Mammoth Cave Weather Records (USC00155097)
Record envelope, standing records and threshold days for Mammoth Cave (USC00155097), Kentucky, United States, with 93 years of record.
Key Facts for Mammoth Cave
- Mammoth Cave (USC00155097) is a weather station in Kentucky, United States at 37.13 latitude and -86.15 longitude, 232 m (760 ft) above sea level.
- The station reports from 1934 to 2026, 93 years of record.
- 1,464 records set at Mammoth Cave still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Mammoth Cave set a daily record high maximum temperature of 37.8 C (100.0 F) on 20 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Kentucky, United States, 37.13 latitude, -86.15 longitude.
- Elevation: 232 m (760 ft).
- Period of record: 1934 to 2026, 93 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
21 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 26.7 C (80.1 F) | -28.9 C (-20.0 F) | 21.1 C (70.0 F) | -16.1 C (3.0 F) |
| Feb | 27.8 C (82.0 F) | -29.4 C (-20.9 F) | 23.9 C (75.0 F) | -15.0 C (5.0 F) |
| Mar | 30.6 C (87.1 F) | -21.1 C (-6.0 F) | 30.6 C (87.1 F) | -5.0 C (23.0 F) |
| Apr | 32.8 C (91.0 F) | -7.8 C (18.0 F) | 30.0 C (86.0 F) | 2.2 C (36.0 F) |
| May | 35.6 C (96.1 F) | -2.8 C (27.0 F) | 33.9 C (93.0 F) | 0.6 C (33.1 F) |
| Jun | 42.2 C (108.0 F) | 0.0 C (32.0 F) | 35.0 C (95.0 F) | 11.7 C (53.1 F) |
| Jul | 42.2 C (108.0 F) | 4.4 C (39.9 F) | 36.1 C (97.0 F) | 15.6 C (60.1 F) |
| Aug | 40.6 C (105.1 F) | 2.8 C (37.0 F) | 37.8 C (100.0 F) | 13.9 C (57.0 F) |
| Sep | 41.1 C (106.0 F) | -1.7 C (28.9 F) | 38.9 C (102.0 F) | 7.8 C (46.0 F) |
| Oct | 37.2 C (99.0 F) | -7.8 C (18.0 F) | 33.9 C (93.0 F) | 8.9 C (48.0 F) |
| Nov | 33.9 C (93.0 F) | -22.2 C (-8.0 F) | n/a | n/a |
| Dec | 26.7 C (80.1 F) | -27.8 C (-18.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1934 | 10 |
| 1935 | 23 |
| 1936 | 46 |
| 1937 | 30 |
| 1938 | 17 |
| 1939 | 17 |
| 1940 | 32 |
| 1941 | 13 |
| 1942 | 29 |
| 1943 | 36 |
| 1944 | 24 |
| 1945 | 31 |
| 1946 | 11 |
| 1947 | 22 |
| 1948 | 8 |
| 1949 | 18 |
| 1950 | 42 |
| 1951 | 27 |
| 1952 | 33 |
| 1953 | 20 |
| 1954 | 24 |
| 1955 | 16 |
| 1956 | 7 |
| 1957 | 6 |
| 1958 | 12 |
| 1959 | 10 |
| 1960 | 24 |
| 1961 | 12 |
| 1962 | 15 |
| 1963 | 29 |
| 1964 | 16 |
| 1965 | 12 |
| 1966 | 8 |
| 1967 | 25 |
| 1968 | 14 |
| 1969 | 15 |
| 1970 | 16 |
| 1971 | 10 |
| 1972 | 14 |
| 1973 | 5 |
| 1974 | 18 |
| 1975 | 8 |
| 1976 | 16 |
| 1977 | 19 |
| 1978 | 10 |
| 1979 | 8 |
| 1980 | 23 |
| 1981 | 10 |
| 1982 | 18 |
| 1983 | 21 |
| 1984 | 10 |
| 1985 | 10 |
| 1986 | 18 |
| 1987 | 6 |
| 1988 | 10 |
| 1989 | 28 |
| 1990 | 8 |
| 1991 | 14 |
| 1992 | 15 |
| 1993 | 15 |
| 1994 | 7 |
| 1995 | 11 |
| 1996 | 12 |
| 1997 | 12 |
| 1998 | 11 |
| 1999 | 15 |
| 2000 | 10 |
| 2001 | 10 |
| 2002 | 16 |
| 2003 | 7 |
| 2004 | 17 |
| 2005 | 8 |
| 2006 | 4 |
| 2008 | 3 |
| 2009 | 14 |
| 2010 | 13 |
| 2011 | 21 |
| 2012 | 27 |
| 2013 | 5 |
| 2014 | 4 |
| 2015 | 16 |
| 2016 | 16 |
| 2017 | 18 |
| 2018 | 16 |
| 2019 | 20 |
| 2020 | 11 |
| 2021 | 7 |
| 2022 | 14 |
| 2023 | 10 |
| 2024 | 10 |
| 2025 | 13 |
| 2026 | 22 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1984-05-07 | Record daily precipitation | Record daily precipitation 172.7 mm (6.8 in) |
| 1988-08-16 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
Wettest Day of Each Month
May: 172.7 mm (6.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 88.6 mm (3.5 in) | 19 January 1935 |
| Feb | 98.0 mm (3.9 in) | 14 February 1949 |
| Mar | 114.3 mm (4.5 in) | 1 March 1997 |
| Apr | 98.0 mm (3.9 in) | 4 April 2025 |
| May | 172.7 mm (6.8 in) | 7 May 1984 |
| Jun | 86.6 mm (3.4 in) | 28 June 2026 |
| Jul | 124.0 mm (4.9 in) | 19 July 1941 |
| Aug | 100.8 mm (4.0 in) | 23 August 1942 |
| Sep | 163.8 mm (6.4 in) | 1 September 2017 |
| Oct | 81.5 mm (3.2 in) | 2 October 1962 |
| Nov | 169.2 mm (6.7 in) | 18 November 1957 |
| Dec | 101.6 mm (4.0 in) | 8 December 1978 |
Period of Record Coverage
1934 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1934 | 170 | 47% | No |
| 1935 | 352 | 96% | Yes |
| 1936 | 357 | 98% | Yes |
| 1937 | 329 | 90% | Yes |
| 1938 | 361 | 99% | Yes |
| 1939 | 357 | 98% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 363 | 99% | Yes |
| 1943 | 363 | 99% | Yes |
| 1944 | 365 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 363 | 99% | Yes |
| 1948 | 342 | 93% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 360 | 99% | Yes |
| 1955 | 364 | 100% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 361 | 99% | Yes |
| 1958 | 358 | 98% | Yes |
| 1959 | 359 | 98% | Yes |
| 1960 | 363 | 99% | Yes |
| 1961 | 362 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 362 | 99% | Yes |
| 1967 | 363 | 99% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 364 | 99% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 362 | 99% | Yes |
| 1977 | 362 | 99% | Yes |
| 1978 | 360 | 99% | Yes |
| 1979 | 340 | 93% | Yes |
| 1980 | 358 | 98% | Yes |
| 1981 | 363 | 99% | Yes |
| 1982 | 317 | 87% | No |
| 1983 | 354 | 97% | Yes |
| 1984 | 349 | 95% | Yes |
| 1985 | 344 | 94% | Yes |
| 1986 | 346 | 95% | Yes |
| 1987 | 354 | 97% | Yes |
| 1988 | 354 | 97% | Yes |
| 1989 | 353 | 97% | Yes |
| 1990 | 318 | 87% | No |
| 1991 | 321 | 88% | No |
| 1992 | 260 | 71% | No |
| 1993 | 297 | 81% | No |
| 1994 | 277 | 76% | No |
| 1995 | 344 | 94% | Yes |
| 1996 | 331 | 90% | Yes |
| 1997 | 338 | 93% | Yes |
| 1998 | 339 | 93% | Yes |
| 1999 | 346 | 95% | Yes |
| 2000 | 363 | 99% | Yes |
| 2001 | 360 | 99% | Yes |
| 2002 | 357 | 98% | Yes |
| 2003 | 296 | 81% | No |
| 2004 | 355 | 97% | Yes |
| 2005 | 263 | 72% | No |
| 2006 | 90 | 25% | No |
| 2008 | 122 | 33% | No |
| 2009 | 362 | 99% | Yes |
| 2010 | 357 | 98% | Yes |
| 2011 | 346 | 95% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 364 | 100% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 363 | 99% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 272 | 75% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 20 September 2026 | Mammoth Cave, US | daily high max (Provisional) | 37.8 C (100.0 F) | 2.2 C (4.0 F) | 71 years | 35 of 100 (Notable) |
| 20 September 2026 | Mammoth Cave, US | daily high min (Tie, Provisional) | 21.7 C (71.1 F) | tie | 43 years | 5 of 100 (Routine) |
| 19 September 2026 | Mammoth Cave, US | daily high min (Tie, Provisional) | 21.1 C (70.0 F) | tie | 24 years | 4 of 100 (Routine) |
| 17 September 2026 | Mammoth Cave, US | daily high max (Provisional) | 36.1 C (97.0 F) | 1.1 C (2.0 F) | 71 years | 32 of 100 (Routine) |
| 17 September 2026 | Mammoth Cave, US | daily high min (Provisional) | 22.2 C (72.0 F) | 1.1 C (2.0 F) | 60 years | 29 of 100 (Routine) |
| 16 September 2026 | Mammoth Cave, US | daily high min (Provisional) | 22.2 C (72.0 F) | 1.1 C (2.0 F) | 35 years | 21 of 100 (Routine) |
| 16 September 2026 | Mammoth Cave, US | daily high max (Tie, Provisional) | 36.1 C (97.0 F) | tie | 7 years | 2 of 100 (Routine) |
| 15 September 2026 | Mammoth Cave, US | daily high max (Provisional) | 36.7 C (98.1 F) | 0.6 C (1.1 F) | 72 years | 31 of 100 (Routine) |
| 9 September 2026 | Mammoth Cave, US | daily high min (Tie, Provisional) | 21.7 C (71.1 F) | tie | 87 years | 8 of 100 (Routine) |
| 4 September 2026 | Mammoth Cave, US | daily high min (Provisional) | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 84 years | 35 of 100 (Notable) |
| 17 August 2026 | Mammoth Cave, US | daily high min (Tie, Provisional) | 22.8 C (73.0 F) | tie | 31 years | 4 of 100 (Routine) |
| 15 August 2026 | Mammoth Cave, US | daily high max (Tie, Provisional) | 36.7 C (98.1 F) | tie | 72 years | 7 of 100 (Routine) |
| 14 August 2026 | Mammoth Cave, US | daily high min (Tie) | 23.3 C (73.9 F) | tie | 83 years | 8 of 100 (Routine) |
| 21 July 2026 | Mammoth Cave, US | daily high min | 23.9 C (75.0 F) | 0.6 C (1.1 F) | 76 years | 33 of 100 (Routine) |
| 2 July 2026 | Mammoth Cave, US | daily high min (Tie) | 22.8 C (73.0 F) | tie | 73 years | 7 of 100 (Routine) |
| 28 June 2026 | Mammoth Cave, US | monthly rain | 86.6 mm (3.4 in) | 1.8 mm (0.07 in) | 53 years | 35 of 100 (Notable) |
| 8 June 2026 | Mammoth Cave, US | daily high min (Tie) | 21.7 C (71.1 F) | tie | 15 years | 3 of 100 (Routine) |
| 21 May 2026 | Mammoth Cave, US | daily rain | 103.9 mm (4.1 in) | 68.6 mm (2.7 in) | 79 years | 72 of 100 (Major) |
| 20 May 2026 | Mammoth Cave, US | daily high max | 33.9 C (93.0 F) | 1.1 C (2.0 F) | 81 years | 35 of 100 (Notable) |
| 19 May 2026 | Mammoth Cave, US | daily high max | 33.3 C (91.9 F) | 0.5 C (0.9 F) | 81 years | 34 of 100 (Routine) |
Climate Trend
77 complete years, 1935 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1935 | 13.4 C | -0.74 C |
| 1936 | 13.6 C | -0.54 C |
| 1938 | 14.5 C | +0.37 C |
| 1939 | 13.7 C | -0.47 C |
| 1940 | 11.8 C | -2.36 C |
| 1941 | 13.2 C | -1.00 C |
| 1942 | 12.7 C | -1.45 C |
| 1943 | 12.6 C | -1.59 C |
| 1944 | 13.2 C | -0.95 C |
| 1945 | 12.6 C | -1.60 C |
| 1946 | 13.8 C | -0.39 C |
| 1947 | 12.6 C | -1.61 C |
| 1949 | 14.2 C | -0.01 C |
| 1950 | 12.5 C | -1.69 C |
| 1951 | 13.3 C | -0.92 C |
| 1952 | 14.9 C | +0.70 C |
| 1953 | 14.9 C | +0.74 C |
| 1954 | 14.7 C | +0.56 C |
| 1955 | 14.2 C | +0.04 C |
| 1956 | 14.3 C | +0.10 C |
| 1957 | 14.4 C | +0.20 C |
| 1958 | 12.5 C | -1.72 C |
| 1959 | 13.6 C | -0.58 C |
| 1960 | 12.8 C | -1.40 C |
| 1961 | 13.5 C | -0.71 C |
| 1962 | 13.8 C | -0.36 C |
| 1963 | 13.5 C | -0.67 C |
| 1964 | 14.2 C | +0.04 C |
| 1965 | 13.8 C | -0.36 C |
| 1966 | 13.0 C | -1.16 C |
| 1967 | 13.3 C | -0.88 C |
| 1968 | 13.0 C | -1.21 C |
| 1969 | 12.8 C | -1.41 C |
| 1970 | 13.5 C | -0.64 C |
| 1971 | 13.9 C | -0.31 C |
| 1972 | 13.7 C | -0.52 C |
| 1973 | 14.1 C | -0.03 C |
| 1974 | 13.9 C | -0.28 C |
| 1975 | 14.1 C | -0.09 C |
| 1976 | 12.8 C | -1.39 C |
| 1977 | 13.6 C | -0.60 C |
| 1978 | 12.9 C | -1.32 C |
| 1980 | 13.7 C | -0.50 C |
| 1981 | 13.5 C | -0.68 C |
| 1983 | 13.6 C | -0.54 C |
| 1984 | 13.8 C | -0.37 C |
| 1985 | 13.9 C | -0.31 C |
| 1986 | 14.5 C | +0.32 C |
| 1987 | 14.6 C | +0.39 C |
| 1988 | 13.6 C | -0.57 C |
| 1989 | 12.9 C | -1.28 C |
| 1995 | 13.6 C | -0.56 C |
| 1996 | 13.2 C | -0.97 C |
| 1997 | 13.0 C | -1.17 C |
| 1998 | 15.0 C | +0.86 C |
| 1999 | 15.3 C | +1.11 C |
| 2000 | 14.8 C | +0.60 C |
| 2001 | 15.1 C | +0.97 C |
| 2002 | 15.5 C | +1.34 C |
| 2004 | 15.9 C | +1.74 C |
| 2009 | 15.1 C | +0.91 C |
| 2010 | 15.0 C | +0.79 C |
| 2011 | 15.6 C | +1.38 C |
| 2012 | 16.5 C | +2.31 C |
| 2013 | 14.7 C | +0.48 C |
| 2014 | 14.4 C | +0.27 C |
| 2015 | 15.7 C | +1.55 C |
| 2016 | 16.5 C | +2.29 C |
| 2017 | 16.5 C | +2.35 C |
| 2018 | 15.9 C | +1.73 C |
| 2019 | 16.1 C | +1.91 C |
| 2020 | 15.9 C | +1.70 C |
| 2021 | 15.8 C | +1.65 C |
| 2022 | 15.7 C | +1.50 C |
| 2023 | 16.3 C | +2.16 C |
| 2024 | 16.8 C | +2.61 C |
| 2025 | 16.1 C | +1.88 C |
The annual mean temperature here has risen by 0.3 C (0.3 to 0.4) per decade over 1935 to 2025. In Fahrenheit: 0.6 F (0.5 to 0.7) per decade. The slope is a straight line fitted to 77 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.3 C (0.3 to 0.4) per decade | 0.6 F (0.5 to 0.7) per decade | 1935 to 2025 | 77 | Rise |
| Mean daily maximum | 0.2 C (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.6) per decade | 1935 to 2025 | 77 | Rise |
| Mean daily minimum | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.6 to 0.9) per decade | 1935 to 2025 | 77 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1934 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 42.2 C (108.0 F) | 1952 | 36.1 C (97.0 F) | 92 |
| Coldest night (TNn) | -29.4 C (-20.9 F) | 1951 | -18.9 C (-2.0 F) | 92 |
| Wettest day (Rx1day) | 172.7 mm (6.8 in) | 1984 | 74.3 mm (2.9 in) | 92 |
| Wettest five days (Rx5day) | 256.2 mm (10.1 in) | 2025 | 115.1 mm (4.5 in) | 92 |
| Longest dry spell (CDD) | 36 days | 1968 | 18 days | 92 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1934 | 38.3 C (100.9 F) |
| 1935 | 36.7 C (98.1 F) |
| 1936 | 40.6 C (105.1 F) |
| 1937 | 35.0 C (95.0 F) |
| 1938 | 35.6 C (96.1 F) |
| 1939 | 37.8 C (100.0 F) |
| 1940 | 36.7 C (98.1 F) |
| 1941 | 36.7 C (98.1 F) |
| 1942 | 37.8 C (100.0 F) |
| 1943 | 40.0 C (104.0 F) |
| 1944 | 38.3 C (100.9 F) |
| 1945 | 37.2 C (99.0 F) |
| 1946 | 34.4 C (93.9 F) |
| 1947 | 35.6 C (96.1 F) |
| 1948 | 36.1 C (97.0 F) |
| 1949 | 35.6 C (96.1 F) |
| 1950 | 33.3 C (91.9 F) |
| 1951 | 36.1 C (97.0 F) |
| 1952 | 42.2 C (108.0 F) |
| 1953 | 40.0 C (104.0 F) |
| 1954 | 41.1 C (106.0 F) |
| 1955 | 36.1 C (97.0 F) |
| 1956 | 36.1 C (97.0 F) |
| 1957 | 36.1 C (97.0 F) |
| 1958 | 33.3 C (91.9 F) |
| 1959 | 34.4 C (93.9 F) |
| 1960 | 35.0 C (95.0 F) |
| 1961 | 31.7 C (89.1 F) |
| 1962 | 37.8 C (100.0 F) |
| 1963 | 34.4 C (93.9 F) |
| 1964 | 36.7 C (98.1 F) |
| 1965 | 35.0 C (95.0 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 33.3 C (91.9 F) |
| 1968 | 35.0 C (95.0 F) |
| 1969 | 36.1 C (97.0 F) |
| 1970 | 35.6 C (96.1 F) |
| 1971 | 35.6 C (96.1 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 32.8 C (91.0 F) |
| 1975 | 35.6 C (96.1 F) |
| 1976 | 34.4 C (93.9 F) |
| 1977 | 35.6 C (96.1 F) |
| 1978 | 35.6 C (96.1 F) |
| 1979 | 34.4 C (93.9 F) |
| 1980 | 38.9 C (102.0 F) |
| 1981 | 35.6 C (96.1 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 40.0 C (104.0 F) |
| 1984 | 35.0 C (95.0 F) |
| 1985 | 34.4 C (93.9 F) |
| 1986 | 37.8 C (100.0 F) |
| 1987 | 36.1 C (97.0 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 34.4 C (93.9 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 36.1 C (97.0 F) |
| 1992 | 33.9 C (93.0 F) |
| 1993 | 37.2 C (99.0 F) |
| 1994 | 37.2 C (99.0 F) |
| 1995 | 38.3 C (100.9 F) |
| 1996 | 37.8 C (100.0 F) |
| 1997 | 37.8 C (100.0 F) |
| 1998 | 36.1 C (97.0 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 37.2 C (99.0 F) |
| 2001 | 35.0 C (95.0 F) |
| 2002 | 37.8 C (100.0 F) |
| 2003 | 35.0 C (95.0 F) |
| 2004 | 35.6 C (96.1 F) |
| 2005 | 37.2 C (99.0 F) |
| 2006 | 34.4 C (93.9 F) |
| 2008 | 36.1 C (97.0 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 39.4 C (102.9 F) |
| 2011 | 38.3 C (100.9 F) |
| 2012 | 42.2 C (108.0 F) |
| 2013 | 35.0 C (95.0 F) |
| 2014 | 35.6 C (96.1 F) |
| 2015 | 36.1 C (97.0 F) |
| 2016 | 36.7 C (98.1 F) |
| 2017 | 37.2 C (99.0 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 37.2 C (99.0 F) |
| 2020 | 36.1 C (97.0 F) |
| 2021 | 36.7 C (98.1 F) |
| 2022 | 38.3 C (100.9 F) |
| 2023 | 37.2 C (99.0 F) |
| 2024 | 38.9 C (102.0 F) |
| 2025 | 37.2 C (99.0 F) |
| 2026 | 38.9 C (102.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1934 | -11.1 C (12.0 F) |
| 1935 | -20.0 C (-4.0 F) |
| 1936 | -23.3 C (-9.9 F) |
| 1937 | -16.1 C (3.0 F) |
| 1938 | -19.4 C (-2.9 F) |
| 1939 | -13.3 C (8.1 F) |
| 1940 | -25.6 C (-14.1 F) |
| 1941 | -13.9 C (7.0 F) |
| 1942 | -26.7 C (-16.1 F) |
| 1943 | -17.8 C (0.0 F) |
| 1944 | -17.8 C (0.0 F) |
| 1945 | -20.0 C (-4.0 F) |
| 1946 | -17.2 C (1.0 F) |
| 1947 | -18.9 C (-2.0 F) |
| 1948 | -22.2 C (-8.0 F) |
| 1949 | -15.6 C (3.9 F) |
| 1950 | -22.2 C (-8.0 F) |
| 1951 | -29.4 C (-20.9 F) |
| 1952 | -16.7 C (1.9 F) |
| 1953 | -18.9 C (-2.0 F) |
| 1954 | -20.6 C (-5.1 F) |
| 1955 | -20.6 C (-5.1 F) |
| 1956 | -13.9 C (7.0 F) |
| 1957 | -18.9 C (-2.0 F) |
| 1958 | -23.3 C (-9.9 F) |
| 1959 | -18.9 C (-2.0 F) |
| 1960 | -21.1 C (-6.0 F) |
| 1961 | -22.8 C (-9.0 F) |
| 1962 | -24.4 C (-11.9 F) |
| 1963 | -28.9 C (-20.0 F) |
| 1964 | -17.8 C (0.0 F) |
| 1965 | -23.3 C (-9.9 F) |
| 1966 | -24.4 C (-11.9 F) |
| 1967 | -20.6 C (-5.1 F) |
| 1968 | -19.4 C (-2.9 F) |
| 1969 | -21.1 C (-6.0 F) |
| 1970 | -24.4 C (-11.9 F) |
| 1971 | -21.1 C (-6.0 F) |
| 1972 | -22.2 C (-8.0 F) |
| 1973 | -16.7 C (1.9 F) |
| 1974 | -13.9 C (7.0 F) |
| 1975 | -13.9 C (7.0 F) |
| 1976 | -21.7 C (-7.1 F) |
| 1977 | -27.2 C (-17.0 F) |
| 1978 | -20.6 C (-5.1 F) |
| 1979 | -20.0 C (-4.0 F) |
| 1980 | -18.3 C (-0.9 F) |
| 1981 | -21.7 C (-7.1 F) |
| 1982 | -28.3 C (-18.9 F) |
| 1983 | -22.8 C (-9.0 F) |
| 1984 | -28.9 C (-20.0 F) |
| 1985 | -27.8 C (-18.0 F) |
| 1986 | -18.9 C (-2.0 F) |
| 1987 | -18.3 C (-0.9 F) |
| 1988 | -18.3 C (-0.9 F) |
| 1989 | -27.8 C (-18.0 F) |
| 1990 | -14.4 C (6.1 F) |
| 1991 | -16.7 C (1.9 F) |
| 1992 | -16.1 C (3.0 F) |
| 1993 | -16.7 C (1.9 F) |
| 1994 | -27.2 C (-17.0 F) |
| 1995 | -18.9 C (-2.0 F) |
| 1996 | -23.3 C (-9.9 F) |
| 1997 | -21.7 C (-7.1 F) |
| 1998 | -13.3 C (8.1 F) |
| 1999 | -17.8 C (0.0 F) |
| 2000 | -16.7 C (1.9 F) |
| 2001 | -15.6 C (3.9 F) |
| 2002 | -12.2 C (10.0 F) |
| 2003 | -21.1 C (-6.0 F) |
| 2004 | -13.9 C (7.0 F) |
| 2005 | -13.3 C (8.1 F) |
| 2006 | -6.7 C (19.9 F) |
| 2008 | -15.0 C (5.0 F) |
| 2009 | -18.9 C (-2.0 F) |
| 2010 | -17.2 C (1.0 F) |
| 2011 | -15.6 C (3.9 F) |
| 2012 | -10.6 C (12.9 F) |
| 2013 | -11.7 C (10.9 F) |
| 2014 | -19.4 C (-2.9 F) |
| 2015 | -20.6 C (-5.1 F) |
| 2016 | -14.4 C (6.1 F) |
| 2017 | -15.6 C (3.9 F) |
| 2018 | -18.3 C (-0.9 F) |
| 2019 | -12.8 C (9.0 F) |
| 2020 | -11.7 C (10.9 F) |
| 2021 | -14.4 C (6.1 F) |
| 2022 | -21.1 C (-6.0 F) |
| 2023 | -8.3 C (17.1 F) |
| 2024 | -18.9 C (-2.0 F) |
| 2025 | -18.3 C (-0.9 F) |
| 2026 | -16.1 C (3.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1934 | 75.7 mm (3.0 in) |
| 1935 | 88.6 mm (3.5 in) |
| 1936 | 72.4 mm (2.9 in) |
| 1937 | 66.8 mm (2.6 in) |
| 1938 | 79.2 mm (3.1 in) |
| 1939 | 84.1 mm (3.3 in) |
| 1940 | 68.6 mm (2.7 in) |
| 1941 | 124.0 mm (4.9 in) |
| 1942 | 100.8 mm (4.0 in) |
| 1943 | 91.2 mm (3.6 in) |
| 1944 | 60.2 mm (2.4 in) |
| 1945 | 73.9 mm (2.9 in) |
| 1946 | 68.6 mm (2.7 in) |
| 1947 | 63.2 mm (2.5 in) |
| 1948 | 92.5 mm (3.6 in) |
| 1949 | 98.6 mm (3.9 in) |
| 1950 | 66.8 mm (2.6 in) |
| 1951 | 68.1 mm (2.7 in) |
| 1952 | 97.8 mm (3.9 in) |
| 1953 | 55.9 mm (2.2 in) |
| 1954 | 59.9 mm (2.4 in) |
| 1955 | 100.3 mm (3.9 in) |
| 1956 | 84.1 mm (3.3 in) |
| 1957 | 169.2 mm (6.7 in) |
| 1958 | 94.7 mm (3.7 in) |
| 1959 | 66.0 mm (2.6 in) |
| 1960 | 71.1 mm (2.8 in) |
| 1961 | 77.7 mm (3.1 in) |
| 1962 | 81.5 mm (3.2 in) |
| 1963 | 60.5 mm (2.4 in) |
| 1964 | 73.7 mm (2.9 in) |
| 1965 | 67.1 mm (2.6 in) |
| 1966 | 61.0 mm (2.4 in) |
| 1967 | 90.2 mm (3.6 in) |
| 1968 | 90.2 mm (3.6 in) |
| 1969 | 83.8 mm (3.3 in) |
| 1970 | 77.5 mm (3.1 in) |
| 1971 | 43.4 mm (1.7 in) |
| 1972 | 76.7 mm (3.0 in) |
| 1973 | 84.8 mm (3.3 in) |
| 1974 | 78.7 mm (3.1 in) |
| 1975 | 93.5 mm (3.7 in) |
| 1976 | 73.7 mm (2.9 in) |
| 1977 | 71.4 mm (2.8 in) |
| 1978 | 101.6 mm (4.0 in) |
| 1979 | 111.8 mm (4.4 in) |
| 1980 | 61.0 mm (2.4 in) |
| 1981 | 70.9 mm (2.8 in) |
| 1982 | 71.6 mm (2.8 in) |
| 1983 | 109.2 mm (4.3 in) |
| 1984 | 172.7 mm (6.8 in) |
| 1985 | 67.3 mm (2.6 in) |
| 1986 | 87.4 mm (3.4 in) |
| 1987 | 69.1 mm (2.7 in) |
| 1988 | 73.7 mm (2.9 in) |
| 1989 | 81.0 mm (3.2 in) |
| 1990 | 47.0 mm (1.9 in) |
| 1991 | 63.5 mm (2.5 in) |
| 1992 | 67.6 mm (2.7 in) |
| 1993 | 45.0 mm (1.8 in) |
| 1994 | 55.9 mm (2.2 in) |
| 1995 | 74.9 mm (2.9 in) |
| 1996 | 50.8 mm (2.0 in) |
| 1997 | 114.3 mm (4.5 in) |
| 1998 | 50.0 mm (2.0 in) |
| 1999 | 74.7 mm (2.9 in) |
| 2000 | 49.0 mm (1.9 in) |
| 2001 | 53.6 mm (2.1 in) |
| 2002 | 82.0 mm (3.2 in) |
| 2003 | 98.0 mm (3.9 in) |
| 2004 | 79.0 mm (3.1 in) |
| 2005 | 92.2 mm (3.6 in) |
| 2006 | 52.1 mm (2.1 in) |
| 2008 | 67.1 mm (2.6 in) |
| 2009 | 62.0 mm (2.4 in) |
| 2010 | 124.2 mm (4.9 in) |
| 2011 | 76.7 mm (3.0 in) |
| 2012 | 60.5 mm (2.4 in) |
| 2013 | 63.0 mm (2.5 in) |
| 2014 | 69.9 mm (2.8 in) |
| 2015 | 53.8 mm (2.1 in) |
| 2016 | 91.2 mm (3.6 in) |
| 2017 | 163.8 mm (6.4 in) |
| 2018 | 57.2 mm (2.3 in) |
| 2019 | 58.9 mm (2.3 in) |
| 2020 | 83.3 mm (3.3 in) |
| 2021 | 81.8 mm (3.2 in) |
| 2022 | 63.2 mm (2.5 in) |
| 2023 | 77.0 mm (3.0 in) |
| 2024 | 67.6 mm (2.7 in) |
| 2025 | 98.0 mm (3.9 in) |
| 2026 | 103.9 mm (4.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1934 | 111.5 mm (4.4 in) |
| 1935 | 174.4 mm (6.9 in) |
| 1936 | 98.1 mm (3.9 in) |
| 1937 | 223.9 mm (8.8 in) |
| 1938 | 151.6 mm (6.0 in) |
| 1939 | 114.6 mm (4.5 in) |
| 1940 | 83.6 mm (3.3 in) |
| 1941 | 124.0 mm (4.9 in) |
| 1942 | 114.2 mm (4.5 in) |
| 1943 | 107.7 mm (4.2 in) |
| 1944 | 120.1 mm (4.7 in) |
| 1945 | 107.4 mm (4.2 in) |
| 1946 | 84.1 mm (3.3 in) |
| 1947 | 86.1 mm (3.4 in) |
| 1948 | 173.3 mm (6.8 in) |
| 1949 | 192.9 mm (7.6 in) |
| 1950 | 138.0 mm (5.4 in) |
| 1951 | 140.5 mm (5.5 in) |
| 1952 | 110.8 mm (4.4 in) |
| 1953 | 91.7 mm (3.6 in) |
| 1954 | 103.1 mm (4.1 in) |
| 1955 | 112.3 mm (4.4 in) |
| 1956 | 178.0 mm (7.0 in) |
| 1957 | 228.4 mm (9.0 in) |
| 1958 | 127.5 mm (5.0 in) |
| 1959 | 85.9 mm (3.4 in) |
| 1960 | 103.9 mm (4.1 in) |
| 1961 | 100.3 mm (3.9 in) |
| 1962 | 197.9 mm (7.8 in) |
| 1963 | 82.1 mm (3.2 in) |
| 1964 | 186.3 mm (7.3 in) |
| 1965 | 120.9 mm (4.8 in) |
| 1966 | 129.3 mm (5.1 in) |
| 1967 | 113.8 mm (4.5 in) |
| 1968 | 129.4 mm (5.1 in) |
| 1969 | 114.0 mm (4.5 in) |
| 1970 | 102.2 mm (4.0 in) |
| 1971 | 85.6 mm (3.4 in) |
| 1972 | 113.3 mm (4.5 in) |
| 1973 | 132.1 mm (5.2 in) |
| 1974 | 154.1 mm (6.1 in) |
| 1975 | 157.9 mm (6.2 in) |
| 1976 | 95.5 mm (3.8 in) |
| 1977 | 91.9 mm (3.6 in) |
| 1978 | 178.3 mm (7.0 in) |
| 1979 | 142.7 mm (5.6 in) |
| 1980 | 83.1 mm (3.3 in) |
| 1981 | 104.9 mm (4.1 in) |
| 1982 | 107.2 mm (4.2 in) |
| 1983 | 207.7 mm (8.2 in) |
| 1984 | 255.7 mm (10.1 in) |
| 1985 | 67.3 mm (2.6 in) |
| 1986 | 146.8 mm (5.8 in) |
| 1987 | 149.9 mm (5.9 in) |
| 1988 | 121.5 mm (4.8 in) |
| 1989 | 191.3 mm (7.5 in) |
| 1990 | 70.6 mm (2.8 in) |
| 1991 | 130.8 mm (5.1 in) |
| 1992 | 105.4 mm (4.1 in) |
| 1993 | 90.0 mm (3.5 in) |
| 1994 | 115.5 mm (4.5 in) |
| 1995 | 136.4 mm (5.4 in) |
| 1996 | 96.3 mm (3.8 in) |
| 1997 | 235.7 mm (9.3 in) |
| 1998 | 78.2 mm (3.1 in) |
| 1999 | 74.9 mm (2.9 in) |
| 2000 | 117.9 mm (4.6 in) |
| 2001 | 88.9 mm (3.5 in) |
| 2002 | 126.7 mm (5.0 in) |
| 2003 | 98.0 mm (3.9 in) |
| 2004 | 102.9 mm (4.1 in) |
| 2005 | 174.8 mm (6.9 in) |
| 2006 | 65.3 mm (2.6 in) |
| 2008 | 86.7 mm (3.4 in) |
| 2009 | 108.4 mm (4.3 in) |
| 2010 | 221.8 mm (8.7 in) |
| 2011 | 138.7 mm (5.5 in) |
| 2012 | 90.5 mm (3.6 in) |
| 2013 | 128.3 mm (5.1 in) |
| 2014 | 110.5 mm (4.4 in) |
| 2015 | 117.6 mm (4.6 in) |
| 2016 | 223.8 mm (8.8 in) |
| 2017 | 206.4 mm (8.1 in) |
| 2018 | 109.0 mm (4.3 in) |
| 2019 | 151.8 mm (6.0 in) |
| 2020 | 111.0 mm (4.4 in) |
| 2021 | 174.8 mm (6.9 in) |
| 2022 | 107.4 mm (4.2 in) |
| 2023 | 101.1 mm (4.0 in) |
| 2024 | 168.9 mm (6.6 in) |
| 2025 | 256.2 mm (10.1 in) |
| 2026 | 149.9 mm (5.9 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1934 | 20 days |
| 1935 | 20 days |
| 1936 | 27 days |
| 1937 | 15 days |
| 1938 | 33 days |
| 1939 | 25 days |
| 1940 | 14 days |
| 1941 | 25 days |
| 1942 | 23 days |
| 1943 | 27 days |
| 1944 | 20 days |
| 1945 | 16 days |
| 1946 | 22 days |
| 1947 | 20 days |
| 1948 | 21 days |
| 1949 | 12 days |
| 1950 | 19 days |
| 1951 | 15 days |
| 1952 | 23 days |
| 1953 | 31 days |
| 1954 | 19 days |
| 1955 | 31 days |
| 1956 | 26 days |
| 1957 | 23 days |
| 1958 | 17 days |
| 1959 | 19 days |
| 1960 | 15 days |
| 1961 | 12 days |
| 1962 | 18 days |
| 1963 | 32 days |
| 1964 | 24 days |
| 1965 | 15 days |
| 1966 | 15 days |
| 1967 | 18 days |
| 1968 | 36 days |
| 1969 | 18 days |
| 1970 | 10 days |
| 1971 | 12 days |
| 1972 | 20 days |
| 1973 | 22 days |
| 1974 | 15 days |
| 1975 | 25 days |
| 1976 | 15 days |
| 1977 | 18 days |
| 1978 | 13 days |
| 1979 | 15 days |
| 1980 | 17 days |
| 1981 | 14 days |
| 1982 | 13 days |
| 1983 | 23 days |
| 1984 | 21 days |
| 1985 | 15 days |
| 1986 | 17 days |
| 1987 | 20 days |
| 1988 | 21 days |
| 1989 | 18 days |
| 1990 | 14 days |
| 1991 | 20 days |
| 1992 | 28 days |
| 1993 | 12 days |
| 1994 | 14 days |
| 1995 | 14 days |
| 1996 | 14 days |
| 1997 | 18 days |
| 1998 | 22 days |
| 1999 | 24 days |
| 2000 | 16 days |
| 2001 | 15 days |
| 2002 | 18 days |
| 2003 | 17 days |
| 2004 | 22 days |
| 2005 | 14 days |
| 2006 | 7 days |
| 2008 | 14 days |
| 2009 | 16 days |
| 2010 | 17 days |
| 2011 | 16 days |
| 2012 | 29 days |
| 2013 | 14 days |
| 2014 | 16 days |
| 2015 | 19 days |
| 2016 | 20 days |
| 2017 | 18 days |
| 2018 | 15 days |
| 2019 | 25 days |
| 2020 | 14 days |
| 2021 | 12 days |
| 2022 | 30 days |
| 2023 | 18 days |
| 2024 | 26 days |
| 2025 | 19 days |
| 2026 | 17 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
77 years with a frostAcross 77 years with a frost, the median last spring frost at Mammoth Cave falls on 22 April and the median first autumn frost on 17 October, which leaves a median of 175 days between them.
In 1986 to 2025 the median growing season was 189 days. That is 23 days more than in 1935 to 1966.
Fitted over all years, the growing season changes by +4.6 days per decade at this station.
| Measure | Median, all years | Earliest period (1935 to 1966) | Recent period (1986 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 22 April | 26 April | 19 April | 7 days earlier | -2.0 days per decade |
| First autumn frost | 17 October | 12 October | 25 October | 13 days later | +2.6 days per decade |
| Growing days | 175 days | 166 days | 189 days | 23 days more | +4.6 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
81 years, 1935 to 2025A day with at least 74.6 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 166.4 mm (6.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 74.6 mm (2.9 in) | |
| 5 years | 94.7 mm (3.7 in) | |
| 10 years | 109.6 mm (4.3 in) | |
| 25 years | 130.5 mm (5.1 in) | |
| 50 years | 147.7 mm (5.8 in) | |
| 100 years | 166.4 mm (6.6 in) | Longer than the 81 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 81 years of values from 1935 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 172.7 mm (6.8 in) in 1984; 169.2 mm (6.7 in) in 1957; 163.8 mm (6.4 in) in 2017.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Mammoth Cave, at 1989 and 2000. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1989 ran 0.4 C (0.7 F) lower than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2000 ran 1.0 C (1.8 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1989 | -0.4 | -0.7 | possible | 5 |
| 2000 | +1.0 | +1.8 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Mammoth Cave had a mean temperature of 15.9 C (60.6 F) and 1,475.6 mm (58.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Huntsville Intnl AP (United States, 283 km away), Water Valley (United States, 456 km away) and Batesville (United States, 465 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Huntsville Intnl AP | United States | 283 km (176 mi) | 15.8 C (60.5 F) | 1,452.9 mm (57.2 in) | 0.45 |
| Water Valley | United States | 456 km (283 mi) | 15.9 C (60.7 F) | 1,462.0 mm (57.6 in) | 0.50 |
| Batesville | United States | 465 km (289 mi) | 15.9 C (60.6 F) | 1,444.4 mm (56.9 in) | 0.51 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).