Weather in caves tends to be very constant compared to surface conditions. Lehman Caves is 50 degrees Fahrenheit year round. The relative humidity varies between 90 and 100 percent.
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Move with care
Do not run or jump in a cave. Plan each move carefully.
Do not enter a cave when there is rain predicted in the area. Cave often flood suddenly.
Never touch or damage stalactites or other cave formations. These take thousands of years to grow.
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.
When the cloud hits the roof of the cave, which is often higher than 300-500 feet, droplets of water fall everywhere simulating rain, a very rare occurrence within caves, Limbert said.