December weather forecastGarretson, SD
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Garretson, South Dakota, with temperature in the range of an average high of 27.3°F (-2.6°C) and an average low of 15.3°F (-9.3°C).Temperature
December's onset brings a clear reduction in the average high-temperature, falling from a chilly 43°F (6.1°C) in November to a freezing cold 27.3°F (-2.6°C). During December, the nighttime temperature averages of 15.3°F (-9.3°C).Humidity
In December, the average relative humidity in Garretson is 84%.Rainfall
In December, in Garretson, the rain falls for 3.4 days. Throughout December, 0.91" (23mm) of precipitation is accumulated. In Garretson, during the entire year, the rain falls for 112.2 days and collects up to 20.67" (525mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Garretson, South Dakota. In Garretson, in December, snow falls for 10 days, with typically accumulated 2.91" (74mm) of snow. In Garretson, during the entire year, snow falls for 42.1 days and aggregates up to 18.94" (481mm) of snow.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year in Garretson.On the first day of December in Garretson, South Dakota, sunrise is at 7:40 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 4:59 pm CST.
Sunshine
In December, the average sunshine is 4.3h.UV index
The months with the lowest UV index in Garretson are January, February, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. 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
Garretson, SD
- Average high temperature in December: 27.3°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (22.8°F).
- Average low temperature in December: 15.3°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in December
Garretson, SD
- Average pressure in December: 30.13"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
Garretson, SD
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in December
Garretson, SD
- Average humidity in December: 84%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (67%).
Average rainfall in December
Garretson, SD
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days in December
Garretson, SD
- Average rainfall days in December: 3.4 days
The month with the highest number of rainy days is June (17.4 days).
The month with the least rainy days is February (2.2 days).
Average snowfall in December
Garretson, SD
- Average snowfall in December: 2.91"
The month with the highest snowfall is February (4.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Garretson, SD
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is December (10 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Garretson, SD
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 4h and 18min
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 0min).
Average sunshine days in December
Garretson, SD
- Average sunshine days in December: 19.3 days
The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in December
Garretson, SD
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in December
Garretson, SD
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Garretson, SD
- 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).
