Mammoth Cave weather, month by month
- Jul high
- 91°F
- hottest month
- Jan low
- 29°F
- coldest month
- Rain + snowmelt
- 53.5in / yr
- wettest: May
- Snowfall
- 4.0in / yr
- Dec–Feb
- Days ≥ 90°F
- 54/ yr
- Nights ≤ 32°F
- 78/ yr
Mammoth Cave
Month by month
| Month | High | Low | Rain | Snow | Wet days | Sunrise | Sunset | Daylight | Crowds |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 48° | 29° | 3.7″ | 0.7″ | 12 | 6:57 AM | 4:50 PM | 9h 53m | 15 |
| Feb | 53° | 32° | 4.5″ | 1.4″ | 11 | 6:34 AM | 5:24 PM | 10h 50m | 21 |
| Mar | 62° | 40° | 5.0″ | 0.6″ | 13 | 6:56 AM | 6:51 PM | 11h 56m | 62 |
| Apr | 73° | 48° | 4.9″ | — | 12 | 6:10 AM | 7:19 PM | 13h 09m | 63 |
| May | 81° | 57° | 5.2″ | — | 12 | 5:36 AM | 7:46 PM | 14h 10m | 62 |
| Jun | 88° | 64° | 4.8″ | — | 12 | 5:24 AM | 8:06 PM | 14h 42m | 84 |
| Jul | 91° | 68° | 4.9″ | — | 11 | 5:36 AM | 8:05 PM | 14h 29m | 100 |
| Aug | 90° | 67° | 3.8″ | — | 9 | 6:01 AM | 7:37 PM | 13h 36m | 69 |
| Sep | 85° | 60° | 4.0″ | — | 8 | 6:27 AM | 6:53 PM | 12h 27m | 58 |
| Oct | 74° | 49° | 3.8″ | — | 9 | 6:52 AM | 6:08 PM | 11h 16m | 56 |
| Nov | 61° | 40° | 4.1″ | — | 10 | 6:23 AM | 4:35 PM | 10h 11m | 33 |
| Dec | 51° | 33° | 4.8″ | 1.3″ | 12 | 6:51 AM | 4:28 PM | 9h 37m | 29 |
Sweet spot: September, October and November combine average highs between 55°F and 85°F with crowds under 60% of the peak month. Check what is open in those months — quiet can also mean closed roads.
How to read this
These are NOAA’s official 1991–2020 climate normals for one weather station, not a model of the whole park. The station is the one with complete temperature and precipitation normals nearest to a visitor center. Highs and lows are daily averages for the month; “wet days” are days with at least 0.01 inch of precipitation. Mountain parks can be 10–20 °F cooler at their high points than at the station, and the NPS weather page for Mammoth Cave is the place for current conditions and seasonal closures.
Sunrise and sunset are computed with the NOAA solar equations for the park’s coordinates and shown in America/Chicago time for the 15th of each month of 2027; they are accurate to about a minute.
Sources · 3
- 1.U.S. Climate Normals 1991–2020 — monthly normals station inventory · National Centers for Environmental Information (NOAA)
- 2.Mammoth Cave National Park — Weather (nps.gov) · National Park Service
- 3.Mammoth Cave National Park — Visitor Use Statistics · National Park Service (IRMA)
FAQ
Mammoth Cave weather questions
- What is the hottest month at Mammoth Cave?
- July, with an average high of 91°F and an average low of 68°F at Mammoth Cave (NOAA 1991–2020 normals). The station averages 54 days a year at or above 90°F.
- How cold does Mammoth Cave get in winter?
- January is the coldest month, averaging a low of 29°F and a high of 48°F at Mammoth Cave. About 78 nights a year drop to freezing or below.
- Does it snow at Mammoth Cave?
- Yes. Mammoth Cave averages 4.0 inches of snow a year, mostly in February and December. Higher ground in the park gets more.
- When is the rainy season at Mammoth Cave?
- May is the wettest month on average (5.2 inches of precipitation at Mammoth Cave); the station's annual total is 53.5 inches.
- How many hours of daylight does Mammoth Cave get?
- About 14h 42m on June 15 and 9h 37m on December 15 (sunrise 5:24 AM, sunset 8:06 PM in June; 6:51 AM to 4:28 PM in December, America/Chicago time).
- What is the best month to visit Mammoth Cave for weather?
- By NOAA's normals, average highs sit between 55°F and 85°F in March, April, May, September, October and November. Of those, September, October and November are also well below the park's peak crowds. Weather in the park varies with elevation; this is the Mammoth Cave station.
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