December weather forecastTwin Brooks, SD
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Twin Brooks, South Dakota, with an average temperature fluctuating between 24.6°F (-4.1°C) and 13.1°F (-10.5°C).Temperature
The onset of December brings a distinct decrease in the average high-temperature, receding from an icy 40.6°F (4.8°C) in November to a freezing cold 24.6°F (-4.1°C). Throughout the month of December, the nighttime temperature in Twin Brooks dips to an average of 13.1°F (-10.5°C).Humidity
The average relative humidity in December in Twin Brooks is 85%.Rainfall
In December, the rain falls for 4.2 days. Throughout December, 1.1" (28mm) of precipitation is accumulated. In Twin Brooks, during the entire year, the rain falls for 115.2 days and collects up to 19.88" (505mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Twin Brooks. The month with the most snowfall is December, when snow falls for 12.7 days and typically aggregates up to 4.49" (114mm) of snow.Daylight
December has the shortest days of the year in Twin Brooks, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:46 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 4:54 pm CST.
Sunshine
The average sunshine in December in Twin Brooks is 4.2h.UV index
The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: An average maximum UV index of 2 in December leads to these recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Twin Brooks, SD
- Average high temperature in December: 24.6°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (19.6°F).
- Average low temperature in December: 13.1°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (6.1°F).
Average pressure in December
Twin Brooks, SD
- Average pressure in December: 30.12"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in December
Twin Brooks, SD
- Average wind speed in December: 10.4mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in December
Twin Brooks, SD
- Average humidity in December: 85%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (66%).
Average rainfall in December
Twin Brooks, SD
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is June (3.11").
The driest months (with the least rainfall) are January and February (0.63").
Average rainfall days in December
Twin Brooks, SD
- Average rainfall days in December: 4.2 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in December
Twin Brooks, SD
- Average snowfall in December: 4.49"
The month with the highest snowfall is December (4.49").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Twin Brooks, SD
- Average snowfall days in December: 12.7 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Twin Brooks, SD
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 4h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Twin Brooks, SD
- Average sunshine days in December: 16.3 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in December
Twin Brooks, SD
- 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 January (UV index 1).
Average cloud cover in December
Twin Brooks, SD
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 25).
Average visibility in December
Twin Brooks, SD
- 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).
