Slidell Weather Records (USC00168539)
Record envelope, standing records and threshold days for Slidell (USC00168539), Louisiana, United States, with 71 years of record.
Key Facts for Slidell
- Slidell (USC00168539) is a weather station in Louisiana, United States at 30.27 latitude and -89.77 longitude, 3 m (10 ft) above sea level.
- The station reports from 1956 to 2026, 71 years of record.
- 1,464 records set at Slidell still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Slidell set a daily record high minimum temperature of 25.0 C (77.0 F) on 10 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Louisiana, United States, 30.27 latitude, -89.77 longitude.
- Elevation: 3 m (10 ft).
- Period of record: 1956 to 2026, 71 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
18 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 27.2 C (81.0 F) | -13.3 C (8.1 F) | 27.2 C (81.0 F) | -6.1 C (21.0 F) |
| Feb | 30.0 C (86.0 F) | -9.4 C (15.1 F) | 29.4 C (84.9 F) | -6.7 C (19.9 F) |
| Mar | 31.7 C (89.1 F) | -5.6 C (21.9 F) | 28.9 C (84.0 F) | 1.1 C (34.0 F) |
| Apr | 33.3 C (91.9 F) | 0.0 C (32.0 F) | 29.4 C (84.9 F) | 6.1 C (43.0 F) |
| May | 35.0 C (95.0 F) | 5.0 C (41.0 F) | 32.2 C (90.0 F) | 9.4 C (48.9 F) |
| Jun | 40.0 C (104.0 F) | 10.0 C (50.0 F) | 34.4 C (93.9 F) | 20.6 C (69.1 F) |
| Jul | 38.9 C (102.0 F) | 13.9 C (57.0 F) | 36.1 C (97.0 F) | 22.8 C (73.0 F) |
| Aug | 39.4 C (102.9 F) | 14.4 C (57.9 F) | 37.2 C (99.0 F) | 22.2 C (72.0 F) |
| Sep | 37.2 C (99.0 F) | 5.6 C (42.1 F) | 33.9 C (93.0 F) | 19.4 C (66.9 F) |
| Oct | 34.4 C (93.9 F) | -0.6 C (30.9 F) | 31.7 C (89.1 F) | 16.7 C (62.1 F) |
| Nov | 32.2 C (90.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Dec | 30.0 C (86.0 F) | -12.8 C (9.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1956 | 30 |
| 1957 | 37 |
| 1958 | 22 |
| 1959 | 12 |
| 1960 | 21 |
| 1961 | 26 |
| 1962 | 33 |
| 1963 | 24 |
| 1964 | 24 |
| 1965 | 23 |
| 1966 | 16 |
| 1967 | 41 |
| 1968 | 14 |
| 1969 | 28 |
| 1970 | 20 |
| 1971 | 28 |
| 1972 | 34 |
| 1973 | 28 |
| 1974 | 36 |
| 1975 | 16 |
| 1976 | 28 |
| 1977 | 19 |
| 1978 | 24 |
| 1979 | 23 |
| 1980 | 23 |
| 1981 | 24 |
| 1982 | 27 |
| 1983 | 20 |
| 1984 | 23 |
| 1985 | 19 |
| 1986 | 19 |
| 1987 | 17 |
| 1988 | 13 |
| 1989 | 34 |
| 1990 | 10 |
| 1991 | 17 |
| 1992 | 10 |
| 1993 | 19 |
| 1994 | 11 |
| 1995 | 16 |
| 1996 | 25 |
| 1997 | 11 |
| 1998 | 25 |
| 1999 | 11 |
| 2000 | 18 |
| 2001 | 17 |
| 2002 | 27 |
| 2003 | 16 |
| 2004 | 19 |
| 2005 | 14 |
| 2006 | 11 |
| 2007 | 11 |
| 2008 | 11 |
| 2009 | 5 |
| 2010 | 25 |
| 2011 | 15 |
| 2012 | 14 |
| 2013 | 19 |
| 2014 | 23 |
| 2015 | 20 |
| 2016 | 11 |
| 2017 | 13 |
| 2018 | 19 |
| 2019 | 13 |
| 2020 | 26 |
| 2021 | 14 |
| 2022 | 19 |
| 2023 | 45 |
| 2024 | 16 |
| 2025 | 18 |
| 2026 | 24 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1989-12-23 | Record low maximum temperature | Record low maximum temperature -2.8 C (27.0 F) |
| 1995-05-10 | Record daily precipitation | Record daily precipitation 340.9 mm (13.4 in) |
Wettest Day of Each Month
May: 340.9 mm (13.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 141.5 mm (5.6 in) | 25 January 1978 |
| Feb | 109.2 mm (4.3 in) | 2 February 2005 |
| Mar | 244.6 mm (9.6 in) | 17 March 1961 |
| Apr | 184.4 mm (7.3 in) | 7 April 1983 |
| May | 340.9 mm (13.4 in) | 10 May 1995 |
| Jun | 221.0 mm (8.7 in) | 19 June 2021 |
| Jul | 191.8 mm (7.6 in) | 21 July 1958 |
| Aug | 254.0 mm (10.0 in) | 30 August 2021 |
| Sep | 173.2 mm (6.8 in) | 26 September 2002 |
| Oct | 157.5 mm (6.2 in) | 23 October 2007 |
| Nov | 136.4 mm (5.4 in) | 29 November 1997 |
| Dec | 120.9 mm (4.8 in) | 2 December 2023 |
Period of Record Coverage
1956 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1956 | 350 | 96% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 361 | 99% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 361 | 99% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 361 | 99% | Yes |
| 1966 | 364 | 100% | Yes |
| 1967 | 364 | 100% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 334 | 92% | Yes |
| 1971 | 353 | 97% | Yes |
| 1972 | 364 | 99% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 364 | 100% | Yes |
| 1983 | 364 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 363 | 99% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 364 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 361 | 99% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 365 | 100% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 362 | 99% | Yes |
| 1999 | 360 | 99% | Yes |
| 2000 | 364 | 99% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 363 | 99% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 347 | 95% | Yes |
| 2006 | 364 | 100% | Yes |
| 2007 | 333 | 91% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 226 | 62% | No |
| 2010 | 364 | 100% | Yes |
| 2011 | 364 | 100% | Yes |
| 2012 | 363 | 99% | Yes |
| 2013 | 360 | 99% | Yes |
| 2014 | 359 | 98% | Yes |
| 2015 | 362 | 99% | Yes |
| 2016 | 364 | 99% | Yes |
| 2017 | 363 | 99% | Yes |
| 2018 | 363 | 99% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 363 | 99% | Yes |
| 2021 | 272 | 75% | No |
| 2022 | 353 | 97% | Yes |
| 2023 | 363 | 99% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 349 | 96% | Yes |
| 2026 | 283 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 10 September 2026 | Slidell, US | daily high min (Provisional) | 25.0 C (77.0 F) | 0.6 C (1.1 F) | 16 years | 12 of 100 (Routine) |
| 8 September 2026 | Slidell, US | daily high min (Tie, Provisional) | 24.4 C (75.9 F) | tie | 7 years | 2 of 100 (Routine) |
| 23 August 2026 | Slidell, US | daily high min (Provisional) | 26.7 C (80.1 F) | 1.1 C (2.0 F) | 12 years | 16 of 100 (Routine) |
| 20 August 2026 | Slidell, US | daily high min (Tie, Provisional) | 27.8 C (82.0 F) | tie | 3 years | 1 of 100 (Routine) |
| 19 August 2026 | Slidell, US | daily high min (Tie, Provisional) | 26.1 C (79.0 F) | tie | 4 years | 2 of 100 (Routine) |
| 18 August 2026 | Slidell, US | daily high min (Provisional) | 28.3 C (82.9 F) | 1.6 C (2.9 F) | 4 years | 16 of 100 (Routine) |
| 17 August 2026 | Slidell, US | daily high min (Tie, Provisional) | 26.1 C (79.0 F) | tie | 24 years | 3 of 100 (Routine) |
| 16 August 2026 | Slidell, US | daily high min (Provisional) | 27.2 C (81.0 F) | 1.1 C (2.0 F) | 4 years | 14 of 100 (Routine) |
| 15 August 2026 | Slidell, US | daily high max (Tie, Provisional) | 36.1 C (97.0 F) | tie | 3 years | 1 of 100 (Routine) |
| 13 August 2026 | Slidell, US | daily high min | 28.3 C (82.9 F) | 0.5 C (0.9 F) | 3 years | 9 of 100 (Routine) |
| 1 August 2026 | Slidell, US | daily high min | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 13 years | 13 of 100 (Routine) |
| 30 July 2026 | Slidell, US | monthly high min (Tie) | 27.8 C (82.0 F) | tie | 28 years | 6 of 100 (Routine) |
| 29 July 2026 | Slidell, US | daily high min | 26.7 C (80.1 F) | 0.6 C (1.1 F) | 11 years | 13 of 100 (Routine) |
| 28 July 2026 | Slidell, US | daily high min | 26.7 C (80.1 F) | 0.6 C (1.1 F) | 47 years | 24 of 100 (Routine) |
| 27 July 2026 | Slidell, US | daily high min | 26.7 C (80.1 F) | 0.6 C (1.1 F) | 32 years | 19 of 100 (Routine) |
| 18 July 2026 | Slidell, US | daily high min (Tie) | 25.6 C (78.1 F) | tie | 16 years | 2 of 100 (Routine) |
| 17 July 2026 | Slidell, US | daily high min (Tie) | 26.1 C (79.0 F) | tie | 1 year | 1 of 100 (Routine) |
| 14 July 2026 | Slidell, US | daily low max (Tie) | 28.3 C (82.9 F) | tie | 7 years | 2 of 100 (Routine) |
| 18 June 2026 | Slidell, US | daily rain | 158.2 mm (6.2 in) | 99.8 mm (3.9 in) | 1 year | 47 of 100 (Notable) |
| 15 June 2026 | Slidell, US | daily rain (Tie) | 45.2 mm (1.8 in) | tie | 0 years | 1 of 100 (Routine) |
Climate Trend
63 complete years, 1956 to 2024| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1956 | 20.3 C | +0.36 C |
| 1957 | 20.6 C | +0.66 C |
| 1958 | 19.3 C | -0.58 C |
| 1959 | 19.9 C | +0.01 C |
| 1960 | 19.7 C | -0.21 C |
| 1961 | 19.7 C | -0.22 C |
| 1962 | 20.4 C | +0.49 C |
| 1963 | 19.8 C | -0.10 C |
| 1964 | 20.1 C | +0.13 C |
| 1965 | 20.7 C | +0.76 C |
| 1966 | 19.7 C | -0.27 C |
| 1967 | 20.0 C | +0.10 C |
| 1968 | 19.4 C | -0.55 C |
| 1969 | 19.8 C | -0.09 C |
| 1971 | 20.6 C | +0.67 C |
| 1972 | 20.8 C | +0.86 C |
| 1973 | 19.7 C | -0.20 C |
| 1974 | 19.5 C | -0.39 C |
| 1975 | 19.3 C | -0.60 C |
| 1976 | 18.4 C | -1.57 C |
| 1977 | 19.2 C | -0.75 C |
| 1978 | 18.9 C | -1.06 C |
| 1979 | 19.1 C | -0.81 C |
| 1980 | 19.8 C | -0.11 C |
| 1981 | 19.8 C | -0.08 C |
| 1982 | 20.4 C | +0.49 C |
| 1983 | 18.8 C | -1.11 C |
| 1984 | 19.8 C | -0.13 C |
| 1985 | 20.1 C | +0.22 C |
| 1986 | 20.4 C | +0.51 C |
| 1987 | 19.7 C | -0.20 C |
| 1988 | 19.6 C | -0.34 C |
| 1989 | 19.6 C | -0.28 C |
| 1990 | 20.4 C | +0.48 C |
| 1991 | 20.0 C | +0.04 C |
| 1992 | 19.6 C | -0.29 C |
| 1993 | 19.6 C | -0.30 C |
| 1994 | 19.9 C | -0.02 C |
| 1995 | 20.0 C | +0.08 C |
| 1996 | 19.5 C | -0.38 C |
| 1997 | 19.6 C | -0.30 C |
| 1998 | 20.8 C | +0.84 C |
| 1999 | 19.5 C | -0.45 C |
| 2000 | 19.6 C | -0.34 C |
| 2001 | 19.8 C | -0.08 C |
| 2002 | 19.9 C | -0.02 C |
| 2003 | 19.7 C | -0.24 C |
| 2004 | 19.9 C | +0.01 C |
| 2006 | 20.3 C | +0.42 C |
| 2008 | 19.6 C | -0.30 C |
| 2010 | 18.9 C | -1.07 C |
| 2011 | 19.9 C | -0.04 C |
| 2012 | 20.6 C | +0.68 C |
| 2013 | 19.5 C | -0.47 C |
| 2014 | 18.9 C | -0.99 C |
| 2015 | 20.6 C | +0.69 C |
| 2016 | 20.7 C | +0.80 C |
| 2017 | 20.8 C | +0.88 C |
| 2018 | 20.5 C | +0.61 C |
| 2019 | 20.4 C | +0.43 C |
| 2020 | 20.7 C | +0.78 C |
| 2023 | 21.5 C | +1.62 C |
| 2024 | 21.2 C | +1.27 C |
The annual mean temperature here has risen by 0.08 C (0.00 to 0.16) per decade over 1956 to 2024. In Fahrenheit: 0.14 F (0.01 to 0.28) per decade. The slope is a straight line fitted to 63 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.08 C (0.00 to 0.16) per decade | 0.14 F (0.01 to 0.28) per decade | 1956 to 2024 | 63 | Rise |
| Mean daily maximum | -0.09 C (-0.16 to -0.02) per decade | -0.16 F (-0.30 to -0.03) per decade | 1956 to 2024 | 63 | Fall |
| Mean daily minimum | 0.3 C (0.2 to 0.3) per decade | 0.5 F (0.3 to 0.6) per decade | 1956 to 2024 | 63 | 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
1956 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.0 C (104.0 F) | 1964 | 36.1 C (97.0 F) | 71 |
| Coldest night (TNn) | -13.3 C (8.1 F) | 1985 | -5.6 C (21.9 F) | 71 |
| Wettest day (Rx1day) | 340.9 mm (13.4 in) | 1995 | 109.7 mm (4.3 in) | 71 |
| Wettest five days (Rx5day) | 586.8 mm (23.1 in) | 1995 | 173.0 mm (6.8 in) | 71 |
| Longest dry spell (CDD) | 51 days | 2011 | 23 days | 71 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1956 | 36.7 C (98.1 F) |
| 1957 | 37.2 C (99.0 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 35.0 C (95.0 F) |
| 1960 | 37.2 C (99.0 F) |
| 1961 | 36.7 C (98.1 F) |
| 1962 | 37.2 C (99.0 F) |
| 1963 | 36.1 C (97.0 F) |
| 1964 | 40.0 C (104.0 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 35.6 C (96.1 F) |
| 1967 | 35.6 C (96.1 F) |
| 1968 | 35.6 C (96.1 F) |
| 1969 | 37.8 C (100.0 F) |
| 1970 | 39.4 C (102.9 F) |
| 1971 | 36.7 C (98.1 F) |
| 1972 | 37.8 C (100.0 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 36.1 C (97.0 F) |
| 1975 | 33.9 C (93.0 F) |
| 1976 | 35.6 C (96.1 F) |
| 1977 | 35.6 C (96.1 F) |
| 1978 | 36.1 C (97.0 F) |
| 1979 | 36.7 C (98.1 F) |
| 1980 | 38.9 C (102.0 F) |
| 1981 | 37.2 C (99.0 F) |
| 1982 | 36.1 C (97.0 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 35.0 C (95.0 F) |
| 1985 | 35.6 C (96.1 F) |
| 1986 | 38.9 C (102.0 F) |
| 1987 | 36.7 C (98.1 F) |
| 1988 | 35.6 C (96.1 F) |
| 1989 | 37.2 C (99.0 F) |
| 1990 | 36.7 C (98.1 F) |
| 1991 | 35.6 C (96.1 F) |
| 1992 | 35.6 C (96.1 F) |
| 1993 | 36.7 C (98.1 F) |
| 1994 | 33.9 C (93.0 F) |
| 1995 | 36.7 C (98.1 F) |
| 1996 | 35.0 C (95.0 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 36.7 C (98.1 F) |
| 1999 | 36.7 C (98.1 F) |
| 2000 | 37.2 C (99.0 F) |
| 2001 | 34.4 C (93.9 F) |
| 2002 | 35.6 C (96.1 F) |
| 2003 | 34.4 C (93.9 F) |
| 2004 | 36.1 C (97.0 F) |
| 2005 | 36.7 C (98.1 F) |
| 2006 | 35.6 C (96.1 F) |
| 2007 | 37.2 C (99.0 F) |
| 2008 | 35.6 C (96.1 F) |
| 2009 | 36.7 C (98.1 F) |
| 2010 | 36.1 C (97.0 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 36.1 C (97.0 F) |
| 2013 | 33.9 C (93.0 F) |
| 2014 | 35.6 C (96.1 F) |
| 2015 | 36.7 C (98.1 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 34.4 C (93.9 F) |
| 2018 | 35.0 C (95.0 F) |
| 2019 | 35.6 C (96.1 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 36.1 C (97.0 F) |
| 2022 | 36.7 C (98.1 F) |
| 2023 | 38.3 C (100.9 F) |
| 2024 | 36.1 C (97.0 F) |
| 2025 | 36.7 C (98.1 F) |
| 2026 | 37.2 C (99.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1956 | -3.3 C (26.1 F) |
| 1957 | -7.2 C (19.0 F) |
| 1958 | -7.8 C (18.0 F) |
| 1959 | -7.2 C (19.0 F) |
| 1960 | -5.6 C (21.9 F) |
| 1961 | -5.6 C (21.9 F) |
| 1962 | -12.8 C (9.0 F) |
| 1963 | -11.7 C (10.9 F) |
| 1964 | -7.8 C (18.0 F) |
| 1965 | -6.1 C (21.0 F) |
| 1966 | -9.4 C (15.1 F) |
| 1967 | -5.0 C (23.0 F) |
| 1968 | -4.4 C (24.1 F) |
| 1969 | -6.7 C (19.9 F) |
| 1970 | -7.2 C (19.0 F) |
| 1971 | -5.0 C (23.0 F) |
| 1972 | -6.7 C (19.9 F) |
| 1973 | -5.6 C (21.9 F) |
| 1974 | -3.9 C (25.0 F) |
| 1975 | -7.2 C (19.0 F) |
| 1976 | -6.1 C (21.0 F) |
| 1977 | -10.0 C (14.0 F) |
| 1978 | -5.6 C (21.9 F) |
| 1979 | -8.3 C (17.1 F) |
| 1980 | -5.6 C (21.9 F) |
| 1981 | -7.8 C (18.0 F) |
| 1982 | -12.2 C (10.0 F) |
| 1983 | -11.1 C (12.0 F) |
| 1984 | -5.6 C (21.9 F) |
| 1985 | -13.3 C (8.1 F) |
| 1986 | -4.4 C (24.1 F) |
| 1987 | -3.9 C (25.0 F) |
| 1988 | -5.6 C (21.9 F) |
| 1989 | -12.8 C (9.0 F) |
| 1990 | -3.3 C (26.1 F) |
| 1991 | -3.3 C (26.1 F) |
| 1992 | -3.3 C (26.1 F) |
| 1993 | -4.4 C (24.1 F) |
| 1994 | -4.4 C (24.1 F) |
| 1995 | -3.9 C (25.0 F) |
| 1996 | -9.4 C (15.1 F) |
| 1997 | -6.1 C (21.0 F) |
| 1998 | -1.1 C (30.0 F) |
| 1999 | -6.7 C (19.9 F) |
| 2000 | -6.1 C (21.0 F) |
| 2001 | -6.1 C (21.0 F) |
| 2002 | -6.7 C (19.9 F) |
| 2003 | -6.1 C (21.0 F) |
| 2004 | -4.4 C (24.1 F) |
| 2005 | -3.9 C (25.0 F) |
| 2006 | -3.9 C (25.0 F) |
| 2007 | -3.3 C (26.1 F) |
| 2008 | -5.0 C (23.0 F) |
| 2009 | -4.4 C (24.1 F) |
| 2010 | -7.2 C (19.0 F) |
| 2011 | -5.6 C (21.9 F) |
| 2012 | -2.2 C (28.0 F) |
| 2013 | -1.7 C (28.9 F) |
| 2014 | -7.2 C (19.0 F) |
| 2015 | -5.6 C (21.9 F) |
| 2016 | -2.2 C (28.0 F) |
| 2017 | -3.9 C (25.0 F) |
| 2018 | -8.3 C (17.1 F) |
| 2019 | -2.8 C (27.0 F) |
| 2020 | -1.1 C (30.0 F) |
| 2021 | -5.6 C (21.9 F) |
| 2022 | -5.6 C (21.9 F) |
| 2023 | -1.1 C (30.0 F) |
| 2024 | -7.8 C (18.0 F) |
| 2025 | -11.7 C (10.9 F) |
| 2026 | -6.7 C (19.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1956 | 150.1 mm (5.9 in) |
| 1957 | 135.9 mm (5.4 in) |
| 1958 | 335.3 mm (13.2 in) |
| 1959 | 92.7 mm (3.6 in) |
| 1960 | 106.9 mm (4.2 in) |
| 1961 | 244.6 mm (9.6 in) |
| 1962 | 68.1 mm (2.7 in) |
| 1963 | 92.7 mm (3.6 in) |
| 1964 | 88.6 mm (3.5 in) |
| 1965 | 91.7 mm (3.6 in) |
| 1966 | 70.6 mm (2.8 in) |
| 1967 | 84.3 mm (3.3 in) |
| 1968 | 79.2 mm (3.1 in) |
| 1969 | 127.8 mm (5.0 in) |
| 1970 | 86.1 mm (3.4 in) |
| 1971 | 82.6 mm (3.3 in) |
| 1972 | 106.4 mm (4.2 in) |
| 1973 | 112.3 mm (4.4 in) |
| 1974 | 194.1 mm (7.6 in) |
| 1975 | 87.6 mm (3.4 in) |
| 1976 | 88.9 mm (3.5 in) |
| 1977 | 89.9 mm (3.5 in) |
| 1978 | 141.5 mm (5.6 in) |
| 1979 | 96.8 mm (3.8 in) |
| 1980 | 162.1 mm (6.4 in) |
| 1981 | 85.9 mm (3.4 in) |
| 1982 | 105.9 mm (4.2 in) |
| 1983 | 184.4 mm (7.3 in) |
| 1984 | 53.1 mm (2.1 in) |
| 1985 | 154.9 mm (6.1 in) |
| 1986 | 91.4 mm (3.6 in) |
| 1987 | 94.7 mm (3.7 in) |
| 1988 | 134.4 mm (5.3 in) |
| 1989 | 70.4 mm (2.8 in) |
| 1990 | 109.7 mm (4.3 in) |
| 1991 | 118.6 mm (4.7 in) |
| 1992 | 118.9 mm (4.7 in) |
| 1993 | 104.9 mm (4.1 in) |
| 1994 | 81.3 mm (3.2 in) |
| 1995 | 340.9 mm (13.4 in) |
| 1996 | 144.0 mm (5.7 in) |
| 1997 | 136.4 mm (5.4 in) |
| 1998 | 124.2 mm (4.9 in) |
| 1999 | 76.2 mm (3.0 in) |
| 2000 | 106.7 mm (4.2 in) |
| 2001 | 208.3 mm (8.2 in) |
| 2002 | 173.2 mm (6.8 in) |
| 2003 | 118.4 mm (4.7 in) |
| 2004 | 90.4 mm (3.6 in) |
| 2005 | 159.8 mm (6.3 in) |
| 2006 | 96.8 mm (3.8 in) |
| 2007 | 157.5 mm (6.2 in) |
| 2008 | 127.5 mm (5.0 in) |
| 2009 | 114.6 mm (4.5 in) |
| 2010 | 92.7 mm (3.6 in) |
| 2011 | 154.9 mm (6.1 in) |
| 2012 | 148.6 mm (5.9 in) |
| 2013 | 90.2 mm (3.6 in) |
| 2014 | 164.1 mm (6.5 in) |
| 2015 | 96.5 mm (3.8 in) |
| 2016 | 83.8 mm (3.3 in) |
| 2017 | 136.7 mm (5.4 in) |
| 2018 | 129.8 mm (5.1 in) |
| 2019 | 151.9 mm (6.0 in) |
| 2020 | 95.5 mm (3.8 in) |
| 2021 | 254.0 mm (10.0 in) |
| 2022 | 103.6 mm (4.1 in) |
| 2023 | 131.1 mm (5.2 in) |
| 2024 | 146.1 mm (5.8 in) |
| 2025 | 82.6 mm (3.3 in) |
| 2026 | 158.2 mm (6.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1956 | 233.4 mm (9.2 in) |
| 1957 | 190.7 mm (7.5 in) |
| 1958 | 364.2 mm (14.3 in) |
| 1959 | 126.1 mm (5.0 in) |
| 1960 | 210.6 mm (8.3 in) |
| 1961 | 290.8 mm (11.4 in) |
| 1962 | 104.4 mm (4.1 in) |
| 1963 | 179.0 mm (7.0 in) |
| 1964 | 162.5 mm (6.4 in) |
| 1965 | 118.4 mm (4.7 in) |
| 1966 | 165.6 mm (6.5 in) |
| 1967 | 112.2 mm (4.4 in) |
| 1968 | 116.5 mm (4.6 in) |
| 1969 | 194.3 mm (7.6 in) |
| 1970 | 158.2 mm (6.2 in) |
| 1971 | 105.9 mm (4.2 in) |
| 1972 | 109.0 mm (4.3 in) |
| 1973 | 187.0 mm (7.4 in) |
| 1974 | 201.7 mm (7.9 in) |
| 1975 | 123.9 mm (4.9 in) |
| 1976 | 94.4 mm (3.7 in) |
| 1977 | 133.4 mm (5.3 in) |
| 1978 | 172.0 mm (6.8 in) |
| 1979 | 151.3 mm (6.0 in) |
| 1980 | 257.4 mm (10.1 in) |
| 1981 | 129.4 mm (5.1 in) |
| 1982 | 113.0 mm (4.4 in) |
| 1983 | 225.6 mm (8.9 in) |
| 1984 | 102.4 mm (4.0 in) |
| 1985 | 195.8 mm (7.7 in) |
| 1986 | 107.4 mm (4.2 in) |
| 1987 | 123.3 mm (4.9 in) |
| 1988 | 245.1 mm (9.6 in) |
| 1989 | 92.1 mm (3.6 in) |
| 1990 | 131.1 mm (5.2 in) |
| 1991 | 230.3 mm (9.1 in) |
| 1992 | 173.0 mm (6.8 in) |
| 1993 | 190.5 mm (7.5 in) |
| 1994 | 119.6 mm (4.7 in) |
| 1995 | 586.8 mm (23.1 in) |
| 1996 | 155.7 mm (6.1 in) |
| 1997 | 152.9 mm (6.0 in) |
| 1998 | 200.4 mm (7.9 in) |
| 1999 | 130.9 mm (5.2 in) |
| 2000 | 201.7 mm (7.9 in) |
| 2001 | 355.1 mm (14.0 in) |
| 2002 | 255.0 mm (10.0 in) |
| 2003 | 190.6 mm (7.5 in) |
| 2004 | 188.0 mm (7.4 in) |
| 2005 | 183.9 mm (7.2 in) |
| 2006 | 147.6 mm (5.8 in) |
| 2007 | 184.9 mm (7.3 in) |
| 2008 | 182.1 mm (7.2 in) |
| 2009 | 201.9 mm (7.9 in) |
| 2010 | 161.4 mm (6.4 in) |
| 2011 | 299.7 mm (11.8 in) |
| 2012 | 242.4 mm (9.5 in) |
| 2013 | 146.6 mm (5.8 in) |
| 2014 | 179.3 mm (7.1 in) |
| 2015 | 167.3 mm (6.6 in) |
| 2016 | 108.0 mm (4.3 in) |
| 2017 | 200.0 mm (7.9 in) |
| 2018 | 130.1 mm (5.1 in) |
| 2019 | 174.8 mm (6.9 in) |
| 2020 | 189.9 mm (7.5 in) |
| 2021 | 352.8 mm (13.9 in) |
| 2022 | 143.0 mm (5.6 in) |
| 2023 | 167.9 mm (6.6 in) |
| 2024 | 190.9 mm (7.5 in) |
| 2025 | 129.8 mm (5.1 in) |
| 2026 | 290.5 mm (11.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1956 | 19 days |
| 1957 | 15 days |
| 1958 | 19 days |
| 1959 | 20 days |
| 1960 | 23 days |
| 1961 | 20 days |
| 1962 | 31 days |
| 1963 | 39 days |
| 1964 | 22 days |
| 1965 | 20 days |
| 1966 | 22 days |
| 1967 | 28 days |
| 1968 | 22 days |
| 1969 | 23 days |
| 1970 | 21 days |
| 1971 | 38 days |
| 1972 | 23 days |
| 1973 | 16 days |
| 1974 | 19 days |
| 1975 | 14 days |
| 1976 | 25 days |
| 1977 | 26 days |
| 1978 | 38 days |
| 1979 | 31 days |
| 1980 | 17 days |
| 1981 | 32 days |
| 1982 | 16 days |
| 1983 | 16 days |
| 1984 | 23 days |
| 1985 | 23 days |
| 1986 | 22 days |
| 1987 | 36 days |
| 1988 | 20 days |
| 1989 | 31 days |
| 1990 | 18 days |
| 1991 | 18 days |
| 1992 | 23 days |
| 1993 | 24 days |
| 1994 | 17 days |
| 1995 | 14 days |
| 1996 | 20 days |
| 1997 | 14 days |
| 1998 | 36 days |
| 1999 | 34 days |
| 2000 | 26 days |
| 2001 | 39 days |
| 2002 | 33 days |
| 2003 | 25 days |
| 2004 | 14 days |
| 2005 | 36 days |
| 2006 | 29 days |
| 2007 | 28 days |
| 2008 | 22 days |
| 2009 | 29 days |
| 2010 | 25 days |
| 2011 | 51 days |
| 2012 | 16 days |
| 2013 | 19 days |
| 2014 | 29 days |
| 2015 | 25 days |
| 2016 | 21 days |
| 2017 | 18 days |
| 2018 | 14 days |
| 2019 | 16 days |
| 2020 | 20 days |
| 2021 | 24 days |
| 2022 | 30 days |
| 2023 | 28 days |
| 2024 | 26 days |
| 2025 | 25 days |
| 2026 | 19 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
58 years with a frostAcross 58 years with a frost, the median last spring frost at Slidell falls on 27 February and the median first autumn frost on 26 November, which leaves a median of 272 days between them.
Fitted over all years, the growing season changes by +3.4 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1987 to 2020) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 27 February | n/a | 17 February | n/a | -1.6 days per decade |
| First autumn frost | 26 November | n/a | 29 November | n/a | +1.8 days per decade |
| Growing days | 272 days | n/a | 273 days | n/a | +3.4 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
69 years, 1956 to 2025A day with at least 110.7 mm (4.4 in) of rain is expected about once in 2 years. A day with at least 344.4 mm (13.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 110.7 mm (4.4 in) | |
| 5 years | 152.3 mm (6.0 in) | |
| 10 years | 186.7 mm (7.4 in) | |
| 25 years | 240.0 mm (9.4 in) | |
| 50 years | 288.0 mm (11.3 in) | |
| 100 years | 344.4 mm (13.6 in) | Longer than the 69 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, 69 years of values from 1956 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: 340.9 mm (13.4 in) in 1995; 335.3 mm (13.2 in) in 1958; 254.0 mm (10.0 in) in 2021.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Slidell, at 1979 and 1999. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1979 ran 0.2 C (0.4 F) higher than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1999 ran 0.3 C (0.6 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1979 | +0.2 | +0.4 | possible | 5 |
| 1999 | -0.3 | -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
2006 to 2024 against 1961 to 1990Over 2006 to 2024, Slidell had a mean temperature of 20.3 C (68.5 F) and 1,628.9 mm (64.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Franklin 3 NW (United States, 178 km away), Thibodaux 4 SE (United States, 112 km away) and Houma (United States, 122 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Franklin 3 NW | United States | 178 km (111 mi) | 20.0 C (67.9 F) | 1,611.3 mm (63.4 in) | 0.49 |
| Thibodaux 4 SE | United States | 112 km (70 mi) | 20.2 C (68.4 F) | 1,659.3 mm (65.3 in) | 0.51 |
| Houma | United States | 122 km (76 mi) | 20.3 C (68.5 F) | 1,604.1 mm (63.2 in) | 0.54 |
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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).