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
A moderate decline in the average high-temperature is seen during December, decreasing from a chilly 45.1°F (7.3°C) in November to an icy 34°F (1.1°C). During the nights of December, Old Mill Creek records an average temperature of 25.3°F (-3.7°C), a minor drop from daytime peaks.Humidity
In December, the average relative humidity is 81%.Rainfall
The month with the least rainfall is December, when the rain falls for 8.1 days and typically collects 0.91" (23mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Old Mill Creek, Illinois. In Old Mill Creek, in December, during 9.7 snowfall days, 1.77" (45mm) of snow is typically accumulated. Throughout the year, there are 45.5 snowfall days, and 9.37" (238mm) of snow is accumulated.Daylight
December has the shortest days of the year in Old Mill Creek, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:02 am and sunset at 4:20 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:29 pm CST.
Sunshine
In Old Mill Creek, the average sunshine in December is 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 health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
How cold is it in Old Mill Creek in December?
What is the average humidity in December in Old Mill Creek?
What is the driest month in Old Mill Creek?
How many days does it rain in December in Old Mill Creek?
How much does it snow in Old Mill Creek in December?
What is the month with the shortest days in Old Mill Creek?
How many hours of daylight does Old Mill Creek have in December?
What time are sunrise and sunset in December in Old Mill Creek?
How many hours of sunshine does Old Mill Creek have in December?
What is the month with the lowest UV index in Old Mill Creek?
How high is the UV index in December in Old Mill Creek?
Average temperature in December
Old Mill Creek, IL
- Average high temperature in December: 34°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 25.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in December
Old Mill Creek, IL
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Old Mill Creek, IL
- Average wind speed in December: 11.1mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in December
Old Mill Creek, IL
- Average humidity in December: 81%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in December
Old Mill Creek, IL
- Average rainfall in December: 0.91"
The wettest months (with the highest rainfall) are June and August (2.68").
The driest month (with the least rainfall) is December (0.91").
Average rainfall days in December
Old Mill Creek, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in December
Old Mill Creek, IL
- Average snowfall in December: 1.77"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Old Mill Creek, IL
- Average snowfall days in December: 9.7 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Old Mill Creek, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Old Mill Creek, IL
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in December
Old Mill Creek, IL
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Old Mill Creek, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Old 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).
Old Mill Creek, Illinois, USA
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