December weather forecastFlanagan, IL
December
Weather in December
December, the first month of the winter in Flanagan, is still a cold month, with an average temperature varying between 36.5°F (2.5°C) and 25.9°F (-3.4°C).Temperature
December brings a decrease in the average high-temperature, shifting from a chilly 47.5°F (8.6°C) in November to an icy 36.5°F (2.5°C). During December in Flanagan, Illinois, the average low-temperature is recorded at a subzero cold 25.9°F (-3.4°C).Humidity
In Flanagan, Illinois, the average relative humidity in December is 81%.Rainfall
In Flanagan, during December, the rain falls for 6.2 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Flanagan, Illinois, during the entire year, the rain falls for 125.3 days and collects up to 15.71" (399mm) of precipitation.Snowfall
Months with snowfall in Flanagan are January through April, October through December. In December, it is snowing for 6.3 days. Throughout December, 0.94" (24mm) of snow is accumulated. In Flanagan, during the entire year, snow falls for 30.6 days and aggregates up to 6.93" (176mm) of snow.Daylight
The month with the shortest days in Flanagan is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:01 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:37 pm CST.
Sunshine
The average sunshine in December in Flanagan is 4.3h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: An average UV index of 1 in December transforms into this advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. 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
Flanagan, IL
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in December
Flanagan, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Flanagan, IL
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Flanagan, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Flanagan, IL
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is May (2.44").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days in December
Flanagan, IL
- Average rainfall days in December: 6.2 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in December
Flanagan, IL
- Average snowfall in December: 0.94"
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
Flanagan, IL
- Average snowfall days in December: 6.3 days
The month with the highest number of snowfall days is January (10.2 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
Flanagan, IL
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 18min
The months with the most sunshine are June and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Flanagan, IL
- Average sunshine days in December: 19.3 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in December
Flanagan, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Flanagan, IL
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in December
Flanagan, 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).
