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
The beginning of December signals a clear reduction in the average high-temperature, falling from a chilly 47.5°F (8.6°C) in November to a cold 32.9°F (0.5°C). Throughout December in River Sioux, a steady low-temperature average of 21°F (-6.1°C) is noted.Humidity
In River Sioux, the average relative humidity in December is 79%.Rainfall
In December, in River Sioux, the rain falls for 4.6 days. Throughout December, 1.42" (36mm) of precipitation is accumulated. Throughout the year, there are 125.1 rainfall days, and 22.64" (575mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In River Sioux, during December, snow falls for 6.8 days and regularly aggregates up to 2.17" (55mm) of snow. In River Sioux, during the entire year, snow falls for 32.8 days and aggregates up to 11.97" (304mm) of snow.Daylight
December has the shortest days of the year in River Sioux, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:32 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:51 am and sunset at 5:03 pm CST.
Sunshine
In December, the average sunshine is 5h.UV index
The months with the lowest UV index in River Sioux 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 health risk 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:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
How cold is it in River Sioux in December?
What is the average humidity in December in River Sioux?
How many days does it rain in December in River Sioux?
How many days does it snow in December in River Sioux?
What is the month with the shortest days in River Sioux?
How many hours of daylight does River Sioux have in December?
What time are sunrise and sunset in December in River Sioux?
How many hours of sunshine does River Sioux have in December?
What are the months with the lowest UV index in River Sioux?
What is the UV index intensity in December in River Sioux?
Average temperature in December
River Sioux, IA
- Average high temperature in December: 32.9°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in December
River Sioux, IA
- 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 (29.86"Hg).
Average wind speed in December
River Sioux, IA
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in December
River Sioux, IA
- Average humidity in December: 79%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (66%).
Average rainfall in December
River Sioux, IA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in December
River Sioux, IA
- Average rainfall days in December: 4.6 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in December
River Sioux, IA
- Average snowfall in December: 2.17"
The month with the highest snowfall is January (2.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
River Sioux, IA
- Average snowfall days in December: 6.8 days
The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
River Sioux, 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 12min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
River Sioux, IA
- Average sunshine days in December: 20.2 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in December
River Sioux, IA
- 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
River Sioux, IA
- Average cloud cover in December: 45
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in December
River Sioux, IA
- 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).
River Sioux, Iowa, USA
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