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
December ushers in a slight temperature change, with average high-temperatures reducing from November's cool 54°F (12.2°C) to a chilly 43.9°F (6.6°C). An average low-temperature of 31.3°F (-0.4°C) marks the nights throughout December.Humidity
In Rockwood, the average relative humidity in December is 77%.Rainfall
In Rockwood, in December, during 6.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In Rockwood, during the entire year, the rain falls for 111.9 days and collects up to 10.43" (265mm) of precipitation.Snowfall
Months with snowfall in Rockwood are January through March, October through December. In Rockwood, during December, snow falls for 1.8 days and regularly aggregates up to 0.2" (5mm) of snow. Throughout the year, in Rockwood, Illinois, there are 10.9 snowfall days, and 1.42" (36mm) of snow is accumulated.Daylight
December has the shortest days of the year in Rockwood, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 6:56 am and sunset at 4:40 pm. On the last day of December, in Rockwood, sunrise is at 7:14 am and sunset at 4:50 pm CST.
Sunshine
In Rockwood, the average sunshine in December is 5h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Rockwood. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Frequently asked questions
Is December cold in Rockwood?
What is the average humidity in December in Rockwood?
How much does it rain in Rockwood in December?
How much does it snow in Rockwood in December?
What is the month with the shortest days in Rockwood?
How many hours of daylight does Rockwood have in December?
When are sunrise and sunset in December in Rockwood?
How long on average sun shines in December in Rockwood?
When is the lowest UV index in Rockwood?
What is the UV index intensity in December in Rockwood?
Average temperature in December
Rockwood, IL
- Average high temperature in December: 43.9°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (39.4°F).
- Average low temperature in December: 31.3°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in December
Rockwood, IL
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rockwood, IL
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Rockwood, IL
- Average humidity in December: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Rockwood, IL
- Average rainfall in December: 0.63"
The wettest months (with the highest rainfall) are April and May (1.22").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in December
Rockwood, IL
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is July (13.4 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in December
Rockwood, IL
- Average snowfall in December: 0.2"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in December
Rockwood, IL
- Average snowfall days in December: 1.8 days
The month with the highest number of snowfall days is January (3.7 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
Rockwood, IL
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 48min).
Average sunshine days in December
Rockwood, IL
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is October (21.9 days).
The month with the least sunshine days is July (13.5 days).
Average UV index in December
Rockwood, 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 and December (UV index 2).
Average cloud cover in December
Rockwood, IL
- Average cloud cover in December: 47
The months with the most cloud cover are January and February (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in December
Rockwood, 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).
Rockwood, Illinois, USA
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