Rapid City Snowfall Totals & Accumulation Averages
This page pulls together information on when, how much and how often Rapid City, South Dakota has snow.
There are data and descriptions here of how many days it snows and the total amount of snowfall that Rapid City usually gets. There are also monthly and yearly counts of the days that the city normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when Rapid City can expect the first and last snowfalls of the season.
The first set of monthly snow totals are averages for 2010 to 2019. All the other numbers are long-term historical averages based on weather data gathered from 1991 to 2020 in Rapid City.
How Often it Snows in Rapid City
The next two tables list monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).
These averages don't show how much the snowfall in Rapid City varies from year to year.
In December, for instance, one in four years totals over 10.3 inches of snow. Another 25 percent of years receive less than 3.2 inches for the month.
Similarly in January, fresh snowfall in the heaviest years amounts to over 7.3 inches, while the lightest years get less than 2.5 inches.
New snow for February ranges from over 8.2 inches in heavy snowfall years to under 4.7 inches in light years.
When Rapid City Has Its First & Last Snowfalls
The first snowfall of winter for Rapid City usually arrives in November. But snow can start falling as early as September.
The season's last snowfall typically happens in April. Every few years, May also gets fresh snow.
Rapid City is normally free of snow every year from June to August.
How Many Snowstorms Rapid City Gets
Most days of snowfall in Rapid City leave just a skiff, amounting to less than an inch, of fresh snow on the ground. For 15 days a year on average, the amount of new snow totals at least an inch.
Snowstorms of over five inches a day normally occur a couple times a year. But major blizzards that dump ten inches or more in one day are rare events that don't happen every year.
How Much Snow Normally Accumulates in Rapid City
For about one-third of winter days, Rapid City has at least an inch of snow on the ground.
Typically, on one or two days a year the snow covering Rapid City builds up to ten or more inches deep.
Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.
NOAA National Centers for Environmental Information (NCEI). Climate Normals.