The weather outside might be frightful, but the temperature inside Mammoth Cave is a delightful 54 degrees year-round.When you start getting winter cabin fever and you dont want to get outside, its a great place for a change of pace, said Joe McGown, fee manager for Mammoth Cave National Park. With the exception of the entrance, its actually quite a bit warmer inside the cave than it is outside. Youll be able to see a lot of fascinating geological formations and cave passageways and have a lot better temperatures in the process of doing it.Between Christmas and New Years Day, Mammoth Cave will receive around 500 to 1,000 visitors a day, according to McGown.We get quite a bit of Christmas break travel, he said. People who are traveling back and forth between families. We had about 100 people on the 11 a.m. Historic Tour (Tuesday). The Travertine, Frozen Niagara and Grand Avenue tours were averaging around 40 people Tuesday, according to Teddy Messenger, supervisor of information services at the park. Weve been getting a tremendous amount of phone calls today about visiting later in the week, he said Tuesday. Several of the tours will be full later in the week. We add additional guides during the period between Christmas and the new year. With temperatures hovering around the upper 20s, several people find it surprising they can go underground to get warm, Messenger said. Weve had a lot of comments asking, Am I dressed warm enough? or Its warmer in the cave, isnt it? he said. A lot of people are saying, Were going into the cave where its warmer.Mike Miller, a park ranger who works in the ticket office, said some out-of-state visitors are worried about the weather forecast, which calls for snow Thursday through Friday.I just had a fellow come in almost hysterical because its snowing outside, he said, laughing. Theres about three flakes, but hes from California, so three flakes are a white-out for him. So, we have a lot of people wanting to beat the bad weather.