Chattanooga AP Weather Records (USW00013882)
Record envelope, standing records and threshold days for Chattanooga AP (USW00013882), Tennessee, United States, with 89 years of record.
Key Facts for Chattanooga AP
- Chattanooga AP (USW00013882) is a weather station in Tennessee, United States at 35.03 latitude and -85.20 longitude, 204 m (669 ft) above sea level.
- The station reports from 1938 to 2026, 89 years of record.
- 1,464 records set at Chattanooga AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Chattanooga AP set a daily record high maximum temperature of 32.2 C (90.0 F) on 13 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Tennessee, United States, 35.03 latitude, -85.20 longitude.
- Elevation: 204 m (669 ft).
- Period of record: 1938 to 2026, 89 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
19 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 25.6 C (78.1 F) | -25.0 C (-13.0 F) | 21.7 C (71.1 F) | -11.7 C (10.9 F) |
| Feb | 27.8 C (82.0 F) | -17.2 C (1.0 F) | 25.6 C (78.1 F) | -8.9 C (16.0 F) |
| Mar | 31.1 C (88.0 F) | -13.3 C (8.1 F) | 30.6 C (87.1 F) | -2.8 C (27.0 F) |
| Apr | 33.9 C (93.0 F) | -3.9 C (25.0 F) | 31.1 C (88.0 F) | 5.0 C (41.0 F) |
| May | 37.2 C (99.0 F) | 1.1 C (34.0 F) | 32.8 C (91.0 F) | 6.7 C (44.1 F) |
| Jun | 41.7 C (107.1 F) | 5.0 C (41.0 F) | 36.7 C (98.1 F) | 13.9 C (57.0 F) |
| Jul | 41.7 C (107.1 F) | 10.6 C (51.1 F) | 37.8 C (100.0 F) | 19.4 C (66.9 F) |
| Aug | 40.6 C (105.1 F) | 10.0 C (50.0 F) | 37.2 C (99.0 F) | 18.3 C (64.9 F) |
| Sep | 39.4 C (102.9 F) | 2.2 C (36.0 F) | 38.3 C (100.9 F) | 10.6 C (51.1 F) |
| Oct | 37.8 C (100.0 F) | -5.6 C (21.9 F) | 32.2 C (90.0 F) | 12.8 C (55.0 F) |
| Nov | 30.0 C (86.0 F) | -15.6 C (3.9 F) | n/a | n/a |
| Dec | 25.6 C (78.1 F) | -18.9 C (-2.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1938 | 15 |
| 1939 | 21 |
| 1940 | 41 |
| 1941 | 16 |
| 1942 | 14 |
| 1943 | 27 |
| 1944 | 15 |
| 1945 | 14 |
| 1946 | 12 |
| 1947 | 19 |
| 1948 | 19 |
| 1949 | 15 |
| 1950 | 32 |
| 1951 | 27 |
| 1952 | 32 |
| 1953 | 13 |
| 1954 | 33 |
| 1955 | 18 |
| 1956 | 17 |
| 1957 | 10 |
| 1958 | 13 |
| 1959 | 12 |
| 1960 | 21 |
| 1961 | 18 |
| 1962 | 25 |
| 1963 | 26 |
| 1964 | 14 |
| 1965 | 14 |
| 1966 | 12 |
| 1967 | 35 |
| 1968 | 16 |
| 1969 | 10 |
| 1970 | 18 |
| 1971 | 14 |
| 1972 | 23 |
| 1973 | 9 |
| 1974 | 31 |
| 1975 | 9 |
| 1976 | 15 |
| 1977 | 24 |
| 1978 | 11 |
| 1979 | 12 |
| 1980 | 27 |
| 1981 | 12 |
| 1982 | 16 |
| 1983 | 21 |
| 1984 | 16 |
| 1985 | 23 |
| 1986 | 10 |
| 1987 | 8 |
| 1988 | 15 |
| 1989 | 24 |
| 1990 | 7 |
| 1991 | 14 |
| 1992 | 17 |
| 1993 | 13 |
| 1994 | 4 |
| 1995 | 7 |
| 1996 | 15 |
| 1997 | 12 |
| 1998 | 17 |
| 1999 | 14 |
| 2000 | 9 |
| 2001 | 5 |
| 2002 | 19 |
| 2003 | 3 |
| 2004 | 8 |
| 2005 | 7 |
| 2006 | 13 |
| 2007 | 22 |
| 2008 | 5 |
| 2009 | 8 |
| 2010 | 28 |
| 2011 | 20 |
| 2012 | 16 |
| 2013 | 7 |
| 2014 | 12 |
| 2015 | 13 |
| 2016 | 17 |
| 2017 | 20 |
| 2018 | 17 |
| 2019 | 31 |
| 2020 | 16 |
| 2021 | 6 |
| 2022 | 12 |
| 2023 | 12 |
| 2024 | 17 |
| 2025 | 19 |
| 2026 | 18 |
All-Time Record Progression
10 new records| Date | Kind | Detail |
|---|---|---|
| 1968-08-25 | Record high minimum temperature | Record high minimum temperature 26.7 C (80.1 F) |
| 1977-09-07 | Record daily precipitation | Record daily precipitation 161.8 mm (6.4 in) |
| 1980-07-11 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 1988-01-07 | Record daily snowfall | Record daily snowfall 25.9 cm (10.2 in) |
| 1988-01-08 | Record snow depth | Record snow depth 20.3 cm (8.0 in) |
| 1993-03-13 | Record daily snowfall | Record daily snowfall 47.0 cm (18.5 in) |
| 1993-03-13 | Record snow depth | Record snow depth 25.4 cm (10.0 in) |
| 1993-03-14 | Record snow depth | Record snow depth 48.3 cm (19.0 in) |
| 2011-09-05 | Record daily precipitation | Record daily precipitation 241.0 mm (9.5 in) |
| 2012-06-30 | Record high maximum temperature | Record high maximum temperature 41.7 C (107.1 F) |
Wettest Day of Each Month
Sep: 241.0 mm (9.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 96.3 mm (3.8 in) | 6 January 2009 |
| Feb | 88.4 mm (3.5 in) | 28 February 2018 |
| Mar | 157.2 mm (6.2 in) | 27 March 1994 |
| Apr | 93.5 mm (3.7 in) | 8 April 1938 |
| May | 86.6 mm (3.4 in) | 2 May 1964 |
| Jun | 123.2 mm (4.9 in) | 15 June 1949 |
| Jul | 117.9 mm (4.6 in) | 20 July 1979 |
| Aug | 163.1 mm (6.4 in) | 12 August 2025 |
| Sep | 241.0 mm (9.5 in) | 5 September 2011 |
| Oct | 92.7 mm (3.6 in) | 8 October 2017 |
| Nov | 115.1 mm (4.5 in) | 28 November 1948 |
| Dec | 123.2 mm (4.9 in) | 28 December 1942 |
Period of Record Coverage
1938 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1938 | 275 | 75% | No |
| 1939 | 364 | 100% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 363 | 99% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | 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 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 286 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 13 October 2026 | Chattanooga AP, US | daily high max (Provisional) | 32.2 C (90.0 F) | 1.1 C (2.0 F) | 72 years | 31 of 100 (Routine) |
| 4 October 2026 | Chattanooga AP, US | daily high min (Tie, Provisional) | 20.6 C (69.1 F) | tie | 19 years | 3 of 100 (Routine) |
| 22 September 2026 | Chattanooga AP, US | daily high min (Tie, Provisional) | 21.7 C (71.1 F) | tie | 16 years | 3 of 100 (Routine) |
| 20 September 2026 | Chattanooga AP, US | daily high max (Provisional) | 36.1 C (97.0 F) | 0.5 C (0.9 F) | 16 years | 13 of 100 (Routine) |
| 19 September 2026 | Chattanooga AP, US | daily high min (Provisional) | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 24 years | 16 of 100 (Routine) |
| 19 September 2026 | Chattanooga AP, US | daily high max (Provisional) | 36.7 C (98.1 F) | 1.1 C (2.0 F) | 16 years | 14 of 100 (Routine) |
| 18 September 2026 | Chattanooga AP, US | daily high max (Provisional) | 37.8 C (100.0 F) | 2.2 C (4.0 F) | 72 years | 34 of 100 (Routine) |
| 16 September 2026 | Chattanooga AP, US | daily high min (Provisional) | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 16 years | 13 of 100 (Routine) |
| 15 September 2026 | Chattanooga AP, US | daily high max (Tie, Provisional) | 36.1 C (97.0 F) | tie | 35 years | 4 of 100 (Routine) |
| 11 September 2026 | Chattanooga AP, US | daily high max (Provisional) | 36.1 C (97.0 F) | 0.5 C (0.9 F) | 16 years | 13 of 100 (Routine) |
| 5 September 2026 | Chattanooga AP, US | monthly high min (Tie, Provisional) | 24.4 C (75.9 F) | tie | 78 years | 10 of 100 (Routine) |
| 4 September 2026 | Chattanooga AP, US | daily high min (Provisional) | 23.9 C (75.0 F) | 1.1 C (2.0 F) | 44 years | 23 of 100 (Routine) |
| 3 September 2026 | Chattanooga AP, US | daily high min (Provisional) | 23.9 C (75.0 F) | 0.6 C (1.1 F) | 32 years | 18 of 100 (Routine) |
| 3 September 2026 | Chattanooga AP, US | daily high max (Tie, Provisional) | 37.8 C (100.0 F) | tie | 72 years | 7 of 100 (Routine) |
| 2 September 2026 | Chattanooga AP, US | daily high max (Tie, Provisional) | 37.8 C (100.0 F) | tie | 15 years | 3 of 100 (Routine) |
| 15 August 2026 | Chattanooga AP, US | daily high min (Tie) | 24.4 C (75.9 F) | tie | 16 years | 3 of 100 (Routine) |
| 14 August 2026 | Chattanooga AP, US | daily high min (Tie) | 25.0 C (77.0 F) | tie | 16 years | 3 of 100 (Routine) |
| 29 July 2026 | Chattanooga AP, US | daily high min (Tie) | 25.6 C (78.1 F) | tie | 32 years | 4 of 100 (Routine) |
| 28 July 2026 | Chattanooga AP, US | daily high min (Tie) | 25.0 C (77.0 F) | tie | 0 years | 2 of 100 (Routine) |
| 27 July 2026 | Chattanooga AP, US | daily high min | 25.6 C (78.1 F) | 1.2 C (2.2 F) | 32 years | 22 of 100 (Routine) |
Climate Trend
87 complete years, 1939 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1939 | 16.5 C | +0.64 C |
| 1940 | 14.3 C | -1.60 C |
| 1941 | 15.7 C | -0.21 C |
| 1942 | 15.0 C | -0.84 C |
| 1943 | 15.2 C | -0.67 C |
| 1944 | 15.6 C | -0.27 C |
| 1945 | 15.7 C | -0.22 C |
| 1946 | 16.2 C | +0.33 C |
| 1947 | 15.2 C | -0.66 C |
| 1948 | 15.9 C | +0.01 C |
| 1949 | 16.5 C | +0.58 C |
| 1950 | 15.7 C | -0.15 C |
| 1951 | 15.9 C | +0.06 C |
| 1952 | 16.0 C | +0.15 C |
| 1953 | 16.2 C | +0.36 C |
| 1954 | 16.3 C | +0.41 C |
| 1955 | 15.9 C | +0.01 C |
| 1956 | 16.1 C | +0.25 C |
| 1957 | 16.1 C | +0.22 C |
| 1958 | 14.5 C | -1.38 C |
| 1959 | 15.6 C | -0.32 C |
| 1960 | 14.6 C | -1.29 C |
| 1961 | 15.4 C | -0.48 C |
| 1962 | 15.7 C | -0.16 C |
| 1963 | 14.9 C | -0.95 C |
| 1964 | 15.5 C | -0.37 C |
| 1965 | 15.1 C | -0.78 C |
| 1966 | 14.2 C | -1.68 C |
| 1967 | 14.6 C | -1.25 C |
| 1968 | 14.8 C | -1.10 C |
| 1969 | 13.9 C | -1.94 C |
| 1970 | 15.0 C | -0.92 C |
| 1971 | 15.6 C | -0.28 C |
| 1972 | 14.3 C | -1.60 C |
| 1973 | 15.4 C | -0.51 C |
| 1974 | 14.8 C | -1.10 C |
| 1975 | 14.7 C | -1.18 C |
| 1976 | 14.2 C | -1.70 C |
| 1977 | 15.8 C | -0.08 C |
| 1978 | 15.4 C | -0.51 C |
| 1979 | 14.8 C | -1.05 C |
| 1980 | 15.1 C | -0.74 C |
| 1981 | 15.1 C | -0.78 C |
| 1982 | 15.5 C | -0.39 C |
| 1983 | 14.9 C | -1.00 C |
| 1984 | 15.0 C | -0.87 C |
| 1985 | 15.3 C | -0.62 C |
| 1986 | 16.5 C | +0.59 C |
| 1987 | 16.0 C | +0.11 C |
| 1988 | 15.2 C | -0.64 C |
| 1989 | 15.5 C | -0.42 C |
| 1990 | 17.1 C | +1.20 C |
| 1991 | 16.7 C | +0.84 C |
| 1992 | 14.9 C | -0.95 C |
| 1993 | 16.5 C | +0.60 C |
| 1994 | 16.0 C | +0.08 C |
| 1995 | 15.6 C | -0.24 C |
| 1996 | 15.0 C | -0.91 C |
| 1997 | 15.3 C | -0.60 C |
| 1998 | 17.2 C | +1.28 C |
| 1999 | 17.0 C | +1.10 C |
| 2000 | 16.3 C | +0.41 C |
| 2001 | 16.2 C | +0.31 C |
| 2002 | 16.7 C | +0.82 C |
| 2003 | 15.6 C | -0.27 C |
| 2004 | 16.2 C | +0.32 C |
| 2005 | 16.2 C | +0.33 C |
| 2006 | 16.6 C | +0.74 C |
| 2007 | 17.4 C | +1.53 C |
| 2008 | 16.2 C | +0.27 C |
| 2009 | 16.1 C | +0.25 C |
| 2010 | 16.3 C | +0.43 C |
| 2011 | 16.9 C | +1.01 C |
| 2012 | 17.5 C | +1.64 C |
| 2013 | 16.0 C | +0.08 C |
| 2014 | 15.9 C | -0.01 C |
| 2015 | 17.0 C | +1.15 C |
| 2016 | 17.8 C | +1.96 C |
| 2017 | 17.4 C | +1.51 C |
| 2018 | 16.9 C | +0.98 C |
| 2019 | 17.8 C | +1.94 C |
| 2020 | 17.6 C | +1.68 C |
| 2021 | 17.2 C | +1.29 C |
| 2022 | 17.0 C | +1.09 C |
| 2023 | 17.6 C | +1.75 C |
| 2024 | 18.1 C | +2.21 C |
| 2025 | 17.1 C | +1.22 C |
The annual mean temperature here has risen by 0.2 C (0.2 to 0.3) per decade over 1939 to 2025. In Fahrenheit: 0.4 F (0.3 to 0.5) per decade. The slope is a straight line fitted to 87 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.5) per decade | 1939 to 2025 | 87 | Rise |
| Mean daily maximum | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.1 to 0.4) per decade | 1939 to 2025 | 87 | Rise |
| Mean daily minimum | 0.3 C (0.2 to 0.4) per decade | 0.6 F (0.4 to 0.7) per decade | 1939 to 2025 | 87 | 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
1938 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.7 C (107.1 F) | 2012 | 36.7 C (98.1 F) | 89 |
| Coldest night (TNn) | -25.0 C (-13.0 F) | 1940 | -12.2 C (10.0 F) | 89 |
| Wettest day (Rx1day) | 241.0 mm (9.5 in) | 2011 | 78.5 mm (3.1 in) | 89 |
| Wettest five days (Rx5day) | 262.6 mm (10.3 in) | 2011 | 122.2 mm (4.8 in) | 89 |
| Longest dry spell (CDD) | 35 days | 1998 | 19 days | 89 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1938 | 38.3 C (100.9 F) |
| 1939 | 38.9 C (102.0 F) |
| 1940 | 36.1 C (97.0 F) |
| 1941 | 37.2 C (99.0 F) |
| 1942 | 36.7 C (98.1 F) |
| 1943 | 38.3 C (100.9 F) |
| 1944 | 37.8 C (100.0 F) |
| 1945 | 36.7 C (98.1 F) |
| 1946 | 35.6 C (96.1 F) |
| 1947 | 40.6 C (105.1 F) |
| 1948 | 38.3 C (100.9 F) |
| 1949 | 35.6 C (96.1 F) |
| 1950 | 35.6 C (96.1 F) |
| 1951 | 37.8 C (100.0 F) |
| 1952 | 41.1 C (106.0 F) |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 39.4 C (102.9 F) |
| 1955 | 36.7 C (98.1 F) |
| 1956 | 38.9 C (102.0 F) |
| 1957 | 37.8 C (100.0 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 35.6 C (96.1 F) |
| 1961 | 35.0 C (95.0 F) |
| 1962 | 37.8 C (100.0 F) |
| 1963 | 35.6 C (96.1 F) |
| 1964 | 36.1 C (97.0 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 33.9 C (93.0 F) |
| 1968 | 38.9 C (102.0 F) |
| 1969 | 35.6 C (96.1 F) |
| 1970 | 38.9 C (102.0 F) |
| 1971 | 36.1 C (97.0 F) |
| 1972 | 33.9 C (93.0 F) |
| 1973 | 35.6 C (96.1 F) |
| 1974 | 33.3 C (91.9 F) |
| 1975 | 34.4 C (93.9 F) |
| 1976 | 34.4 C (93.9 F) |
| 1977 | 40.0 C (104.0 F) |
| 1978 | 36.7 C (98.1 F) |
| 1979 | 34.4 C (93.9 F) |
| 1980 | 40.6 C (105.1 F) |
| 1981 | 36.7 C (98.1 F) |
| 1982 | 35.6 C (96.1 F) |
| 1983 | 39.4 C (102.9 F) |
| 1984 | 37.2 C (99.0 F) |
| 1985 | 36.1 C (97.0 F) |
| 1986 | 37.8 C (100.0 F) |
| 1987 | 37.8 C (100.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 35.0 C (95.0 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 36.1 C (97.0 F) |
| 1992 | 34.4 C (93.9 F) |
| 1993 | 40.0 C (104.0 F) |
| 1994 | 34.4 C (93.9 F) |
| 1995 | 36.7 C (98.1 F) |
| 1996 | 35.6 C (96.1 F) |
| 1997 | 36.1 C (97.0 F) |
| 1998 | 37.8 C (100.0 F) |
| 1999 | 38.3 C (100.9 F) |
| 2000 | 37.2 C (99.0 F) |
| 2001 | 34.4 C (93.9 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 33.9 C (93.0 F) |
| 2004 | 35.0 C (95.0 F) |
| 2005 | 36.1 C (97.0 F) |
| 2006 | 37.8 C (100.0 F) |
| 2007 | 40.6 C (105.1 F) |
| 2008 | 37.8 C (100.0 F) |
| 2009 | 36.7 C (98.1 F) |
| 2010 | 38.3 C (100.9 F) |
| 2011 | 38.3 C (100.9 F) |
| 2012 | 41.7 C (107.1 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 35.0 C (95.0 F) |
| 2015 | 36.7 C (98.1 F) |
| 2016 | 37.8 C (100.0 F) |
| 2017 | 36.1 C (97.0 F) |
| 2018 | 35.0 C (95.0 F) |
| 2019 | 39.4 C (102.9 F) |
| 2020 | 36.7 C (98.1 F) |
| 2021 | 36.1 C (97.0 F) |
| 2022 | 37.2 C (99.0 F) |
| 2023 | 37.2 C (99.0 F) |
| 2024 | 38.3 C (100.9 F) |
| 2025 | 35.6 C (96.1 F) |
| 2026 | 38.3 C (100.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1938 | -9.4 C (15.1 F) |
| 1939 | -8.9 C (16.0 F) |
| 1940 | -25.0 C (-13.0 F) |
| 1941 | -7.2 C (19.0 F) |
| 1942 | -14.4 C (6.1 F) |
| 1943 | -12.8 C (9.0 F) |
| 1944 | -10.0 C (14.0 F) |
| 1945 | -11.7 C (10.9 F) |
| 1946 | -9.4 C (15.1 F) |
| 1947 | -11.1 C (12.0 F) |
| 1948 | -13.9 C (7.0 F) |
| 1949 | -7.8 C (18.0 F) |
| 1950 | -15.6 C (3.9 F) |
| 1951 | -15.0 C (5.0 F) |
| 1952 | -9.4 C (15.1 F) |
| 1953 | -11.7 C (10.9 F) |
| 1954 | -10.0 C (14.0 F) |
| 1955 | -10.6 C (12.9 F) |
| 1956 | -7.8 C (18.0 F) |
| 1957 | -12.8 C (9.0 F) |
| 1958 | -17.2 C (1.0 F) |
| 1959 | -13.9 C (7.0 F) |
| 1960 | -13.3 C (8.1 F) |
| 1961 | -13.9 C (7.0 F) |
| 1962 | -18.9 C (-2.0 F) |
| 1963 | -21.7 C (-7.1 F) |
| 1964 | -12.2 C (10.0 F) |
| 1965 | -13.3 C (8.1 F) |
| 1966 | -23.3 C (-9.9 F) |
| 1967 | -14.4 C (6.1 F) |
| 1968 | -12.2 C (10.0 F) |
| 1969 | -12.8 C (9.0 F) |
| 1970 | -15.6 C (3.9 F) |
| 1971 | -12.8 C (9.0 F) |
| 1972 | -16.7 C (1.9 F) |
| 1973 | -11.7 C (10.9 F) |
| 1974 | -9.4 C (15.1 F) |
| 1975 | -12.2 C (10.0 F) |
| 1976 | -13.3 C (8.1 F) |
| 1977 | -18.9 C (-2.0 F) |
| 1978 | -13.3 C (8.1 F) |
| 1979 | -12.2 C (10.0 F) |
| 1980 | -12.8 C (9.0 F) |
| 1981 | -13.3 C (8.1 F) |
| 1982 | -18.9 C (-2.0 F) |
| 1983 | -18.9 C (-2.0 F) |
| 1984 | -13.3 C (8.1 F) |
| 1985 | -23.3 C (-9.9 F) |
| 1986 | -14.4 C (6.1 F) |
| 1987 | -9.4 C (15.1 F) |
| 1988 | -13.3 C (8.1 F) |
| 1989 | -15.6 C (3.9 F) |
| 1990 | -7.2 C (19.0 F) |
| 1991 | -11.7 C (10.9 F) |
| 1992 | -11.1 C (12.0 F) |
| 1993 | -11.7 C (10.9 F) |
| 1994 | -16.7 C (1.9 F) |
| 1995 | -11.7 C (10.9 F) |
| 1996 | -16.7 C (1.9 F) |
| 1997 | -12.8 C (9.0 F) |
| 1998 | -7.8 C (18.0 F) |
| 1999 | -10.0 C (14.0 F) |
| 2000 | -9.4 C (15.1 F) |
| 2001 | -10.6 C (12.9 F) |
| 2002 | -7.8 C (18.0 F) |
| 2003 | -13.9 C (7.0 F) |
| 2004 | -8.9 C (16.0 F) |
| 2005 | -8.9 C (16.0 F) |
| 2006 | -8.9 C (16.0 F) |
| 2007 | -8.9 C (16.0 F) |
| 2008 | -10.0 C (14.0 F) |
| 2009 | -12.8 C (9.0 F) |
| 2010 | -10.0 C (14.0 F) |
| 2011 | -10.6 C (12.9 F) |
| 2012 | -7.2 C (19.0 F) |
| 2013 | -6.1 C (21.0 F) |
| 2014 | -14.9 C (5.2 F) |
| 2015 | -13.2 C (8.2 F) |
| 2016 | -8.8 C (16.2 F) |
| 2017 | -9.9 C (14.2 F) |
| 2018 | -13.2 C (8.2 F) |
| 2019 | -7.1 C (19.2 F) |
| 2020 | -7.1 C (19.2 F) |
| 2021 | -6.0 C (21.2 F) |
| 2022 | -13.8 C (7.2 F) |
| 2023 | -4.9 C (23.2 F) |
| 2024 | -11.6 C (11.1 F) |
| 2025 | -11.0 C (12.2 F) |
| 2026 | -11.7 C (10.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1938 | 93.5 mm (3.7 in) |
| 1939 | 45.2 mm (1.8 in) |
| 1940 | 57.2 mm (2.3 in) |
| 1941 | 92.2 mm (3.6 in) |
| 1942 | 123.2 mm (4.9 in) |
| 1943 | 68.3 mm (2.7 in) |
| 1944 | 78.0 mm (3.1 in) |
| 1945 | 69.6 mm (2.7 in) |
| 1946 | 70.1 mm (2.8 in) |
| 1947 | 67.3 mm (2.6 in) |
| 1948 | 115.1 mm (4.5 in) |
| 1949 | 123.2 mm (4.9 in) |
| 1950 | 92.2 mm (3.6 in) |
| 1951 | 112.3 mm (4.4 in) |
| 1952 | 83.6 mm (3.3 in) |
| 1953 | 60.7 mm (2.4 in) |
| 1954 | 69.1 mm (2.7 in) |
| 1955 | 62.0 mm (2.4 in) |
| 1956 | 55.1 mm (2.2 in) |
| 1957 | 99.6 mm (3.9 in) |
| 1958 | 78.7 mm (3.1 in) |
| 1959 | 93.7 mm (3.7 in) |
| 1960 | 85.6 mm (3.4 in) |
| 1961 | 118.1 mm (4.6 in) |
| 1962 | 73.2 mm (2.9 in) |
| 1963 | 94.5 mm (3.7 in) |
| 1964 | 91.4 mm (3.6 in) |
| 1965 | 79.8 mm (3.1 in) |
| 1966 | 66.0 mm (2.6 in) |
| 1967 | 72.4 mm (2.9 in) |
| 1968 | 37.6 mm (1.5 in) |
| 1969 | 88.6 mm (3.5 in) |
| 1970 | 53.8 mm (2.1 in) |
| 1971 | 76.5 mm (3.0 in) |
| 1972 | 78.2 mm (3.1 in) |
| 1973 | 118.9 mm (4.7 in) |
| 1974 | 70.6 mm (2.8 in) |
| 1975 | 91.2 mm (3.6 in) |
| 1976 | 82.0 mm (3.2 in) |
| 1977 | 161.8 mm (6.4 in) |
| 1978 | 62.5 mm (2.5 in) |
| 1979 | 117.9 mm (4.6 in) |
| 1980 | 145.0 mm (5.7 in) |
| 1981 | 49.3 mm (1.9 in) |
| 1982 | 88.9 mm (3.5 in) |
| 1983 | 85.3 mm (3.4 in) |
| 1984 | 49.8 mm (2.0 in) |
| 1985 | 65.5 mm (2.6 in) |
| 1986 | 75.9 mm (3.0 in) |
| 1987 | 78.5 mm (3.1 in) |
| 1988 | 90.7 mm (3.6 in) |
| 1989 | 65.5 mm (2.6 in) |
| 1990 | 89.7 mm (3.5 in) |
| 1991 | 72.6 mm (2.9 in) |
| 1992 | 64.0 mm (2.5 in) |
| 1993 | 51.6 mm (2.0 in) |
| 1994 | 157.2 mm (6.2 in) |
| 1995 | 70.9 mm (2.8 in) |
| 1996 | 73.9 mm (2.9 in) |
| 1997 | 67.1 mm (2.6 in) |
| 1998 | 61.5 mm (2.4 in) |
| 1999 | 69.1 mm (2.7 in) |
| 2000 | 84.3 mm (3.3 in) |
| 2001 | 69.1 mm (2.7 in) |
| 2002 | 48.8 mm (1.9 in) |
| 2003 | 83.3 mm (3.3 in) |
| 2004 | 133.1 mm (5.2 in) |
| 2005 | 53.3 mm (2.1 in) |
| 2006 | 51.6 mm (2.0 in) |
| 2007 | 69.6 mm (2.7 in) |
| 2008 | 83.3 mm (3.3 in) |
| 2009 | 96.3 mm (3.8 in) |
| 2010 | 67.1 mm (2.6 in) |
| 2011 | 241.0 mm (9.5 in) |
| 2012 | 92.7 mm (3.6 in) |
| 2013 | 80.5 mm (3.2 in) |
| 2014 | 56.9 mm (2.2 in) |
| 2015 | 105.2 mm (4.1 in) |
| 2016 | 101.9 mm (4.0 in) |
| 2017 | 92.7 mm (3.6 in) |
| 2018 | 88.4 mm (3.5 in) |
| 2019 | 83.1 mm (3.3 in) |
| 2020 | 99.3 mm (3.9 in) |
| 2021 | 70.4 mm (2.8 in) |
| 2022 | 69.1 mm (2.7 in) |
| 2023 | 70.4 mm (2.8 in) |
| 2024 | 86.9 mm (3.4 in) |
| 2025 | 163.1 mm (6.4 in) |
| 2026 | 41.7 mm (1.6 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1938 | 99.4 mm (3.9 in) |
| 1939 | 118.8 mm (4.7 in) |
| 1940 | 89.5 mm (3.5 in) |
| 1941 | 174.7 mm (6.9 in) |
| 1942 | 186.2 mm (7.3 in) |
| 1943 | 156.5 mm (6.2 in) |
| 1944 | 99.9 mm (3.9 in) |
| 1945 | 90.9 mm (3.6 in) |
| 1946 | 150.2 mm (5.9 in) |
| 1947 | 174.2 mm (6.9 in) |
| 1948 | 161.1 mm (6.3 in) |
| 1949 | 163.3 mm (6.4 in) |
| 1950 | 154.2 mm (6.1 in) |
| 1951 | 135.9 mm (5.4 in) |
| 1952 | 95.0 mm (3.7 in) |
| 1953 | 94.2 mm (3.7 in) |
| 1954 | 138.9 mm (5.5 in) |
| 1955 | 110.7 mm (4.4 in) |
| 1956 | 135.3 mm (5.3 in) |
| 1957 | 204.5 mm (8.1 in) |
| 1958 | 86.8 mm (3.4 in) |
| 1959 | 102.1 mm (4.0 in) |
| 1960 | 87.7 mm (3.5 in) |
| 1961 | 159.2 mm (6.3 in) |
| 1962 | 189.6 mm (7.5 in) |
| 1963 | 153.4 mm (6.0 in) |
| 1964 | 120.4 mm (4.7 in) |
| 1965 | 147.5 mm (5.8 in) |
| 1966 | 96.0 mm (3.8 in) |
| 1967 | 153.1 mm (6.0 in) |
| 1968 | 77.7 mm (3.1 in) |
| 1969 | 116.3 mm (4.6 in) |
| 1970 | 100.8 mm (4.0 in) |
| 1971 | 117.9 mm (4.6 in) |
| 1972 | 150.1 mm (5.9 in) |
| 1973 | 190.5 mm (7.5 in) |
| 1974 | 83.5 mm (3.3 in) |
| 1975 | 119.9 mm (4.7 in) |
| 1976 | 87.1 mm (3.4 in) |
| 1977 | 168.7 mm (6.6 in) |
| 1978 | 66.5 mm (2.6 in) |
| 1979 | 185.2 mm (7.3 in) |
| 1980 | 223.3 mm (8.8 in) |
| 1981 | 87.9 mm (3.5 in) |
| 1982 | 131.5 mm (5.2 in) |
| 1983 | 123.2 mm (4.9 in) |
| 1984 | 100.1 mm (3.9 in) |
| 1985 | 69.6 mm (2.7 in) |
| 1986 | 120.7 mm (4.8 in) |
| 1987 | 111.3 mm (4.4 in) |
| 1988 | 122.2 mm (4.8 in) |
| 1989 | 159.8 mm (6.3 in) |
| 1990 | 137.0 mm (5.4 in) |
| 1991 | 158.5 mm (6.2 in) |
| 1992 | 79.8 mm (3.1 in) |
| 1993 | 89.6 mm (3.5 in) |
| 1994 | 192.8 mm (7.6 in) |
| 1995 | 138.5 mm (5.5 in) |
| 1996 | 113.0 mm (4.4 in) |
| 1997 | 114.6 mm (4.5 in) |
| 1998 | 97.3 mm (3.8 in) |
| 1999 | 83.6 mm (3.3 in) |
| 2000 | 148.8 mm (5.9 in) |
| 2001 | 108.2 mm (4.3 in) |
| 2002 | 104.6 mm (4.1 in) |
| 2003 | 186.6 mm (7.3 in) |
| 2004 | 168.2 mm (6.6 in) |
| 2005 | 81.3 mm (3.2 in) |
| 2006 | 98.6 mm (3.9 in) |
| 2007 | 86.9 mm (3.4 in) |
| 2008 | 121.9 mm (4.8 in) |
| 2009 | 191.0 mm (7.5 in) |
| 2010 | 106.7 mm (4.2 in) |
| 2011 | 262.6 mm (10.3 in) |
| 2012 | 145.3 mm (5.7 in) |
| 2013 | 149.4 mm (5.9 in) |
| 2014 | 90.6 mm (3.6 in) |
| 2015 | 145.3 mm (5.7 in) |
| 2016 | 138.0 mm (5.4 in) |
| 2017 | 108.3 mm (4.3 in) |
| 2018 | 149.9 mm (5.9 in) |
| 2019 | 154.4 mm (6.1 in) |
| 2020 | 128.3 mm (5.1 in) |
| 2021 | 140.5 mm (5.5 in) |
| 2022 | 103.9 mm (4.1 in) |
| 2023 | 77.0 mm (3.0 in) |
| 2024 | 135.4 mm (5.3 in) |
| 2025 | 169.8 mm (6.7 in) |
| 2026 | 104.1 mm (4.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1938 | 4 days |
| 1939 | 14 days |
| 1940 | 25 days |
| 1941 | 21 days |
| 1942 | 24 days |
| 1943 | 24 days |
| 1944 | 27 days |
| 1945 | 19 days |
| 1946 | 18 days |
| 1947 | 17 days |
| 1948 | 19 days |
| 1949 | 15 days |
| 1950 | 20 days |
| 1951 | 23 days |
| 1952 | 29 days |
| 1953 | 30 days |
| 1954 | 32 days |
| 1955 | 24 days |
| 1956 | 17 days |
| 1957 | 21 days |
| 1958 | 20 days |
| 1959 | 20 days |
| 1960 | 18 days |
| 1961 | 19 days |
| 1962 | 29 days |
| 1963 | 23 days |
| 1964 | 26 days |
| 1965 | 20 days |
| 1966 | 19 days |
| 1967 | 25 days |
| 1968 | 16 days |
| 1969 | 16 days |
| 1970 | 20 days |
| 1971 | 13 days |
| 1972 | 12 days |
| 1973 | 15 days |
| 1974 | 18 days |
| 1975 | 11 days |
| 1976 | 18 days |
| 1977 | 18 days |
| 1978 | 24 days |
| 1979 | 12 days |
| 1980 | 18 days |
| 1981 | 23 days |
| 1982 | 19 days |
| 1983 | 20 days |
| 1984 | 26 days |
| 1985 | 18 days |
| 1986 | 19 days |
| 1987 | 20 days |
| 1988 | 24 days |
| 1989 | 18 days |
| 1990 | 17 days |
| 1991 | 18 days |
| 1992 | 16 days |
| 1993 | 17 days |
| 1994 | 15 days |
| 1995 | 14 days |
| 1996 | 19 days |
| 1997 | 15 days |
| 1998 | 35 days |
| 1999 | 29 days |
| 2000 | 29 days |
| 2001 | 29 days |
| 2002 | 16 days |
| 2003 | 10 days |
| 2004 | 21 days |
| 2005 | 33 days |
| 2006 | 13 days |
| 2007 | 26 days |
| 2008 | 24 days |
| 2009 | 17 days |
| 2010 | 20 days |
| 2011 | 33 days |
| 2012 | 22 days |
| 2013 | 19 days |
| 2014 | 17 days |
| 2015 | 15 days |
| 2016 | 33 days |
| 2017 | 14 days |
| 2018 | 13 days |
| 2019 | 17 days |
| 2020 | 14 days |
| 2021 | 20 days |
| 2022 | 17 days |
| 2023 | 20 days |
| 2024 | 28 days |
| 2025 | 15 days |
| 2026 | 32 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
87 years with a frostAcross 87 years with a frost, the median last spring frost at Chattanooga AP falls on 31 March and the median first autumn frost on 3 November, which leaves a median of 214 days between them.
In 1996 to 2025 the median growing season was 227 days. That is 21 days more than in 1939 to 1968.
Fitted over all years, the growing season changes by +3.8 days per decade at this station.
| Measure | Median, all years | Earliest period (1939 to 1968) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 31 March | 7 April | 23 March | 15 days earlier | -2.4 days per decade |
| First autumn frost | 3 November | 30 October | 7 November | 8 days later | +1.4 days per decade |
| Growing days | 214 days | 206 days | 227 days | 21 days more | +3.8 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
87 years, 1939 to 2025A day with at least 77.6 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 193.6 mm (7.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 77.6 mm (3.1 in) | |
| 5 years | 101.9 mm (4.0 in) | |
| 10 years | 120.4 mm (4.7 in) | |
| 25 years | 146.9 mm (5.8 in) | |
| 50 years | 169.1 mm (6.7 in) | |
| 100 years | 193.6 mm (7.6 in) | Longer than the 87 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, 87 years of values from 1939 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: 241.0 mm (9.5 in) in 2011; 163.1 mm (6.4 in) in 2025; 161.8 mm (6.4 in) in 1977.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Chattanooga AP, at 1977. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1977 ran 0.4 C (0.6 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1977 | +0.4 | +0.6 | 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, Chattanooga AP had a mean temperature of 17.2 C (62.9 F) and 1,452.0 mm (57.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Carthage (United States, 474 km away), Tuscaloosa AP ASOS (United States, 301 km away) and Aberdeen (United States, 333 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Carthage | United States | 474 km (295 mi) | 17.1 C (62.7 F) | 1,474.9 mm (58.1 in) | 0.52 |
| Tuscaloosa AP ASOS | United States | 301 km (187 mi) | 17.4 C (63.2 F) | 1,392.0 mm (54.8 in) | 0.52 |
| Aberdeen | United States | 333 km (207 mi) | 17.2 C (63.0 F) | 1,409.8 mm (55.5 in) | 0.55 |
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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-16).