December weather forecastOregon, IL
December
Weather in December
The first month of the winter, December, is also an icy month in Oregon, Illinois, with an average temperature varying between 22.5°F (-5.3°C) and 32.7°F (0.4°C).Temperature
The onset of December coincides with a reduction in the average high-temperature, falling from a chilly 45.1°F (7.3°C) in November to a wintry 32.7°F (0.4°C). December witnesses an average low-temperature hovering around a subzero cold 22.5°F (-5.3°C).Humidity
The average relative humidity in December is 83%.Rainfall
In December, in Oregon, the rain falls for 7.5 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. In Oregon, during the entire year, the rain falls for 141.2 days and collects up to 20.31" (516mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Oregon, during December, snow falls for 9.8 days and regularly aggregates up to 1.69" (43mm) of snow. Throughout the year, there are 44.6 snowfall days, and 9.49" (241mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:36 pm CST.
Sunshine
In December, the average sunshine is 3.8h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 1 in December translates into the following instructions:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Oregon, IL
- Average high temperature in December: 32.7°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.8°F).
- Average low temperature in December: 22.5°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).
Average pressure in December
Oregon, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Oregon, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Oregon, IL
- Average humidity in December: 83%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Oregon, IL
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is June (2.91").
The driest months (with the least rainfall) are January and February (0.94").
Average rainfall days in December
Oregon, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Oregon, IL
- Average snowfall in December: 1.69"
The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Oregon, IL
- Average snowfall days in December: 9.8 days
The month with the highest number of snowfall days is January (12.2 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
Oregon, IL
- Average daylight in December: 9h and 12min
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 12min).
- Average sunshine in December: 3h and 48min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Oregon, IL
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in December
Oregon, IL
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Oregon, IL
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in December
Oregon, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
