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
In December, the average high-temperature decreases from a cool 50.4°F (10.2°C) in November to a wintry 39.2°F (4°C). Throughout December, a steady low-temperature average of 28.4°F (-2°C) is noted.Humidity
In Windsor, Illinois, the average relative humidity in December is 79%.Rainfall
In Windsor, Illinois, during December, the rain falls for 5.9 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Windsor, during the entire year, the rain falls for 116.5 days and collects up to 11.54" (293mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 4 days. Throughout December, 0.67" (17mm) of snow is accumulated. In Windsor, during the entire year, snow falls for 19 days and aggregates up to 2.8" (71mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 6:56 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:41 pm CST.
Sunshine
The average sunshine in December is 4.5h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Windsor, IL
- Average high temperature in December: 39.2°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in December: 28.4°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in December
Windsor, IL
- Average pressure in December: 30.13"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
Windsor, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Windsor, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Windsor, IL
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is June (1.46").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in December
Windsor, IL
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in December
Windsor, IL
- Average snowfall in December: 0.67"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Windsor, IL
- Average snowfall days in December: 4 days
The month with the highest number of snowfall days is February (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Windsor, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 3min
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
Windsor, IL
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is December (22.1 days).
The month with the least sunshine days is June (13.5 days).
Average UV index in December
Windsor, 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
Windsor, IL
- Average cloud cover in December: 53
The months with the most cloud cover are January and February (Cloud cover 55).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility in December
Windsor, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Windsor, Illinois, USA
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