Cave temperature is a constant 48 degrees, so a jacket or sweater is recommended.
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In fact, no human can spend more than a mere few minutes inside the cave. Temperatures of 150°F (65.6°C) have been recorded in the main chamber, whilst the smaller caverns are slightly cooler at 100°F (37.8°C). To add an extra layer of danger, conditions are close to 100% relative humidity.
Exploring Sequoia's Crystal CaveTours include: Family Tour: 50 minute tour for all ages. Thirteen and Older Tour: 50 minute tour for ages 13 and up. Discovery Tour: 1 1/2 hours for ages 13 and up.
NAICA CAVE OF CRYSTALS Mexico - DEADLY GIANT Selenite Crystals Cave. There is a place on Earth with such high temperature and humidity conditions that if you stay there for more than about 20 minutes, you could drown in the vapors of your own breath.
The temperature of a cave is usually close to the average annual temperature for the region where it's located. For example, caves in Texas can be as warm as 70º F. Caves in Missouri might be between 55º F and 60º F. Caves in Wisconsin might be a chilly 50º F.
Crystal Cave is a multi-level solutional cave formed in dolomite bedrock in the Prairie du Chien Group. The dolomite was formed 485 million years ago during the Lower Ordovician Period when a warm shallow ocean covered much of Minnesota and Wisconsin. It is Wisconsin's longest known cave.