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
Frederick's transition into December involves a shift in temperature, receding from a cool 50.4°F (10.2°C) in November to a cold 38.7°F (3.7°C). December brings Frederick a consistent average low-temperature of 27.5°F (-2.5°C).Humidity
In Frederick, Illinois, the average relative humidity in December is 78%.Rainfall
December is the month with the least rainfall. Rain falls for 8.6 days and accumulates 1.61" (41mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Frederick, Illinois, in December, during 6.3 snowfall days, 1.65" (42mm) of snow is typically accumulated. Throughout the year, there are 31.2 snowfall days, and 11.85" (301mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:36 pm. On the last day of December, in Frederick, sunrise is at 7:23 am and sunset at 4:46 pm CST.
Sunshine
In December, the average sunshine in Frederick is 4.7h.UV index
The months with the lowest UV index in Frederick are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. 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
How cold is it in Frederick in December?
What is the average humidity in December in Frederick?
What is the driest month in Frederick?
How many days does it rain in December in Frederick?
How many days does it snow in December in Frederick?
What is the month with the shortest days in Frederick?
What is the average length of the day in December in Frederick?
What time are sunrise and sunset in December in Frederick?
How long on average sun shines in December in Frederick?
When is the lowest UV index in Frederick?
What is the UV index intensity in December in Frederick?
Average temperature in December
Frederick, IL
- Average high temperature in December: 38.7°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 (32.7°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in December
Frederick, 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
Frederick, IL
- Average wind speed in December: 9.6mph
The windiest months (with the highest average wind speed) are January, February and April (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Frederick, 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
Frederick, IL
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is May (3.62").
The driest month (with the least rainfall) is December (1.61").
Average rainfall days in December
Frederick, IL
- Average rainfall days in December: 8.6 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in December
Frederick, IL
- Average snowfall in December: 1.65"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Frederick, IL
- Average snowfall days in December: 6.3 days
The month with the highest number of snowfall days is January (10.1 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
Frederick, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Frederick, IL
- Average sunshine days in December: 17.2 days
The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in December
Frederick, 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
Frederick, IL
- Average cloud cover in December: 50
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 30).
Average visibility in December
Frederick, 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).
Frederick, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location