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's arrival coincides with a drop in the average high-temperature, decreasing from November's chilly 45°F (7.2°C) to a subzero cold 30.7°F (-0.7°C). In December, Rockwell City's temperature tends to fall to an average low of 19.6°F (-6.9°C) during the night.Humidity
The average relative humidity in December in Rockwell City is 81%.Rainfall
In Rockwell City, Iowa, during December, the rain falls for 4.5 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, in Rockwell City, there are 128 rainfall days, and 26.18" (665mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Rockwell City, in December, during 8.5 snowfall days, 2.52" (64mm) of snow is typically accumulated. In Rockwell City, Iowa, during the entire year, snow falls for 39.2 days and aggregates up to 17.64" (448mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:28 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 4:56 pm CST.
Sunshine
In Rockwell City, the average sunshine in December is 4.7h.UV index
In Rockwell City, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 2 during December leads to these instructions:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. 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
How cold is it in Rockwell City in December?
What is the average humidity in December in Rockwell City?
How much does it rain in Rockwell City in December?
How much does it snow in Rockwell City in December?
What is the month with the shortest days in Rockwell City?
How many hours of daylight does Rockwell City have in December?
When is the sunrise / sunset in December in Rockwell City?
How long on average sun shines in December in Rockwell City?
What is the UV index intensity in December in Rockwell City?
Average temperature in December
Rockwell City, IA
- Average high temperature in December: 30.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in December: 19.6°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in December
Rockwell City, IA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Rockwell City, IA
- Average wind speed in December: 10.4mph
The windiest months (with the highest average wind speed) are January and April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in December
Rockwell City, IA
- Average humidity in December: 81%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in December
Rockwell City, IA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in December
Rockwell City, IA
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is February (3 days).
Average snowfall in December
Rockwell City, IA
- Average snowfall in December: 2.52"
The month with the highest snowfall is February (5.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rockwell City, IA
- Average snowfall days in December: 8.5 days
The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rockwell City, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Rockwell City, IA
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is June (9.9 days).
Average UV index in December
Rockwell City, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Rockwell City, IA
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in December
Rockwell City, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Rockwell City, Iowa, USA
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