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
Rapid City's average high-temperature decreases in December, falling from a wintry 41.9°F (5.5°C) in November to a still icy 32°F (0°C). A steady low-temperature average of 25.7°F (-3.5°C) is logged in Rapid City during December, reflecting a modest dip from daytime readings.Humidity
In December, the average relative humidity in Rapid City is 84%.Rainfall
In December, the rain falls for 7 days. Throughout December, 2.13" (54mm) of precipitation is accumulated. In Rapid City, during the entire year, the rain falls for 136.2 days and collects up to 24.65" (626mm) of precipitation.Snowfall
Months with snowfall in Rapid City are January through May, October through December. In Rapid City, in December, during 18.1 snowfall days, 5.35" (136mm) of snow is typically accumulated. Throughout the year, in Rapid City, there are 89.8 snowfall days, and 28.03" (712mm) of snow is accumulated.Daylight
December has the shortest days of the year in Rapid City, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:59 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 8:18 am and sunset at 5:10 pm EST.
Sunshine
The average sunshine in December is 2.2h.UV index
The months with the lowest UV index are January, February, November and 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 rays for average individuals.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Rapid City in December?
What is the average humidity in December in Rapid City?
How much does it rain in Rapid City in December?
How many days does it snow in December in Rapid City?
What is the month with the shortest days in Rapid City?
What is the average length of the day in December in Rapid City?
When are sunrise and sunset in December in Rapid City?
How long on average sun shines in December in Rapid City?
What is the month with the lowest UV index in Rapid City?
What is the UV index intensity in December in Rapid City?
Average temperature in December
Rapid City, MI
- Average high temperature in December: 32°F
The warmest month (with the highest average high temperature) is August (72.1°F).
The month with the lowest average high temperature is January (25.7°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is August (60.4°F).
The coldest months (with the lowest average low temperature) are January and February (18.9°F).
Average pressure in December
Rapid City, MI
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Rapid City, MI
- Average wind speed in December: 12.6mph
The windiest months (with the highest average wind speed) are January, November and December (12.6mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in December
Rapid City, MI
- Average humidity in December: 84%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and May (77%).
Average rainfall in December
Rapid City, MI
- Average rainfall in December: 2.13"
The wettest month (with the highest rainfall) is October (2.91").
The driest month (with the least rainfall) is February (1.54").
Average rainfall days in December
Rapid City, MI
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is October (17.9 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in December
Rapid City, MI
- Average snowfall in December: 5.35"
The month with the highest snowfall is January (6.57").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rapid City, MI
- Average snowfall days in December: 18.1 days
The month with the highest number of snowfall days is January (21.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rapid City, MI
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 2h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 1h and 42min).
Average sunshine days in December
Rapid City, MI
- Average sunshine days in December: 6.5 days
The month with the most sunshine days is May (14.7 days).
The month with the least sunshine days is January (4.7 days).
Average UV index in December
Rapid City, MI
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Rapid City, MI
- Average cloud cover in December: 79
The month with the most cloud cover is January (Cloud cover 83).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Rapid City, MI
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Rapid City, Michigan, USA
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