December weather forecastOakley, IL
December
Weather in December
December, the first month of the winter in Oakley, is also a wintry month, with an average temperature fluctuating between 27.9°F (-2.3°C) and 38.3°F (3.5°C).Temperature
The arrival of December corresponds with a shift in temperature, down from a chilly 49.6°F (9.8°C) in November to an icy 38.3°F (3.5°C). An average nighttime temperature of 27.9°F (-2.3°C) is recorded during December.Humidity
In Oakley, the average relative humidity in December is 79%.Rainfall
December is the month with the least rainfall. Rain falls for 8 days and accumulates 1.38" (35mm) of precipitation.Snowfall
Months with snowfall in Oakley are January through April, November and December. In December, in Oakley, Illinois, it is snowing for 6.9 days. Throughout December, 1.42" (36mm) of snow is accumulated. Throughout the year, there are 29.3 snowfall days, and 8.78" (223mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:58 am and sunset at 4:30 pm. On the last day of December, in Oakley, sunrise is at 7:16 am and sunset at 4:40 pm CST.
Sunshine
In Oakley, the average sunshine in December is 4.5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Oakley. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Oakley, IL
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 27.9°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in December
Oakley, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Oakley, IL
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Oakley, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Oakley, IL
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is December (1.38").
Average rainfall days in December
Oakley, IL
- Average rainfall days in December: 8 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (7 days).
Average snowfall in December
Oakley, IL
- Average snowfall in December: 1.42"
The month with the highest snowfall is January (2.72").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Oakley, IL
- Average snowfall days in December: 6.9 days
The month with the highest number of snowfall days is January (9.3 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
Oakley, IL
- Average daylight in December: 9h and 24min
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 30min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Oakley, IL
- Average sunshine days in December: 17.2 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in December
Oakley, 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
Oakley, IL
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in December
Oakley, 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).
