Once a cave builds up a sizable mass of ice and a large volume of the surrounding bedrock becomes cold, thermal inertia propels frigid temperatures through the heat of summer.
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During the winter they can go down to -10°C (14°F), and even below that. They are made of ice after all! That's why it's really important that you wrap up warm when visiting the caves. If you suffer too much from the cold, you just won't enjoy the experience as much as you could.
An ice cave is any type of natural cave (most commonly lava tubes or limestone caves) that contains significant amounts of perennial (year-round) ice. At least a portion of the cave must have a temperature below 0 °C (32 °F) all year round, and water must have traveled into the cave's cold zone.
An Underground IceboxThe wet surfaces caves and transparent nature of ice make for a delightful light show in the ice caves. Ice caves are well represented in our National Parks with such caves found at Craters of the Moon National Monument (Idaho) and at Sunset Crater National Monument (Arizona).
In fact, the USDA Forest Service has ice caves in the Gifford Pinchot National Forest in Washington state, the Mendenhall Glacier in Juneau, Alaska, and the very well-known Big Four Ice Caves in Washington state's Mount Baker-Snoqualmie National Forest.
Glacier ice is blue because the red (long wavelengths) part of white light is absorbed by ice and the blue (short wavelengths) light is transmitted and scattered.