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 start of December is characterized by a significant decrease in the average high-temperature, moving from an icy 41.2°F (5.1°C) in November to a subzero cold 25.9°F (-3.4°C). An average low-temperature of 14.4°F (-9.8°C) is recorded in the month of December.Humidity
The average relative humidity in December in Summerville is 82%.Rainfall
In Summerville, during December, the rain falls for 3.7 days and regularly aggregates up to 0.55" (14mm) of precipitation. Throughout the year, there are 101.3 rainfall days, and 14.25" (362mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Summerville. In Summerville, during December, snow falls for 12.5 days and regularly aggregates up to 2.52" (64mm) of snow. Throughout the year, in Summerville, there are 65.8 snowfall days, and 21.42" (544mm) of snow is accumulated.Daylight
With an average of 8h and 42min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:10 am and sunset at 4:05 pm. On the last day of December, in Summerville, sunrise is at 7:29 am and sunset at 4:14 pm MST.
Sunshine
The average sunshine in December is 4.8h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 1 in December interprets into the following advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Frequently asked questions
How cold is it in Summerville in December?
What is the average humidity in December in Summerville?
How many days does it rain in December in Summerville?
How many days does it snow in December in Summerville?
What is the month with the shortest days in Summerville?
How many hours of daylight does Summerville have in December?
When are sunrise and sunset in December in Summerville?
How long on average sun shines in December in Summerville?
When is the lowest UV index in Summerville?
What is the UV index intensity in December in Summerville?
Average temperature in December
Summerville, SD
- Average high temperature in December: 25.9°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in December: 14.4°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in December
Summerville, SD
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Summerville, SD
- Average wind speed in December: 10.9mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).
Average humidity in December
Summerville, SD
- Average humidity in December: 82%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are August and September (51%).
Average rainfall in December
Summerville, SD
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is June (2.28").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in December
Summerville, SD
- Average rainfall days in December: 3.7 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is January (2.9 days).
Average snowfall in December
Summerville, SD
- Average snowfall in December: 2.52"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Summerville, SD
- Average snowfall days in December: 12.5 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Summerville, SD
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Summerville, SD
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in December
Summerville, SD
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Summerville, SD
- Average cloud cover in December: 51
The months with the most cloud cover are January and February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 20).
Average visibility in December
Summerville, 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).
Summerville, South Dakota, USA
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