December weather forecastHarrisburg, SD
December
Weather in December
December heralds the arrival of a full-fledged winter in Harrisburg. The crisp frosty weather is accompanied by the return of significant snowfall, adding a festive spirit to the city. Amongst the winter months, December stands out with the highest amount of snowfall, recording a noteworthy 3.31" (84mm). Despite the diminished daylight hours, the evident winter wonderland is a sight to behold.Temperature
In Harrisburg, stepping into December signifies a significant temperature decrement, moving down from November's chilly 43.7°F (6.5°C) to a freezing cold 28°F (-2.2°C). December nights are marked by an average low-temperature of 16.2°F (-8.8°C).Humidity
The average relative humidity in December is 84%.Rainfall
In Harrisburg, during December, the rain falls for 4 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, in Harrisburg, there are 119.2 rainfall days, and 21.73" (552mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Harrisburg, during December, snow falls for 9.9 days and regularly aggregates up to 3.31" (84mm) of snow. In Harrisburg, during the entire year, snow falls for 40.5 days and aggregates up to 16.77" (426mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 7:40 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 5:00 pm CST.
Sunshine
In Harrisburg, the average sunshine in December is 4.5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: An average maximum UV index of 2 in December leads to these recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Harrisburg, SD
- Average high temperature in December: 28°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (24.1°F).
- Average low temperature in December: 16.2°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).
Average pressure in December
Harrisburg, 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 (29.86"Hg).
Average wind speed in December
Harrisburg, SD
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in December
Harrisburg, SD
- Average humidity in December: 84%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (66%).
Average rainfall in December
Harrisburg, SD
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is June (3.35").
The driest months (with the least rainfall) are January, February and November (0.67").
Average rainfall days in December
Harrisburg, SD
- Average rainfall days in December: 4 days
The month with the highest number of rainy days is June (17.7 days).
The month with the least rainy days is January (3.3 days).
Average snowfall in December
Harrisburg, SD
- Average snowfall in December: 3.31"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Harrisburg, SD
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is December (9.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Harrisburg, 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 30min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Harrisburg, SD
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is November (21 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in December
Harrisburg, SD
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Harrisburg, SD
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in December
Harrisburg, 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).
