Mammoth Cave National Park
Weather
The temperature in the cave is approximately 54 degrees Fahrenheit year-round but can fluctuate as much as six degrees either way in passageways close to the surface. Entrances may be very cold. The lower passages are more constant. A light jacket or sweatshirt is recommended.
Above Ground Temperatures
| Month | Normal Highs | Normal Lows |
| January | 45 | 25 |
| February | 49 | 26 |
| March | 58 | 35 |
| April | 70 | 45 |
| May | 78 | 52 |
| June | 86 | 60 |
| July | 88 | 64 |
| August | 88 | 62 |
| September | 82 | 56 |
| October | 72 | 44 |
| November | 58 | 36 |
| December | 48 | 28 |
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