December weather forecastNaples, IL
December
Weather in December
The first month of the winter, December, is still a cold month in Naples, Illinois, with an average temperature varying between 27.9°F (-2.3°C) and 39.2°F (4°C).Temperature
As November transitions to December, the average high-temperature falls from a fresh 51.1°F (10.6°C) to a wintry 39.2°F (4°C). In Naples, the December nights cool down to an average low of 27.9°F (-2.3°C).Humidity
In Naples, Illinois, the average relative humidity in December is 77%.Rainfall
The months with the least rainfall are January, February and December Rain falls for 8.1 days and accumulates 1.73" (44mm) of rain.Snowfall
January through April, October through December are months with snowfall in Naples. In Naples, in December, during 5.9 snowfall days, 1.54" (39mm) of snow is typically accumulated. In Naples, during the entire year, snow falls for 30.2 days and aggregates up to 10.75" (273mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:05 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:48 pm CST.
Sunshine
The average sunshine in December is 4.8h.UV index
The months with the lowest UV index in Naples are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Naples, IL
- Average high temperature in December: 39.2°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in December: 27.9°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 (21.6°F).
Average pressure in December
Naples, 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 (29.91"Hg).
Average wind speed in December
Naples, IL
- Average wind speed in December: 9.4mph
The windiest months (with the highest average wind speed) are January and April (9.9mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in December
Naples, IL
- Average humidity in December: 77%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Naples, IL
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January, February and December (1.73").
Average rainfall days in December
Naples, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in December
Naples, IL
- Average snowfall in December: 1.54"
The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Naples, IL
- Average snowfall days in December: 5.9 days
The month with the highest number of snowfall days is January (9.8 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
Naples, IL
- Average daylight in December: 9h and 24min
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 48min
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 18min).
Average sunshine days in December
Naples, IL
- Average sunshine days in December: 17.9 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (8.6 days).
Average UV index in December
Naples, 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
Naples, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 30).
Average visibility in December
Naples, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
