Hail is the dominant weather threat at Minuteman Missile National Historic Site, with 47 recorded hail events in Pennington County making it the leading hazard for visitors to this South Dakota site. Thunderstorm wind events aren't far behind at 33 recorded incidents, and the two frequently travel together across the open prairie here. Storms can develop and intensify quickly with little geographic shelter to slow them down.
When severe weather moves in, get your family into a hard-sided RV or vehicle immediately — tent camping offers no meaningful protection from large hail or 60-mph gusts. Keep a battery-powered NOAA weather radio in your kit so you receive storm warnings before you can see the clouds building on the horizon. If you're out on the grounds during a visit, identify the nearest solid structure ahead of time and don't wait for rain to start before moving toward it.
Top recorded hazards in Pennington County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Hail 47
- Thunderstorm Wind 33
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About Minuteman Missile National Historic Site
During the Cold War, a vast arsenal of nuclear missiles were placed in the Great Plains. Hidden in plain sight, for thirty years 1,000 missiles were kept on constant alert; hundreds remain today. The Minuteman Missile remains an iconic weapon in the American nuclear arsenal. It holds the power to destroy civilization, but is meant as a nuclear deterrent to maintain peace and prevent war.
Weather
Rapid weather changes are common in the western South Dakota area where Minuteman Missile National Historic Site is located. Variations from season to season and from year to year are great. Characteristics of the climate are hot dry summers and bitterly cold winters. Wind is a constant on the Great Plains, winds in excess of 50 mph not uncommon. During the winter season, winds typically blow from the north-northwest and have been known to cause wind chills in excess of -40 degrees.