December weather forecastAtwater, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Atwater, Illinois, with an average temperature ranging between min 28.6°F (-1.9°C) and max 39.7°F (4.3°C).Temperature
Start of December brings a shift in the average high-temperature, falling from November's cool 50.9°F (10.5°C) to a wintry 39.7°F (4.3°C). December brings with it a nighttime average temperature of 28.6°F (-1.9°C).Humidity
In December, the average relative humidity 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
January through April, November and December are months with snowfall. In Atwater, during December, snow falls for 4.9 days and regularly aggregates up to 1.69" (43mm) of snow. In Atwater, during the entire year, snow falls for 25.5 days and aggregates up to 9.09" (231mm) 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 7:00 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:45 pm CST.
Sunshine
In December, the average sunshine 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 value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Atwater, 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
Atwater, 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
Atwater, 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
Atwater, 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
Atwater, 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
Atwater, 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
Atwater, 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
Atwater, 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
Atwater, IL
- Average daylight in December: 9h and 30min
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 30min).
- 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 24min).
Average sunshine days in December
Atwater, 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
Atwater, 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
Atwater, 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
Atwater, 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).
