Portland Sewage Plt Weather Records (USC00407359)
Record envelope, standing records and threshold days for Portland Sewage Plt (USC00407359), Tennessee, United States, with 72 years of record.
Key Facts for Portland Sewage Plt
- Portland Sewage Plt (USC00407359) is a weather station in Tennessee, United States at 36.59 latitude and -86.53 longitude, 242 m (794 ft) above sea level.
- The station reports from 1955 to 2026, 72 years of record.
- 1,464 records set at Portland Sewage Plt still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Portland Sewage Plt tied a daily record high maximum temperature of 33.9 C (93.0 F) on 12 September 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, 36.59 latitude, -86.53 longitude.
- Elevation: 242 m (794 ft).
- Period of record: 1955 to 2026, 72 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
7 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 23.3 C (73.9 F) | -28.3 C (-18.9 F) | 21.1 C (70.0 F) | -12.2 C (10.0 F) |
| Feb | 27.2 C (81.0 F) | -22.8 C (-9.0 F) | 17.2 C (63.0 F) | -15.6 C (3.9 F) |
| Mar | 31.1 C (88.0 F) | -18.3 C (-0.9 F) | 31.1 C (88.0 F) | -5.6 C (21.9 F) |
| Apr | 31.7 C (89.1 F) | -6.1 C (21.0 F) | 29.4 C (84.9 F) | 2.8 C (37.0 F) |
| May | 34.4 C (93.9 F) | -1.7 C (28.9 F) | 32.8 C (91.0 F) | 3.3 C (37.9 F) |
| Jun | 41.1 C (106.0 F) | 2.2 C (36.0 F) | 35.0 C (95.0 F) | 12.8 C (55.0 F) |
| Jul | 40.6 C (105.1 F) | 8.9 C (48.0 F) | 36.7 C (98.1 F) | 17.2 C (63.0 F) |
| Aug | 40.6 C (105.1 F) | 6.7 C (44.1 F) | 37.2 C (99.0 F) | 15.6 C (60.1 F) |
| Sep | 37.8 C (100.0 F) | 0.0 C (32.0 F) | 35.0 C (95.0 F) | 12.2 C (54.0 F) |
| Oct | 35.0 C (95.0 F) | -5.6 C (21.9 F) | 32.8 C (91.0 F) | 16.7 C (62.1 F) |
| Nov | 30.0 C (86.0 F) | -12.8 C (9.0 F) | n/a | n/a |
| Dec | 24.4 C (75.9 F) | -25.6 C (-14.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1955 | 15 |
| 1956 | 20 |
| 1957 | 19 |
| 1958 | 15 |
| 1959 | 19 |
| 1960 | 23 |
| 1961 | 29 |
| 1962 | 34 |
| 1963 | 54 |
| 1964 | 33 |
| 1965 | 29 |
| 1966 | 25 |
| 1967 | 38 |
| 1968 | 15 |
| 1969 | 16 |
| 1970 | 36 |
| 1971 | 20 |
| 1972 | 21 |
| 1973 | 10 |
| 1974 | 32 |
| 1975 | 16 |
| 1976 | 28 |
| 1977 | 28 |
| 1978 | 17 |
| 1979 | 17 |
| 1980 | 27 |
| 1981 | 11 |
| 1982 | 14 |
| 1983 | 25 |
| 1984 | 14 |
| 1985 | 20 |
| 1986 | 27 |
| 1987 | 15 |
| 1988 | 16 |
| 1989 | 30 |
| 1990 | 26 |
| 1991 | 23 |
| 1992 | 11 |
| 1993 | 15 |
| 1994 | 9 |
| 1995 | 9 |
| 1996 | 27 |
| 1997 | 18 |
| 1998 | 26 |
| 1999 | 19 |
| 2000 | 17 |
| 2001 | 8 |
| 2002 | 17 |
| 2003 | 10 |
| 2004 | 16 |
| 2005 | 11 |
| 2006 | 15 |
| 2007 | 35 |
| 2008 | 10 |
| 2009 | 11 |
| 2010 | 27 |
| 2011 | 27 |
| 2012 | 32 |
| 2013 | 14 |
| 2014 | 20 |
| 2015 | 11 |
| 2016 | 13 |
| 2017 | 10 |
| 2018 | 30 |
| 2019 | 26 |
| 2020 | 13 |
| 2021 | 27 |
| 2022 | 18 |
| 2023 | 12 |
| 2024 | 21 |
| 2025 | 10 |
| 2026 | 12 |
All-Time Record Progression
6 new records| Date | Kind | Detail |
|---|---|---|
| 1985-06-25 | Record high maximum temperature | Record high maximum temperature 38.9 C (102.0 F) |
| 1987-08-08 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 1989-12-23 | Record low maximum temperature | Record low maximum temperature -18.9 C (-2.0 F) |
| 2007-08-16 | Record high maximum temperature | Record high maximum temperature 39.4 C (102.9 F) |
| 2007-08-17 | Record high maximum temperature | Record high maximum temperature 40.6 C (105.1 F) |
| 2012-06-30 | Record high maximum temperature | Record high maximum temperature 41.1 C (106.0 F) |
Wettest Day of Each Month
Jun: 204.5 mm (8.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 96.8 mm (3.8 in) | 23 January 1999 |
| Feb | 116.6 mm (4.6 in) | 16 February 2025 |
| Mar | 109.0 mm (4.3 in) | 12 March 1975 |
| Apr | 101.6 mm (4.0 in) | 4 April 1968 |
| May | 158.2 mm (6.2 in) | 9 May 2024 |
| Jun | 204.5 mm (8.1 in) | 23 June 1969 |
| Jul | 102.1 mm (4.0 in) | 26 July 2022 |
| Aug | 157.2 mm (6.2 in) | 30 August 2005 |
| Sep | 150.9 mm (5.9 in) | 14 September 1979 |
| Oct | 87.1 mm (3.4 in) | 5 October 1995 |
| Nov | 114.0 mm (4.5 in) | 27 November 1973 |
| Dec | 101.6 mm (4.0 in) | 9 December 1978 |
Period of Record Coverage
1955 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1955 | 199 | 55% | No |
| 1956 | 363 | 99% | Yes |
| 1957 | 362 | 99% | Yes |
| 1958 | 363 | 99% | Yes |
| 1959 | 360 | 99% | Yes |
| 1960 | 338 | 92% | Yes |
| 1961 | 299 | 82% | No |
| 1962 | 326 | 89% | No |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 362 | 99% | Yes |
| 1966 | 335 | 92% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 363 | 99% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 361 | 99% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 362 | 99% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 363 | 99% | Yes |
| 1978 | 360 | 99% | Yes |
| 1979 | 344 | 94% | Yes |
| 1980 | 360 | 98% | Yes |
| 1981 | 346 | 95% | Yes |
| 1982 | 359 | 98% | Yes |
| 1983 | 293 | 80% | No |
| 1984 | 322 | 88% | No |
| 1985 | 354 | 97% | Yes |
| 1986 | 359 | 98% | Yes |
| 1987 | 361 | 99% | Yes |
| 1988 | 357 | 98% | Yes |
| 1989 | 360 | 99% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 363 | 99% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 364 | 100% | Yes |
| 1994 | 363 | 99% | Yes |
| 1995 | 362 | 99% | Yes |
| 1996 | 364 | 99% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 333 | 91% | Yes |
| 2000 | 364 | 99% | Yes |
| 2001 | 357 | 98% | Yes |
| 2002 | 351 | 96% | Yes |
| 2003 | 363 | 99% | Yes |
| 2004 | 348 | 95% | Yes |
| 2005 | 355 | 97% | Yes |
| 2006 | 355 | 97% | Yes |
| 2007 | 355 | 97% | Yes |
| 2008 | 358 | 98% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 363 | 99% | Yes |
| 2011 | 357 | 98% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 329 | 90% | Yes |
| 2015 | 120 | 33% | No |
| 2016 | 313 | 86% | No |
| 2017 | 322 | 88% | No |
| 2018 | 360 | 99% | Yes |
| 2019 | 356 | 98% | Yes |
| 2020 | 361 | 99% | Yes |
| 2021 | 331 | 91% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 360 | 99% | Yes |
| 2024 | 335 | 92% | Yes |
| 2025 | 360 | 99% | Yes |
| 2026 | 237 | 65% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 12 September 2026 | Portland Sewage Plt, US | daily high max (Tie, Provisional) | 33.9 C (93.0 F) | tie | 43 years | 4 of 100 (Routine) |
| 12 September 2026 | Portland Sewage Plt, US | daily high min (Tie, Provisional) | 21.7 C (71.1 F) | tie | 37 years | 4 of 100 (Routine) |
| 10 September 2026 | Portland Sewage Plt, US | monthly high min (Provisional) | 25.0 C (77.0 F) | 1.1 C (2.0 F) | 66 years | 38 of 100 (Notable) |
| 20 August 2026 | Portland Sewage Plt, US | daily rain (Provisional) | 29.5 mm (1.2 in) | 5.1 mm (0.20 in) | 28 years | 18 of 100 (Routine) |
| 15 August 2026 | Portland Sewage Plt, US | daily high min (Provisional) | 24.4 C (75.9 F) | 0.5 C (0.9 F) | 16 years | 12 of 100 (Routine) |
| 14 August 2026 | Portland Sewage Plt, US | daily high min | 24.4 C (75.9 F) | 1.6 C (2.9 F) | 41 years | 24 of 100 (Routine) |
| 13 August 2026 | Portland Sewage Plt, US | daily high min (Tie) | 23.3 C (73.9 F) | tie | 16 years | 2 of 100 (Routine) |
| 3 August 2026 | Portland Sewage Plt, US | daily low max (Tie) | 25.6 C (78.1 F) | tie | 52 years | 5 of 100 (Routine) |
| 22 July 2026 | Portland Sewage Plt, US | daily rain | 48.3 mm (1.9 in) | 15.0 mm (0.6 in) | 45 years | 30 of 100 (Routine) |
| 12 July 2026 | Portland Sewage Plt, US | daily rain | 46.0 mm (1.8 in) | 22.6 mm (0.9 in) | 37 years | 33 of 100 (Routine) |
| 10 June 2026 | Portland Sewage Plt, US | daily rain | 46.0 mm (1.8 in) | 9.9 mm (0.39 in) | 12 years | 16 of 100 (Routine) |
| 8 June 2026 | Portland Sewage Plt, US | daily high min (Tie) | 22.2 C (72.0 F) | tie | 17 years | 3 of 100 (Routine) |
| 20 May 2026 | Portland Sewage Plt, US | daily high max (Tie) | 32.8 C (91.0 F) | tie | 64 years | 6 of 100 (Routine) |
| 7 May 2026 | Portland Sewage Plt, US | daily low max | 14.4 C (57.9 F) | 0.6 C (1.1 F) | 5 years | 9 of 100 (Routine) |
| 5 April 2026 | Portland Sewage Plt, US | daily high min | 18.3 C (64.9 F) | 0.5 C (0.9 F) | 28 years | 15 of 100 (Routine) |
| 4 April 2026 | Portland Sewage Plt, US | daily high min (Tie) | 18.3 C (64.9 F) | tie | 44 years | 5 of 100 (Routine) |
| 27 March 2026 | Portland Sewage Plt, US | daily high max | 29.4 C (84.9 F) | 0.5 C (0.9 F) | 19 years | 12 of 100 (Routine) |
| 23 March 2026 | Portland Sewage Plt, US | monthly high max | 31.1 C (88.0 F) | 1.7 C (3.1 F) | 62 years | 37 of 100 (Notable) |
| 22 March 2026 | Portland Sewage Plt, US | daily high max | 28.3 C (82.9 F) | 1.1 C (2.0 F) | 13 years | 12 of 100 (Routine) |
| 17 March 2026 | Portland Sewage Plt, US | daily low max | 2.2 C (36.0 F) | 1.7 C (3.1 F) | 65 years | 28 of 100 (Routine) |
Climate Trend
56 complete years, 1956 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1956 | 15.5 C | +1.21 C |
| 1957 | 15.3 C | +1.01 C |
| 1958 | 13.6 C | -0.65 C |
| 1959 | 15.0 C | +0.78 C |
| 1960 | 13.8 C | -0.43 C |
| 1963 | 12.6 C | -1.62 C |
| 1964 | 13.7 C | -0.59 C |
| 1965 | 14.5 C | +0.20 C |
| 1967 | 13.6 C | -0.64 C |
| 1968 | 13.3 C | -0.98 C |
| 1969 | 13.1 C | -1.15 C |
| 1970 | 13.6 C | -0.61 C |
| 1971 | 14.2 C | -0.04 C |
| 1972 | 13.5 C | -0.79 C |
| 1973 | 14.1 C | -0.14 C |
| 1974 | 13.7 C | -0.54 C |
| 1975 | 13.9 C | -0.40 C |
| 1976 | 12.6 C | -1.66 C |
| 1977 | 13.7 C | -0.53 C |
| 1978 | 13.0 C | -1.25 C |
| 1980 | 13.8 C | -0.48 C |
| 1981 | 13.3 C | -0.91 C |
| 1982 | 14.0 C | -0.22 C |
| 1985 | 14.5 C | +0.29 C |
| 1986 | 15.1 C | +0.81 C |
| 1987 | 15.0 C | +0.76 C |
| 1988 | 14.0 C | -0.29 C |
| 1989 | 13.6 C | -0.63 C |
| 1990 | 15.4 C | +1.18 C |
| 1991 | 15.1 C | +0.88 C |
| 1992 | 14.0 C | -0.23 C |
| 1993 | 14.1 C | -0.16 C |
| 1994 | 14.3 C | +0.02 C |
| 1995 | 14.4 C | +0.11 C |
| 1996 | 13.9 C | -0.31 C |
| 1997 | 13.8 C | -0.44 C |
| 1998 | 15.9 C | +1.68 C |
| 2000 | 14.2 C | -0.02 C |
| 2001 | 14.7 C | +0.40 C |
| 2002 | 14.4 C | +0.19 C |
| 2003 | 13.7 C | -0.52 C |
| 2005 | 14.6 C | +0.39 C |
| 2006 | 14.7 C | +0.41 C |
| 2007 | 15.7 C | +1.46 C |
| 2008 | 13.9 C | -0.34 C |
| 2009 | 14.0 C | -0.30 C |
| 2010 | 14.4 C | +0.15 C |
| 2011 | 14.9 C | +0.67 C |
| 2012 | 15.8 C | +1.52 C |
| 2013 | 13.6 C | -0.63 C |
| 2018 | 14.8 C | +0.52 C |
| 2019 | 14.7 C | +0.48 C |
| 2020 | 14.1 C | -0.13 C |
| 2022 | 14.0 C | -0.22 C |
| 2023 | 15.5 C | +1.25 C |
| 2025 | 15.6 C | +1.34 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1956 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 56 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 (0.1 to 0.3) per decade | 0.3 F (0.1 to 0.5) per decade | 1956 to 2025 | 56 | Rise |
| Mean daily maximum | 0.07 C (-0.04 to 0.18) per decade | 0.1 F (-0.1 to 0.3) per decade | 1956 to 2025 | 56 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (0.1 to 0.4) per decade | 0.4 F (0.2 to 0.7) per decade | 1956 to 2025 | 56 | 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
1955 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 2012 | 36.1 C (97.0 F) | 72 |
| Coldest night (TNn) | -28.3 C (-18.9 F) | 1963 | -16.7 C (1.9 F) | 72 |
| Wettest day (Rx1day) | 204.5 mm (8.1 in) | 1969 | 77.1 mm (3.0 in) | 72 |
| Wettest five days (Rx5day) | 273.8 mm (10.8 in) | 2005 | 117.4 mm (4.6 in) | 72 |
| Longest dry spell (CDD) | 37 days | 1998 | 19 days | 72 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1955 | 36.7 C (98.1 F) |
| 1956 | 37.8 C (100.0 F) |
| 1957 | 36.1 C (97.0 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 35.6 C (96.1 F) |
| 1960 | 36.7 C (98.1 F) |
| 1961 | 34.4 C (93.9 F) |
| 1962 | 37.2 C (99.0 F) |
| 1963 | 35.6 C (96.1 F) |
| 1964 | 37.8 C (100.0 F) |
| 1965 | 36.1 C (97.0 F) |
| 1966 | 37.2 C (99.0 F) |
| 1967 | 34.4 C (93.9 F) |
| 1968 | 35.6 C (96.1 F) |
| 1969 | 35.6 C (96.1 F) |
| 1970 | 34.4 C (93.9 F) |
| 1971 | 36.7 C (98.1 F) |
| 1972 | 35.0 C (95.0 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 34.4 C (93.9 F) |
| 1975 | 34.4 C (93.9 F) |
| 1976 | 34.4 C (93.9 F) |
| 1977 | 37.2 C (99.0 F) |
| 1978 | 35.6 C (96.1 F) |
| 1979 | 33.9 C (93.0 F) |
| 1980 | 38.3 C (100.9 F) |
| 1981 | 34.4 C (93.9 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 37.8 C (100.0 F) |
| 1984 | 33.9 C (93.0 F) |
| 1985 | 38.9 C (102.0 F) |
| 1986 | 37.8 C (100.0 F) |
| 1987 | 37.2 C (99.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 36.7 C (98.1 F) |
| 1992 | 35.0 C (95.0 F) |
| 1993 | 36.7 C (98.1 F) |
| 1994 | 34.4 C (93.9 F) |
| 1995 | 36.1 C (97.0 F) |
| 1996 | 35.6 C (96.1 F) |
| 1997 | 37.8 C (100.0 F) |
| 1998 | 36.1 C (97.0 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 36.7 C (98.1 F) |
| 2001 | 34.4 C (93.9 F) |
| 2002 | 36.1 C (97.0 F) |
| 2003 | 33.9 C (93.0 F) |
| 2004 | 33.9 C (93.0 F) |
| 2005 | 36.7 C (98.1 F) |
| 2006 | 37.2 C (99.0 F) |
| 2007 | 40.6 C (105.1 F) |
| 2008 | 35.6 C (96.1 F) |
| 2009 | 34.4 C (93.9 F) |
| 2010 | 39.4 C (102.9 F) |
| 2011 | 37.2 C (99.0 F) |
| 2012 | 41.1 C (106.0 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 34.4 C (93.9 F) |
| 2015 | 28.9 C (84.0 F) |
| 2016 | 35.6 C (96.1 F) |
| 2017 | 37.2 C (99.0 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 36.7 C (98.1 F) |
| 2020 | 35.6 C (96.1 F) |
| 2021 | 35.6 C (96.1 F) |
| 2022 | 37.2 C (99.0 F) |
| 2023 | 36.1 C (97.0 F) |
| 2024 | 37.8 C (100.0 F) |
| 2025 | 36.1 C (97.0 F) |
| 2026 | 37.2 C (99.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1955 | -12.8 C (9.0 F) |
| 1956 | -9.4 C (15.1 F) |
| 1957 | -14.4 C (6.1 F) |
| 1958 | -22.2 C (-8.0 F) |
| 1959 | -18.3 C (-0.9 F) |
| 1960 | -18.3 C (-0.9 F) |
| 1961 | -21.1 C (-6.0 F) |
| 1962 | -21.1 C (-6.0 F) |
| 1963 | -28.3 C (-18.9 F) |
| 1964 | -17.8 C (0.0 F) |
| 1965 | -22.8 C (-9.0 F) |
| 1966 | -26.1 C (-15.0 F) |
| 1967 | -17.8 C (0.0 F) |
| 1968 | -18.3 C (-0.9 F) |
| 1969 | -18.3 C (-0.9 F) |
| 1970 | -23.9 C (-11.0 F) |
| 1971 | -16.7 C (1.9 F) |
| 1972 | -20.6 C (-5.1 F) |
| 1973 | -17.8 C (0.0 F) |
| 1974 | -12.2 C (10.0 F) |
| 1975 | -12.8 C (9.0 F) |
| 1976 | -17.8 C (0.0 F) |
| 1977 | -23.3 C (-9.9 F) |
| 1978 | -16.7 C (1.9 F) |
| 1979 | -21.1 C (-6.0 F) |
| 1980 | -13.3 C (8.1 F) |
| 1981 | -18.9 C (-2.0 F) |
| 1982 | -25.6 C (-14.1 F) |
| 1983 | -21.7 C (-7.1 F) |
| 1984 | -25.0 C (-13.0 F) |
| 1985 | -27.2 C (-17.0 F) |
| 1986 | -17.2 C (1.0 F) |
| 1987 | -12.2 C (10.0 F) |
| 1988 | -16.1 C (3.0 F) |
| 1989 | -25.6 C (-14.1 F) |
| 1990 | -13.3 C (8.1 F) |
| 1991 | -13.3 C (8.1 F) |
| 1992 | -13.3 C (8.1 F) |
| 1993 | -13.3 C (8.1 F) |
| 1994 | -22.8 C (-9.0 F) |
| 1995 | -14.4 C (6.1 F) |
| 1996 | -20.0 C (-4.0 F) |
| 1997 | -17.2 C (1.0 F) |
| 1998 | -10.6 C (12.9 F) |
| 1999 | -11.1 C (12.0 F) |
| 2000 | -16.1 C (3.0 F) |
| 2001 | -14.4 C (6.1 F) |
| 2002 | -12.2 C (10.0 F) |
| 2003 | -18.9 C (-2.0 F) |
| 2004 | -14.4 C (6.1 F) |
| 2005 | -12.2 C (10.0 F) |
| 2006 | -12.8 C (9.0 F) |
| 2007 | -12.8 C (9.0 F) |
| 2008 | -14.4 C (6.1 F) |
| 2009 | -16.7 C (1.9 F) |
| 2010 | -16.1 C (3.0 F) |
| 2011 | -15.6 C (3.9 F) |
| 2012 | -9.4 C (15.1 F) |
| 2013 | -10.6 C (12.9 F) |
| 2014 | -18.9 C (-2.0 F) |
| 2015 | -21.1 C (-6.0 F) |
| 2016 | -10.0 C (14.0 F) |
| 2017 | -13.9 C (7.0 F) |
| 2018 | -17.2 C (1.0 F) |
| 2019 | -12.2 C (10.0 F) |
| 2020 | -10.6 C (12.9 F) |
| 2021 | -14.4 C (6.1 F) |
| 2022 | -20.6 C (-5.1 F) |
| 2023 | -7.8 C (18.0 F) |
| 2024 | -18.3 C (-0.9 F) |
| 2025 | -14.4 C (6.1 F) |
| 2026 | -15.6 C (3.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1955 | 36.3 mm (1.4 in) |
| 1956 | 84.3 mm (3.3 in) |
| 1957 | 81.3 mm (3.2 in) |
| 1958 | 59.7 mm (2.4 in) |
| 1959 | 60.7 mm (2.4 in) |
| 1960 | 59.2 mm (2.3 in) |
| 1961 | 50.3 mm (2.0 in) |
| 1962 | 88.9 mm (3.5 in) |
| 1963 | 59.7 mm (2.4 in) |
| 1964 | 65.5 mm (2.6 in) |
| 1965 | 61.7 mm (2.4 in) |
| 1966 | 57.9 mm (2.3 in) |
| 1967 | 66.8 mm (2.6 in) |
| 1968 | 101.6 mm (4.0 in) |
| 1969 | 204.5 mm (8.1 in) |
| 1970 | 50.8 mm (2.0 in) |
| 1971 | 88.9 mm (3.5 in) |
| 1972 | 90.2 mm (3.6 in) |
| 1973 | 114.0 mm (4.5 in) |
| 1974 | 104.6 mm (4.1 in) |
| 1975 | 109.0 mm (4.3 in) |
| 1976 | 74.7 mm (2.9 in) |
| 1977 | 80.5 mm (3.2 in) |
| 1978 | 101.6 mm (4.0 in) |
| 1979 | 150.9 mm (5.9 in) |
| 1980 | 72.1 mm (2.8 in) |
| 1981 | 77.5 mm (3.1 in) |
| 1982 | 55.9 mm (2.2 in) |
| 1983 | 54.4 mm (2.1 in) |
| 1984 | 81.0 mm (3.2 in) |
| 1985 | 42.9 mm (1.7 in) |
| 1986 | 73.4 mm (2.9 in) |
| 1987 | 80.5 mm (3.2 in) |
| 1988 | 58.2 mm (2.3 in) |
| 1989 | 90.4 mm (3.6 in) |
| 1990 | 79.0 mm (3.1 in) |
| 1991 | 78.2 mm (3.1 in) |
| 1992 | 78.0 mm (3.1 in) |
| 1993 | 57.4 mm (2.3 in) |
| 1994 | 67.3 mm (2.6 in) |
| 1995 | 87.6 mm (3.4 in) |
| 1996 | 76.5 mm (3.0 in) |
| 1997 | 88.9 mm (3.5 in) |
| 1998 | 80.5 mm (3.2 in) |
| 1999 | 96.8 mm (3.8 in) |
| 2000 | 72.4 mm (2.9 in) |
| 2001 | 54.1 mm (2.1 in) |
| 2002 | 106.9 mm (4.2 in) |
| 2003 | 73.7 mm (2.9 in) |
| 2004 | 97.8 mm (3.9 in) |
| 2005 | 157.2 mm (6.2 in) |
| 2006 | 62.2 mm (2.4 in) |
| 2007 | 89.7 mm (3.5 in) |
| 2008 | 76.2 mm (3.0 in) |
| 2009 | 96.8 mm (3.8 in) |
| 2010 | 76.7 mm (3.0 in) |
| 2011 | 64.0 mm (2.5 in) |
| 2012 | 73.4 mm (2.9 in) |
| 2013 | 72.4 mm (2.9 in) |
| 2014 | 73.7 mm (2.9 in) |
| 2015 | 54.1 mm (2.1 in) |
| 2016 | 78.7 mm (3.1 in) |
| 2017 | 120.7 mm (4.8 in) |
| 2018 | 59.4 mm (2.3 in) |
| 2019 | 83.8 mm (3.3 in) |
| 2020 | 58.4 mm (2.3 in) |
| 2021 | 73.7 mm (2.9 in) |
| 2022 | 102.1 mm (4.0 in) |
| 2023 | 79.2 mm (3.1 in) |
| 2024 | 158.2 mm (6.2 in) |
| 2025 | 116.6 mm (4.6 in) |
| 2026 | 48.3 mm (1.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1955 | 38.1 mm (1.5 in) |
| 1956 | 165.6 mm (6.5 in) |
| 1957 | 163.0 mm (6.4 in) |
| 1958 | 73.9 mm (2.9 in) |
| 1959 | 107.2 mm (4.2 in) |
| 1960 | 101.3 mm (4.0 in) |
| 1961 | 85.6 mm (3.4 in) |
| 1962 | 179.1 mm (7.1 in) |
| 1963 | 77.0 mm (3.0 in) |
| 1964 | 93.5 mm (3.7 in) |
| 1965 | 99.7 mm (3.9 in) |
| 1966 | 124.2 mm (4.9 in) |
| 1967 | 99.3 mm (3.9 in) |
| 1968 | 145.5 mm (5.7 in) |
| 1969 | 233.2 mm (9.2 in) |
| 1970 | 106.4 mm (4.2 in) |
| 1971 | 108.0 mm (4.3 in) |
| 1972 | 113.5 mm (4.5 in) |
| 1973 | 176.5 mm (6.9 in) |
| 1974 | 137.9 mm (5.4 in) |
| 1975 | 236.3 mm (9.3 in) |
| 1976 | 93.5 mm (3.7 in) |
| 1977 | 81.3 mm (3.2 in) |
| 1978 | 191.0 mm (7.5 in) |
| 1979 | 153.4 mm (6.0 in) |
| 1980 | 99.8 mm (3.9 in) |
| 1981 | 144.0 mm (5.7 in) |
| 1982 | 68.9 mm (2.7 in) |
| 1983 | 75.2 mm (3.0 in) |
| 1984 | 205.5 mm (8.1 in) |
| 1985 | 62.5 mm (2.5 in) |
| 1986 | 116.9 mm (4.6 in) |
| 1987 | 146.1 mm (5.8 in) |
| 1988 | 85.4 mm (3.4 in) |
| 1989 | 132.2 mm (5.2 in) |
| 1990 | 159.1 mm (6.3 in) |
| 1991 | 125.7 mm (4.9 in) |
| 1992 | 92.8 mm (3.7 in) |
| 1993 | 91.1 mm (3.6 in) |
| 1994 | 132.4 mm (5.2 in) |
| 1995 | 149.5 mm (5.9 in) |
| 1996 | 140.0 mm (5.5 in) |
| 1997 | 195.4 mm (7.7 in) |
| 1998 | 149.1 mm (5.9 in) |
| 1999 | 97.2 mm (3.8 in) |
| 2000 | 98.5 mm (3.9 in) |
| 2001 | 130.8 mm (5.1 in) |
| 2002 | 122.4 mm (4.8 in) |
| 2003 | 117.9 mm (4.6 in) |
| 2004 | 108.7 mm (4.3 in) |
| 2005 | 273.8 mm (10.8 in) |
| 2006 | 74.2 mm (2.9 in) |
| 2007 | 95.2 mm (3.7 in) |
| 2008 | 124.3 mm (4.9 in) |
| 2009 | 115.9 mm (4.6 in) |
| 2010 | 97.3 mm (3.8 in) |
| 2011 | 66.8 mm (2.6 in) |
| 2012 | 115.4 mm (4.5 in) |
| 2013 | 116.8 mm (4.6 in) |
| 2014 | 120.6 mm (4.7 in) |
| 2015 | 78.5 mm (3.1 in) |
| 2016 | 170.5 mm (6.7 in) |
| 2017 | 162.9 mm (6.4 in) |
| 2018 | 88.9 mm (3.5 in) |
| 2019 | 125.2 mm (4.9 in) |
| 2020 | 109.5 mm (4.3 in) |
| 2021 | 118.7 mm (4.7 in) |
| 2022 | 126.3 mm (5.0 in) |
| 2023 | 128.5 mm (5.1 in) |
| 2024 | 217.7 mm (8.6 in) |
| 2025 | 200.2 mm (7.9 in) |
| 2026 | 76.7 mm (3.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1955 | 24 days |
| 1956 | 18 days |
| 1957 | 21 days |
| 1958 | 20 days |
| 1959 | 19 days |
| 1960 | 25 days |
| 1961 | 19 days |
| 1962 | 16 days |
| 1963 | 28 days |
| 1964 | 25 days |
| 1965 | 17 days |
| 1966 | 20 days |
| 1967 | 19 days |
| 1968 | 22 days |
| 1969 | 19 days |
| 1970 | 21 days |
| 1971 | 21 days |
| 1972 | 14 days |
| 1973 | 26 days |
| 1974 | 15 days |
| 1975 | 17 days |
| 1976 | 11 days |
| 1977 | 17 days |
| 1978 | 15 days |
| 1979 | 16 days |
| 1980 | 17 days |
| 1981 | 19 days |
| 1982 | 29 days |
| 1983 | 22 days |
| 1984 | 17 days |
| 1985 | 19 days |
| 1986 | 19 days |
| 1987 | 19 days |
| 1988 | 31 days |
| 1989 | 20 days |
| 1990 | 24 days |
| 1991 | 21 days |
| 1992 | 19 days |
| 1993 | 18 days |
| 1994 | 12 days |
| 1995 | 16 days |
| 1996 | 19 days |
| 1997 | 22 days |
| 1998 | 37 days |
| 1999 | 23 days |
| 2000 | 25 days |
| 2001 | 25 days |
| 2002 | 16 days |
| 2003 | 13 days |
| 2004 | 17 days |
| 2005 | 26 days |
| 2006 | 11 days |
| 2007 | 29 days |
| 2008 | 31 days |
| 2009 | 16 days |
| 2010 | 19 days |
| 2011 | 15 days |
| 2012 | 22 days |
| 2013 | 13 days |
| 2014 | 18 days |
| 2015 | 20 days |
| 2016 | 22 days |
| 2017 | 18 days |
| 2018 | 9 days |
| 2019 | 14 days |
| 2020 | 11 days |
| 2021 | 17 days |
| 2022 | 29 days |
| 2023 | 22 days |
| 2024 | 25 days |
| 2025 | 15 days |
| 2026 | 20 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
56 years with a frostAcross 56 years with a frost, the median last spring frost at Portland Sewage Plt falls on 10 April and the median first autumn frost on 27 October, which leaves a median of 202 days between them.
Fitted over all years, the growing season changes by +2.9 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1988 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 10 April | n/a | 5 April | n/a | -1.1 days per decade |
| First autumn frost | 27 October | n/a | 29 October | n/a | +1.8 days per decade |
| Growing days | 202 days | n/a | 209 days | n/a | +2.9 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
64 years, 1956 to 2025A day with at least 77.8 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 187.9 mm (7.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 77.8 mm (3.1 in) | |
| 5 years | 100.4 mm (4.0 in) | |
| 10 years | 117.8 mm (4.6 in) | |
| 25 years | 143.0 mm (5.6 in) | |
| 50 years | 164.3 mm (6.5 in) | |
| 100 years | 187.9 mm (7.4 in) | Longer than the 64 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, 64 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: 204.5 mm (8.1 in) in 1969; 158.2 mm (6.2 in) in 2024; 157.2 mm (6.2 in) in 2005.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2005 to 2025 against 1961 to 1990Over 2005 to 2025, Portland Sewage Plt had a mean temperature of 14.7 C (58.4 F) and 1,384.9 mm (54.5 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Mt Pleasant 1N (United States, 130 km away), Holly Springs 4 N (United States, 328 km away) and Selmer (United States, 245 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Mt Pleasant 1N | United States | 130 km (81 mi) | 14.5 C (58.1 F) | 1,379.6 mm (54.3 in) | 0.57 |
| Holly Springs 4 N | United States | 328 km (204 mi) | 14.9 C (58.8 F) | 1,428.2 mm (56.2 in) | 0.61 |
| Selmer | United States | 245 km (152 mi) | 14.6 C (58.3 F) | 1,407.7 mm (55.4 in) | 0.62 |
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).