December weather forecastMaryville, IL
December
Weather in December
December, the first month of the winter in Maryville, is also a wintry month, with an average temperature varying between 41.9°F (5.5°C) and 30°F (-1.1°C).Temperature
December comes with a decrease in the average high-temperature, falling from a cool 52.9°F (11.6°C) in November to a cold 41.9°F (5.5°C). Maryville records an average nighttime low of 30°F (-1.1°C) in December.Humidity
In Maryville, Illinois, the average relative humidity in December is 77%.Rainfall
In Maryville, during December, the rain falls for 8.4 days and regularly aggregates up to 2.2" (56mm) of precipitation. In Maryville, during the entire year, the rain falls for 149.9 days and collects up to 33.94" (862mm) of precipitation.Snowfall
Months with snowfall are January through March, September, November and December. In Maryville, during December, snow falls for 3.8 days and regularly aggregates up to 1.73" (44mm) of snow. In Maryville, Illinois, during the entire year, snow falls for 20.7 days and aggregates up to 7.13" (181mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 6:59 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:48 pm CST.
Sunshine
In Maryville, the average sunshine in December is 4.8h.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 low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Maryville, IL
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Maryville, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Maryville, IL
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).
Average humidity in December
Maryville, IL
- Average humidity in December: 77%
The months with the highest relative humidity are May, July and August (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Maryville, IL
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is February (1.77").
Average rainfall days in December
Maryville, IL
- Average rainfall days in December: 8.4 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Maryville, IL
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in December
Maryville, IL
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Maryville, IL
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Maryville, IL
- Average sunshine days in December: 18.6 days
The month with the most sunshine days is December (18.6 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in December
Maryville, IL
- Average UV index in December: 2
The months with the highest UV index are May, 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
Maryville, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in December
Maryville, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
