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
December's onset brings a slight change in high-temperatures, falling from a fresh 54.5°F (12.5°C) in November to a frosty 44.8°F (7.1°C). The month of December records an average low-temperature of 32.2°F (0.1°C) in Mill Creek.Humidity
In Mill Creek, Illinois, the average relative humidity in December is 78%.Rainfall
In Mill Creek, Illinois, in December, during 9.2 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. Throughout the year, there are 143 rainfall days, and 27.44" (697mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In December, in Mill Creek, it is snowing for 2.6 days. Throughout December, 1.1" (28mm) of snow is accumulated. In Mill Creek, during the entire year, snow falls for 14.9 days and aggregates up to 6.06" (154mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 6:53 am and sunset at 4:39 pm. On the last day of December, in Mill Creek, sunrise is at 7:11 am and sunset at 4:49 pm CST.
Sunshine
In Mill Creek, the average sunshine in December is 4.8h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Mill Creek. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average UV index of 2 in December transforms into this advice:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures in Mill Creek?
What is the average humidity in December in Mill Creek?
How many days does it rain in December in Mill Creek?
How many days does it snow in December in Mill Creek?
What is the month with the shortest days in Mill Creek?
What is the average length of the day in December in Mill Creek?
When are sunrise and sunset in December in Mill Creek?
How long on average sun shines in December in Mill Creek?
What is the month with the lowest UV index in Mill Creek?
How high is the UV index in December in Mill Creek?
Average temperature in December
Mill Creek, IL
- Average high temperature in December: 44.8°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in December: 32.2°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in December
Mill Creek, IL
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Mill Creek, IL
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is January (9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in December
Mill Creek, IL
- Average humidity in December: 78%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Mill Creek, IL
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days in December
Mill Creek, IL
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in December
Mill Creek, IL
- Average snowfall in December: 1.1"
The month with the highest snowfall is February (1.89").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Mill Creek, IL
- Average snowfall days in December: 2.6 days
The month with the highest number of snowfall days is January (4.6 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
Mill Creek, IL
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in December
Mill Creek, IL
- Average sunshine days in December: 19.6 days
The month with the most sunshine days is October (21 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in December
Mill Creek, IL
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Mill Creek, IL
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).
Average visibility in December
Mill Creek, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Mill Creek, Illinois, USA
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