December weather forecastOswego, IL
December
Weather in December
The first month of the winter, December, is also an icy month in Oswego, Illinois, with an average temperature varying between 24.1°F (-4.4°C) and 34.5°F (1.4°C).Temperature
The beginning of December involves a decrease in the average high-temperature, transitioning from a frosty 46°F (7.8°C) in November to an icy 34.5°F (1.4°C). In December, Oswego experiences a temperature dip to an average of 24.1°F (-4.4°C) at night.Humidity
The average relative humidity in December in Oswego is 82%.Rainfall
The months with the least rainfall are November and December Rain falls for 6.5 days and accumulates 0.75" (19mm) of rain.Snowfall
January through April, October through December are months with snowfall. In December, in Oswego, it is snowing for 8.8 days. Throughout December, 1.02" (26mm) of snow is accumulated. In Oswego, during the entire year, snow falls for 39.5 days and aggregates up to 6.69" (170mm) of snow.Daylight
December has the shortest days of the year in Oswego, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 4:23 pm. On the last day of December, in Oswego, Illinois, sunrise is at 7:20 am and sunset at 4:33 pm CST.
Sunshine
In Oswego, Illinois, the average sunshine in December is 4.2h.UV index
The months with the lowest UV index in Oswego are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 1 during December translates 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 best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Oswego, IL
- Average high temperature in December: 34.5°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in December: 24.1°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in December
Oswego, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Oswego, IL
- Average wind speed in December: 9mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Oswego, IL
- Average humidity in December: 82%
The months with the highest relative humidity are January, February, July and August (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Oswego, IL
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is June (2.24").
The driest months (with the least rainfall) are November and December (0.75").
Average rainfall days in December
Oswego, IL
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in December
Oswego, IL
- Average snowfall in December: 1.02"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Oswego, IL
- Average snowfall days in December: 8.8 days
The month with the highest number of snowfall days is January (10.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Oswego, 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: 4h and 12min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Oswego, IL
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (10.2 days).
Average UV index in December
Oswego, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Oswego, IL
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in December
Oswego, 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).
