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
December's arrival corresponds with a decrease in average high-temperatures, from November's fresh 50.9°F (10.5°C) to an icy 39.7°F (4.3°C). The temperature lowers to an average of 28.6°F (-1.9°C) during December nights.Humidity
The average relative humidity in December is 78%.Rainfall
The month with the least rainfall is December, when the rain falls for 8.5 days and typically collects 1.73" (44mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Nilwood, in December, snow falls for 4.9 days, with typically accumulated 1.69" (43mm) of snow. Throughout the year, there are 25.5 snowfall days, and 9.09" (231mm) of snow is accumulated.Daylight
December has the shortest days of the year in Nilwood, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:45 pm CST.
Sunshine
In December, the average sunshine in Nilwood is 4.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the average person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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?
What is the driest month?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Nilwood have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Nilwood, IL
- Average high temperature in December: 39.7°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (34.2°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in December
Nilwood, 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
Nilwood, IL
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in December
Nilwood, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Nilwood, IL
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is June (3.86").
The driest month (with the least rainfall) is December (1.73").
Average rainfall days in December
Nilwood, IL
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in December
Nilwood, IL
- Average snowfall in December: 1.69"
The month with the highest snowfall is February (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Nilwood, IL
- Average snowfall days in December: 4.9 days
The month with the highest number of snowfall days is January (8.5 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
Nilwood, 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 5min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Nilwood, IL
- Average sunshine days in December: 17.9 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (10.6 days).
Average UV index in December
Nilwood, 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
Nilwood, IL
- Average cloud cover in December: 50
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July, August and September (Cloud cover 30).
Average visibility in December
Nilwood, 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).
Nilwood, Illinois, USA
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