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
December, noted for its average high-temperature of 0.3°C (32.5°F) and an average low-temperature of -7.4°C (18.7°F), is considered the coldest month.Humidity
The average relative humidity in December is 74%.Rainfall
In Rapid City, in December, it is raining for 4.8 days, with typically 16mm (0.63") of accumulated precipitation. In Rapid City, during the entire year, the rain falls for 118.8 days and collects up to 391mm (15.39") of precipitation.Snowfall
Months with snowfall are January through May, September through December. In Rapid City, in December, during 8.1 snowfall days, 67mm (2.64") of snow is typically accumulated. Throughout the year, there are 50.4 snowfall days, and 620mm (24.41") of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:08 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:24 pm MST.
Sunshine
In December, the average sunshine is 6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rapid City. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 2 in December translates into these instructions:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
How cold is it in December?
What is the average humidity in December in Rapid City?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Rapid City have in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Rapid City, SD
- Average high temperature in December: 0.3°C
The warmest month (with the highest average high temperature) is July (29.3°C).
The month with the lowest average high temperature is December (0.3°C).
- Average low temperature in December: -7.4°C
The month with the highest average low temperature is July (17.4°C).
The coldest month (with the lowest average low temperature) is February (-7.9°C).
Average pressure in December
Rapid City, SD
- Average pressure in December: 1020.2mbar
The month with the highest atmospheric pressure is January (1020.5mbar).
The month with the lowest atmospheric pressure is June (1010.6mbar).
Average wind speed in December
Rapid City, SD
- Average wind speed in December: 14.4km/h
The windiest month (with the highest average wind speed) is April (16.5km/h).
The calmest month (with the lowest average wind speed) is August (13.2km/h).
Average humidity in December
Rapid City, SD
- Average humidity in December: 74%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are August and September (50%).
Average rainfall in December
Rapid City, SD
- Average rainfall in December: 16mm
The wettest month (with the highest rainfall) is May (58mm).
The driest month (with the least rainfall) is January (11mm).
Average rainfall days in December
Rapid City, SD
- Average rainfall days in December: 4.8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is December (4.8 days).
Average snowfall in December
Rapid City, SD
- Average snowfall in December: 67mm
The month with the highest snowfall is April (138mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in December
Rapid City, SD
- Average snowfall days in December: 8.1 days
The month with the highest number of snowfall days is February (10.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Rapid City, SD
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 6h and 0min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in December
Rapid City, SD
- Average sunshine days in December: 19.6 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (11 days).
Average UV index in December
Rapid City, 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
Rapid City, SD
- Average cloud cover in December: 36
The months with the most cloud cover are February and April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in December
Rapid City, SD
- Average visibility in December: 9km
The months with the highest visibility are June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, November and December (9km).
Rapid City, South Dakota, USA
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