December weather forecastEgan, SD
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Egan, South Dakota, with temperature in the range of an average low of 14.4°F (-9.8°C) and an average high of 25.7°F (-3.5°C).Temperature
The arrival of December signals a clear decrease in the average high-temperature, falling from an icy 41.7°F (5.4°C) in November to a subzero cold 25.7°F (-3.5°C). December nights experience a consistent temperature drop to 14.4°F (-9.8°C).Humidity
In December, the average relative humidity is 86%.Rainfall
In December, the rain falls for 3.8 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. In Egan, during the entire year, the rain falls for 113.8 days and collects up to 20.59" (523mm) of precipitation.Snowfall
Months with snowfall in Egan, South Dakota, are January through May, October through December. The month with the most snowfall in Egan is December, when snow falls for 11.6 days and typically aggregates up to 4.8" (122mm) of snow.Daylight
December has the shortest days of the year in Egan, with an average of 9h and 0min of daylight.On the first day of December in Egan, sunrise is at 7:42 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 4:58 pm CST.
Sunshine
The average sunshine in December in Egan, South Dakota, is 4.1h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 1 suggests this advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Opt for tightly woven and loose clothing to enhance protection from the Sun. 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
Egan, SD
- Average high temperature in December: 25.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (21.6°F).
- Average low temperature in December: 14.4°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (7.7°F).
Average pressure in December
Egan, 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
Egan, SD
- Average wind speed in December: 10.6mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity in December
Egan, SD
- Average humidity in December: 86%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (68%).
Average rainfall in December
Egan, SD
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is June (3.15").
The driest months (with the least rainfall) are January and November (0.63").
Average rainfall days in December
Egan, SD
- Average rainfall days in December: 3.8 days
The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is February (2.4 days).
Average snowfall in December
Egan, SD
- Average snowfall in December: 4.8"
The month with the highest snowfall is December (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Egan, SD
- Average snowfall days in December: 11.6 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Egan, 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 6min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Egan, SD
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in December
Egan, SD
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Egan, SD
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in December
Egan, 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).
