December weather forecastOacoma, SD
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Oacoma, South Dakota, with an average temperature fluctuating between 16.9°F (-8.4°C) and 29.1°F (-1.6°C).Temperature
The changeover to December signals a significant decrease in the average high-temperature, dropping from a chilly 45.5°F (7.5°C) in November to a subzero cold 29.1°F (-1.6°C). During the month of December, an average low-temperature of 16.9°F (-8.4°C) is recorded.Humidity
In Oacoma, the average relative humidity in December is 82%.Rainfall
In December, in Oacoma, South Dakota, the rain falls for 3.9 days. Throughout December, 0.94" (24mm) of precipitation is accumulated. Throughout the year, there are 107.6 rainfall days, and 17.83" (453mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Oacoma. In December, in Oacoma, it is snowing for 9.6 days. Throughout December, 3.07" (78mm) of snow is accumulated. Throughout the year, there are 50.9 snowfall days, and 17.87" (454mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of December in Oacoma, sunrise is at 7:52 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 5:10 pm CST.
Sunshine
The average sunshine in December in Oacoma is 4.9h.UV index
The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Oacoma, SD
- Average high temperature in December: 29.1°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 16.9°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in December
Oacoma, SD
- 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 (29.84"Hg).
Average wind speed in December
Oacoma, SD
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is August (9.1mph).
Average humidity in December
Oacoma, SD
- Average humidity in December: 82%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is September (58%).
Average rainfall in December
Oacoma, SD
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is November (0.55").
Average rainfall days in December
Oacoma, SD
- Average rainfall days in December: 3.9 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in December
Oacoma, SD
- Average snowfall in December: 3.07"
The month with the highest snowfall is February (3.66").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Oacoma, SD
- Average snowfall days in December: 9.6 days
The months with the highest number of snowfall days are January and February (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Oacoma, 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 54min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Oacoma, SD
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is April (11.8 days).
Average UV index in December
Oacoma, SD
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Oacoma, SD
- Average cloud cover in December: 47
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in December
Oacoma, 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).
