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
A clear decrease in the average high-temperature is observed during December, decreasing from a wintry 41.2°F (5.1°C) in November to a freezing cold 25.9°F (-3.4°C). In the month of December, the average low-temperature usually rests at a still subzero cold 14.4°F (-9.8°C).Humidity
The average relative humidity in December is 82%.Rainfall
In Summerville, South Dakota, in December, during 3.7 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. 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 December, it is snowing for 12.5 days. Throughout December, 2.52" (64mm) of snow is accumulated. Throughout the year, there are 65.8 snowfall days, and 21.42" (544mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:10 am and sunset at 4:05 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:14 pm MST.
Sunshine
The average sunshine in December is 4.8h.UV index
December is the month with the lowest UV index in Summerville, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 1 during December, leads to the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Summerville in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Summerville have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Summerville have in December?
When is the lowest UV index?
How high is the UV index in December?
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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