F (2°C). Nighttime temperature in Undercliff, Illinois, lowers to an average of 25.3°F (-3.7°C) in December.Humidity
In Undercliff, the average relative humidity in December is 81%.Rainfall
January and December are months with the least rain when the rain falls for 7.5 days and typically aggregates up to 1.57" (40mm) of rain.Snowfall
January through April, October through December are months with snowfall in Undercliff. In Undercliff, in December, during 7 snowfall days, 2.28" (58mm) of snow is typically accumulated. Throughout the year, in Undercliff, there are 36.7 snowfall days, and 14.09" (358mm) of snow is accumulated.Daylight
December has the shortest days of the year, 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 4:29 pm. On the last day of December, in Undercliff, Illinois, sunrise is at 7:22 am and sunset at 4:38 pm CST.
Sunshine
In December, the average sunshine is 4.2h.UV index
In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Tightly woven clothing, when worn loosely, shields effectively against the Sun. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Undercliff?
What is the average humidity in December in Undercliff?
What is the driest month in Undercliff?
How many days does it rain in December in Undercliff?
How much does it snow in Undercliff in December?
What is the month with the shortest days in Undercliff?
How many hours of daylight does Undercliff have in December?
When is the sunrise / sunset in December in Undercliff?
How long on average sun shines in December in Undercliff?
How high is the UV index in December in Undercliff?
Average temperature in December
Undercliff, IL
- Average high temperature in December: 35.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in December: 25.3°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Undercliff, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Undercliff, IL
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Undercliff, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Undercliff, IL
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is May (4.41").
The driest months (with the least rainfall) are January and December (1.57").
Average rainfall days in December
Undercliff, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in December
Undercliff, IL
- Average snowfall in December: 2.28"
The month with the highest snowfall is February (3.7").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Undercliff, IL
- Average snowfall days in December: 7 days
The month with the highest number of snowfall days is January (11.2 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
Undercliff, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Undercliff, IL
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Undercliff, IL
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Undercliff, IL
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Undercliff, IL
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Undercliff, Illinois, USA
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