December weather forecastVermillion, SD
December
Weather in December
December brings the return of winter to Vermillion, and with it, the return of colder temperatures and snow-laden sceneries. The winter solstice arrives mid-month, marking the shortest daylight hour of the year. The city becomes a canvas for new snowfalls, introducing a period of minimal rainfall and an increase in ice and frost. The wind also picks up, adding a bitter chill to the already cold environment. As Vermillion moves through December, preparations for enduring the brunt of winter become the primary agenda for residents.Temperature
December is marked by a distinct decrease in the average high-temperature, falling from a frosty 45.9°F (7.7°C) in November to a subzero cold 30°F (-1.1°C). During December, the average low-temperature is a still freezing cold 18°F (-7.8°C).Humidity
In Vermillion, the average relative humidity in December is 82%.Rainfall
In Vermillion, in December, during 3.5 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. Throughout the year, there are 116.6 rainfall days, and 21.26" (540mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Vermillion, in December, during 6.6 snowfall days, 2.64" (67mm) of snow is typically accumulated. In Vermillion, during the entire year, snow falls for 30.7 days and aggregates up to 13.9" (353mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:39 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:58 am and sunset at 5:03 pm CST.
Sunshine
The average sunshine in December is 4.7h.UV index
In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 2 in December translates into this advice:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Around midday, solar radiation is most harmful; hence, exposure should be limited. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Vermillion, SD
- Average high temperature in December: 30°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 (26.8°F).
- Average low temperature in December: 18°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).
Average pressure in December
Vermillion, 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 (29.85"Hg).
Average wind speed in December
Vermillion, SD
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in December
Vermillion, SD
- Average humidity in December: 82%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (65%).
Average rainfall in December
Vermillion, SD
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is June (3.35").
The driest months (with the least rainfall) are January and February (0.63").
Average rainfall days in December
Vermillion, SD
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is June (17.3 days).
The months with the least rainy days are January and February (2.8 days).
Average snowfall in December
Vermillion, SD
- Average snowfall in December: 2.64"
The months with the highest snowfall are January and February (2.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Vermillion, SD
- Average snowfall days in December: 6.6 days
The month with the highest number of snowfall days is February (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Vermillion, SD
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Vermillion, SD
- Average sunshine days in December: 21.6 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in December
Vermillion, 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 January (UV index 1).
Average cloud cover in December
Vermillion, SD
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in December
Vermillion, 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).
