Delve into the depths of exploration at Jewel Cave National Monument, a captivating underground wonder that boasts over 220 miles of mapped and surveyed passages, making it one of the longest caves on the planet. As you venture through this underground wilderness, you'll be drawn in by the alluring beauty of delicate formations and stunning bursts of color that adorn its walls. For those with a thirst for adventure, the intricate maze of passages within Jewel Cave is a siren call, tempting explorers to uncover its hidden secrets and mysteries. This underground treasure trove not only captivates the imagination but also holds valuable scientific insights waiting to be unraveled. As a true gem within the National Park Service, Jewel Cave National Monument stands as a testament to the wonders of nature that lie beneath the surface. Whether you're an avid spelunker or a curious traveler, a visit to Jewel Cave promises an unforgettable journey into the heart of this subterranean marvel.

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Weather in the Black Hills varies significantly throughout the year and may be drastically different from the northern hills to the southern hills. The temperatures listed are for average lows to average highs in the location of Custer, South Dakota. Spring ~ Temp. Range of 29°F to 53°F / Summer ~ Temp. Range of 54°F to 80°F / Fall ~ Temp. Range of 33°F to 58°F / Winter ~ Temp. Range of 14°F to 37°F The yearly average rain is 19 in., with May being the wettest month. The yearly average snow is 48 in.