December weather forecastNormal, IL
December
Weather in December
December in Normal signals the full swing of winter, as evidenced by plummeting temperatures and increased snowfall of 1.65" (42mm). This period is characterized by shorter days and longer nights, typical of the winter months. December's lower temperature, along with increased snowfall, makes way for a host of winter recreational opportunities. The combination of cool, snowy weather and festive season gives December a unique allure, rounding off the year perfectly for residents of Normal.Temperature
December comes with a drop in the average high-temperature, falling from November's frosty 47.7°F (8.7°C) to a cold 36.5°F (2.5°C). Normal observes an average nighttime temperature of 26.2°F (-3.2°C) during December.Humidity
In December, the average relative humidity is 80%.Rainfall
In Normal, in December, it is raining for 7.1 days, with typically 1.22" (31mm) of accumulated precipitation. In Normal, during the entire year, the rain falls for 140.6 days and collects up to 22.44" (570mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Normal. In Normal, in December, during 8 snowfall days, 1.65" (42mm) of snow is typically accumulated. Throughout the year, there are 35.4 snowfall days, and 9.45" (240mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:00 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:39 pm CST.
Sunshine
The average sunshine in December is 4.1h.UV index
The months with the lowest UV index in Normal are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, a daily UV index of 2 turns into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Enhance your sun protection with tightly woven, yet airy clothing. Consider carefully! The reflective quality of snow 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
Average temperature in December
Normal, IL
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in December: 26.2°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 (18.9°F).
Average pressure in December
Normal, 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 (29.92"Hg).
Average wind speed in December
Normal, IL
- Average wind speed in December: 10.5mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Normal, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Normal, IL
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in December
Normal, IL
- Average rainfall days in December: 7.1 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Normal, IL
- Average snowfall in December: 1.65"
The month with the highest snowfall is January (2.44").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Normal, IL
- Average snowfall days in December: 8 days
The month with the highest number of snowfall days is January (11.5 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
Normal, 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 6min
The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Normal, IL
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in December
Normal, 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
Normal, IL
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in December
Normal, 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).
