Hartford Wwtp Weather Records (USC00473453)
Record envelope, standing records and threshold days for Hartford Wwtp (USC00473453), Wisconsin, United States, with 134 years of record.
Key Facts for Hartford Wwtp
- Hartford Wwtp (USC00473453) is a weather station in Wisconsin, United States at 43.33 latitude and -88.41 longitude, 293 m (961 ft) above sea level.
- The station reports from 1893 to 2026, 134 years of record.
- 1,464 records set at Hartford Wwtp still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Hartford Wwtp set a daily record precipitation of 26.2 mm (1.0 in) on 1 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Wisconsin, United States, 43.33 latitude, -88.41 longitude.
- Elevation: 293 m (961 ft).
- Period of record: 1893 to 2026, 134 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
5 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 12.8 C (55.0 F) | -37.2 C (-35.0 F) | 12.8 C (55.0 F) | -28.9 C (-20.0 F) |
| Feb | 20.6 C (69.1 F) | -36.7 C (-34.1 F) | 15.0 C (59.0 F) | -21.1 C (-6.0 F) |
| Mar | 28.3 C (82.9 F) | -30.6 C (-23.1 F) | 24.4 C (75.9 F) | -15.0 C (5.0 F) |
| Apr | 31.1 C (88.0 F) | -17.2 C (1.0 F) | 26.7 C (80.1 F) | -7.2 C (19.0 F) |
| May | 34.4 C (93.9 F) | -6.7 C (19.9 F) | 30.6 C (87.1 F) | -2.8 C (27.0 F) |
| Jun | 37.8 C (100.0 F) | -0.6 C (30.9 F) | 33.3 C (91.9 F) | 6.1 C (43.0 F) |
| Jul | 40.6 C (105.1 F) | 3.9 C (39.0 F) | 33.9 C (93.0 F) | 7.8 C (46.0 F) |
| Aug | 38.3 C (100.9 F) | 2.2 C (36.0 F) | 28.3 C (82.9 F) | 8.3 C (46.9 F) |
| Sep | 36.1 C (97.0 F) | -5.0 C (23.0 F) | 30.6 C (87.1 F) | 5.6 C (42.1 F) |
| Oct | 31.7 C (89.1 F) | -12.8 C (9.0 F) | 27.8 C (82.0 F) | 2.8 C (37.0 F) |
| Nov | 23.9 C (75.0 F) | -23.9 C (-11.0 F) | n/a | n/a |
| Dec | 18.3 C (64.9 F) | -33.9 C (-29.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1897 | 28 |
| 1898 | 19 |
| 1899 | 36 |
| 1900 | 32 |
| 1901 | 2 |
| 1953 | 18 |
| 1954 | 13 |
| 1955 | 25 |
| 1956 | 12 |
| 1957 | 12 |
| 1958 | 16 |
| 1959 | 31 |
| 1960 | 23 |
| 1961 | 10 |
| 1962 | 19 |
| 1963 | 34 |
| 1964 | 31 |
| 1965 | 27 |
| 1966 | 19 |
| 1967 | 20 |
| 1968 | 17 |
| 1969 | 14 |
| 1970 | 14 |
| 1971 | 13 |
| 1972 | 17 |
| 1973 | 9 |
| 1974 | 22 |
| 1975 | 18 |
| 1976 | 33 |
| 1977 | 21 |
| 1978 | 10 |
| 1979 | 20 |
| 1980 | 14 |
| 1981 | 11 |
| 1982 | 29 |
| 1983 | 21 |
| 1984 | 19 |
| 1985 | 20 |
| 1986 | 20 |
| 1987 | 20 |
| 1988 | 31 |
| 1989 | 20 |
| 1990 | 20 |
| 1991 | 30 |
| 1992 | 26 |
| 1993 | 14 |
| 1994 | 18 |
| 1995 | 16 |
| 1996 | 17 |
| 1997 | 8 |
| 1998 | 23 |
| 1999 | 35 |
| 2000 | 18 |
| 2001 | 19 |
| 2002 | 19 |
| 2003 | 11 |
| 2004 | 13 |
| 2005 | 14 |
| 2006 | 12 |
| 2007 | 21 |
| 2008 | 14 |
| 2009 | 13 |
| 2010 | 8 |
| 2011 | 9 |
| 2012 | 35 |
| 2013 | 11 |
| 2014 | 24 |
| 2015 | 14 |
| 2016 | 6 |
| 2017 | 27 |
| 2018 | 12 |
| 2019 | 25 |
| 2020 | 12 |
| 2021 | 14 |
| 2022 | 14 |
| 2023 | 19 |
| 2024 | 10 |
| 2025 | 11 |
| 2026 | 12 |
All-Time Record Progression
8 new records| Date | Kind | Detail |
|---|---|---|
| 1983-08-17 | Record daily precipitation | Record daily precipitation 100.6 mm (4.0 in) |
| 1986-09-10 | Record daily precipitation | Record daily precipitation 132.1 mm (5.2 in) |
| 1988-06-21 | Record high maximum temperature | Record high maximum temperature 37.8 C (100.0 F) |
| 1988-08-01 | Record high maximum temperature | Record high maximum temperature 38.3 C (100.9 F) |
| 1988-08-01 | Record high minimum temperature | Record high minimum temperature 25.0 C (77.0 F) |
| 1988-08-16 | Record high minimum temperature | Record high minimum temperature 25.6 C (78.1 F) |
| 1994-01-19 | Record low maximum temperature | Record low maximum temperature -27.8 C (-18.0 F) |
| 1999-07-31 | Record high maximum temperature | Record high maximum temperature 40.6 C (105.1 F) |
Wettest Day of Each Month
Sep: 132.1 mm (5.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 50.8 mm (2.0 in) | 23 January 1988 |
| Feb | 45.7 mm (1.8 in) | 21 February 1997 |
| Mar | 53.3 mm (2.1 in) | 31 March 1998 |
| Apr | 67.8 mm (2.7 in) | 20 April 2023 |
| May | 69.3 mm (2.7 in) | 18 May 2000 |
| Jun | 125.7 mm (4.9 in) | 8 June 2008 |
| Jul | 100.3 mm (3.9 in) | 21 July 1999 |
| Aug | 116.8 mm (4.6 in) | 27 August 2018 |
| Sep | 132.1 mm (5.2 in) | 10 September 1986 |
| Oct | 107.2 mm (4.2 in) | 2 October 2019 |
| Nov | 67.8 mm (2.7 in) | 4 November 2003 |
| Dec | 41.7 mm (1.6 in) | 15 December 1893 |
Period of Record Coverage
1897 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1897 | 177 | 48% | No |
| 1898 | 283 | 78% | No |
| 1899 | 359 | 98% | Yes |
| 1900 | 334 | 92% | Yes |
| 1901 | 52 | 14% | No |
| 1953 | 183 | 50% | No |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 365 | 100% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 364 | 99% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 361 | 99% | Yes |
| 1983 | 361 | 99% | Yes |
| 1984 | 364 | 99% | Yes |
| 1985 | 360 | 99% | Yes |
| 1986 | 364 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 364 | 99% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 364 | 99% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 364 | 100% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 358 | 98% | Yes |
| 1999 | 361 | 99% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 361 | 99% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 362 | 99% | Yes |
| 2004 | 364 | 99% | Yes |
| 2005 | 363 | 99% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 362 | 99% | Yes |
| 2008 | 364 | 99% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 361 | 99% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 363 | 99% | Yes |
| 2016 | 365 | 100% | Yes |
| 2017 | 363 | 99% | Yes |
| 2018 | 362 | 99% | Yes |
| 2019 | 362 | 99% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 362 | 99% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 362 | 99% | Yes |
| 2024 | 362 | 99% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 1 October 2026 | Hartford Wwtp, US | daily rain (Provisional) | 26.2 mm (1.0 in) | 4.4 mm (0.17 in) | 8 years | 16 of 100 (Routine) |
| 4 September 2026 | Hartford Wwtp, US | daily rain (Provisional) | 55.1 mm (2.2 in) | 22.1 mm (0.9 in) | 72 years | 47 of 100 (Notable) |
| 1 August 2026 | Hartford Wwtp, US | daily rain | 57.4 mm (2.3 in) | 2.8 mm (0.11 in) | 128 years | 42 of 100 (Notable) |
| 28 July 2026 | Hartford Wwtp, US | daily rain | 54.6 mm (2.1 in) | 19.3 mm (0.8 in) | 15 years | 28 of 100 (Routine) |
| 1 July 2026 | Hartford Wwtp, US | monthly high min (Tie) | 24.4 C (75.9 F) | tie | 56 years | 9 of 100 (Routine) |
| 30 June 2026 | Hartford Wwtp, US | daily high min | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 56 years | 27 of 100 (Routine) |
| 18 June 2026 | Hartford Wwtp, US | daily low max | 16.1 C (61.0 F) | 1.7 C (3.1 F) | 47 years | 27 of 100 (Routine) |
| 2 May 2026 | Hartford Wwtp, US | daily low max (Tie) | 6.7 C (44.1 F) | tie | 3 years | 2 of 100 (Routine) |
| 18 April 2026 | Hartford Wwtp, US | daily rain | 35.1 mm (1.4 in) | 13.5 mm (0.5 in) | 12 years | 27 of 100 (Routine) |
| 15 April 2026 | Hartford Wwtp, US | daily rain | 40.6 mm (1.6 in) | 12.9 mm (0.5 in) | 32 years | 33 of 100 (Routine) |
| 15 April 2026 | Hartford Wwtp, US | daily high min | 13.3 C (55.9 F) | 0.5 C (0.9 F) | 49 years | 25 of 100 (Routine) |
| 13 April 2026 | Hartford Wwtp, US | daily high min | 14.4 C (57.9 F) | 2.2 C (4.0 F) | 3 years | 14 of 100 (Routine) |
| 16 March 2026 | Hartford Wwtp, US | daily snowfall | 18.5 cm (7.3 in) | 8.3 cm (3.3 in) | 52 years | 40 of 100 (Notable) |
| 16 March 2026 | Hartford Wwtp, US | daily rain | 29.2 mm (1.1 in) | 9.1 mm (0.36 in) | 9 years | 25 of 100 (Routine) |
| 10 March 2026 | Hartford Wwtp, US | daily high max | 20.6 C (69.1 F) | 3.4 C (6.1 F) | 4 years | 16 of 100 (Routine) |
| 7 March 2026 | Hartford Wwtp, US | daily rain | 40.9 mm (1.6 in) | 22.6 mm (0.9 in) | 52 years | 57 of 100 (Notable) |
| 17 February 2026 | Hartford Wwtp, US | daily high max | 15.0 C (59.0 F) | 1.1 C (2.0 F) | 44 years | 24 of 100 (Routine) |
| 25 January 2026 | Hartford Wwtp, US | daily low max | -17.2 C (1.0 F) | 1.1 C (2.0 F) | 63 years | 29 of 100 (Routine) |
| 24 January 2026 | Hartford Wwtp, US | daily low max | -23.3 C (-9.9 F) | 7.2 C (13.0 F) | 63 years | 39 of 100 (Notable) |
| 24 January 2026 | Hartford Wwtp, US | daily low min | -28.9 C (-20.0 F) | 2.2 C (4.0 F) | 63 years | 30 of 100 (Routine) |
Climate Trend
73 complete years, 1899 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1899 | 8.0 C | +0.47 C |
| 1954 | 8.6 C | +1.04 C |
| 1955 | 8.5 C | +0.94 C |
| 1956 | 8.2 C | +0.67 C |
| 1957 | 8.1 C | +0.56 C |
| 1958 | 7.7 C | +0.13 C |
| 1959 | 7.9 C | +0.32 C |
| 1960 | 7.7 C | +0.20 C |
| 1961 | 8.5 C | +0.92 C |
| 1962 | 7.6 C | +0.08 C |
| 1963 | 7.6 C | +0.05 C |
| 1964 | 8.8 C | +1.26 C |
| 1965 | 7.8 C | +0.24 C |
| 1966 | 7.5 C | -0.06 C |
| 1967 | 7.3 C | -0.24 C |
| 1968 | 8.4 C | +0.85 C |
| 1969 | 7.5 C | -0.05 C |
| 1970 | 7.7 C | +0.21 C |
| 1971 | 7.8 C | +0.22 C |
| 1972 | 6.7 C | -0.82 C |
| 1973 | 8.6 C | +1.10 C |
| 1974 | 7.3 C | -0.21 C |
| 1975 | 7.9 C | +0.33 C |
| 1976 | 6.7 C | -0.85 C |
| 1977 | 7.4 C | -0.14 C |
| 1978 | 6.5 C | -1.08 C |
| 1979 | 6.2 C | -1.34 C |
| 1980 | 7.2 C | -0.37 C |
| 1981 | 7.7 C | +0.13 C |
| 1982 | 6.6 C | -0.93 C |
| 1983 | 7.6 C | +0.02 C |
| 1984 | 7.6 C | +0.07 C |
| 1985 | 7.1 C | -0.41 C |
| 1986 | 7.2 C | -0.29 C |
| 1987 | 8.9 C | +1.35 C |
| 1988 | 7.4 C | -0.17 C |
| 1989 | 5.9 C | -1.63 C |
| 1990 | 7.9 C | +0.40 C |
| 1991 | 7.7 C | +0.18 C |
| 1992 | 6.7 C | -0.79 C |
| 1993 | 6.6 C | -0.89 C |
| 1994 | 6.8 C | -0.74 C |
| 1995 | 6.8 C | -0.75 C |
| 1996 | 5.8 C | -1.78 C |
| 1997 | 6.8 C | -0.72 C |
| 1998 | 10.5 C | +2.96 C |
| 1999 | 9.3 C | +1.73 C |
| 2000 | 7.7 C | +0.16 C |
| 2001 | 8.3 C | +0.78 C |
| 2002 | 8.0 C | +0.50 C |
| 2003 | 7.1 C | -0.39 C |
| 2004 | 7.4 C | -0.09 C |
| 2005 | 8.0 C | +0.45 C |
| 2006 | 8.3 C | +0.76 C |
| 2007 | 7.7 C | +0.16 C |
| 2008 | 6.3 C | -1.20 C |
| 2009 | 6.4 C | -1.11 C |
| 2010 | 8.0 C | +0.48 C |
| 2011 | 6.7 C | -0.88 C |
| 2012 | 8.8 C | +1.22 C |
| 2013 | 6.0 C | -1.58 C |
| 2014 | 5.2 C | -2.32 C |
| 2015 | 7.4 C | -0.11 C |
| 2016 | 8.4 C | +0.90 C |
| 2017 | 7.4 C | -0.18 C |
| 2018 | 6.7 C | -0.86 C |
| 2019 | 6.7 C | -0.81 C |
| 2020 | 7.5 C | -0.05 C |
| 2021 | 7.9 C | +0.39 C |
| 2022 | 6.7 C | -0.87 C |
| 2023 | 8.6 C | +1.07 C |
| 2024 | 9.0 C | +1.51 C |
| 2025 | 7.5 C | -0.08 C |
The fitted trend in annual mean temperature here over 1899 to 2025 is -0.06 C (-0.15 to 0.03) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.12 F (-0.28 to 0.05) per decade. The slope is a straight line fitted to 73 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.06 C (-0.15 to 0.03) per decade | -0.12 F (-0.28 to 0.05) per decade | 1899 to 2025 | 73 | Not clearly different from zero |
| Mean daily maximum | -0.12 C (-0.22 to -0.03) per decade | -0.22 F (-0.39 to -0.05) per decade | 1899 to 2025 | 73 | Fall |
| Mean daily minimum | -0.01 C (-0.10 to 0.09) per decade | -0.01 F (-0.19 to 0.16) per decade | 1899 to 2025 | 73 | Not clearly different from zero |
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
1893 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.6 C (105.1 F) | 1999 | 34.4 C (93.9 F) | 79 |
| Coldest night (TNn) | -37.2 C (-35.0 F) | 1979 | -27.2 C (-17.0 F) | 79 |
| Wettest day (Rx1day) | 132.1 mm (5.2 in) | 1986 | 54.6 mm (2.1 in) | 87 |
| Wettest five days (Rx5day) | 253.0 mm (10.0 in) | 2008 | 84.6 mm (3.3 in) | 87 |
| Longest dry spell (CDD) | 40 days | 1995 | 20 days | 87 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1893 | n/a |
| 1894 | n/a |
| 1895 | n/a |
| 1896 | n/a |
| 1897 | 36.7 C (98.1 F) |
| 1898 | 32.8 C (91.0 F) |
| 1899 | 35.6 C (96.1 F) |
| 1900 | 36.7 C (98.1 F) |
| 1901 | 8.3 C (46.9 F) |
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1953 | 36.1 C (97.0 F) |
| 1954 | 33.9 C (93.0 F) |
| 1955 | 36.7 C (98.1 F) |
| 1956 | 33.9 C (93.0 F) |
| 1957 | 33.9 C (93.0 F) |
| 1958 | 33.9 C (93.0 F) |
| 1959 | 35.0 C (95.0 F) |
| 1960 | 32.8 C (91.0 F) |
| 1961 | 34.4 C (93.9 F) |
| 1962 | 34.4 C (93.9 F) |
| 1963 | 35.6 C (96.1 F) |
| 1964 | 35.6 C (96.1 F) |
| 1965 | 35.0 C (95.0 F) |
| 1966 | 36.1 C (97.0 F) |
| 1967 | 32.2 C (90.0 F) |
| 1968 | 34.4 C (93.9 F) |
| 1969 | 33.3 C (91.9 F) |
| 1970 | 35.0 C (95.0 F) |
| 1971 | 33.9 C (93.0 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 35.0 C (95.0 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 32.8 C (91.0 F) |
| 1976 | 37.2 C (99.0 F) |
| 1977 | 35.0 C (95.0 F) |
| 1978 | 34.4 C (93.9 F) |
| 1979 | 31.1 C (88.0 F) |
| 1980 | 35.0 C (95.0 F) |
| 1981 | 32.8 C (91.0 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 35.6 C (96.1 F) |
| 1985 | 35.0 C (95.0 F) |
| 1986 | 35.0 C (95.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 38.3 C (100.9 F) |
| 1989 | 33.9 C (93.0 F) |
| 1990 | 33.3 C (91.9 F) |
| 1991 | 33.9 C (93.0 F) |
| 1992 | 31.7 C (89.1 F) |
| 1993 | 31.1 C (88.0 F) |
| 1994 | 35.0 C (95.0 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 33.9 C (93.0 F) |
| 1997 | 32.8 C (91.0 F) |
| 1998 | 32.8 C (91.0 F) |
| 1999 | 40.6 C (105.1 F) |
| 2000 | 31.7 C (89.1 F) |
| 2001 | 36.1 C (97.0 F) |
| 2002 | 36.1 C (97.0 F) |
| 2003 | 33.9 C (93.0 F) |
| 2004 | 31.7 C (89.1 F) |
| 2005 | 35.6 C (96.1 F) |
| 2006 | 34.4 C (93.9 F) |
| 2007 | 34.4 C (93.9 F) |
| 2008 | 33.9 C (93.0 F) |
| 2009 | 33.9 C (93.0 F) |
| 2010 | 32.8 C (91.0 F) |
| 2011 | 35.0 C (95.0 F) |
| 2012 | 38.3 C (100.9 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 31.7 C (89.1 F) |
| 2015 | 31.7 C (89.1 F) |
| 2016 | 32.2 C (90.0 F) |
| 2017 | 33.3 C (91.9 F) |
| 2018 | 34.4 C (93.9 F) |
| 2019 | 32.8 C (91.0 F) |
| 2020 | 32.2 C (90.0 F) |
| 2021 | 32.8 C (91.0 F) |
| 2022 | 35.0 C (95.0 F) |
| 2023 | 35.6 C (96.1 F) |
| 2024 | 32.8 C (91.0 F) |
| 2025 | 33.3 C (91.9 F) |
| 2026 | 33.9 C (93.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1893 | n/a |
| 1894 | n/a |
| 1895 | n/a |
| 1896 | n/a |
| 1897 | -16.1 C (3.0 F) |
| 1898 | -23.3 C (-9.9 F) |
| 1899 | -32.8 C (-27.0 F) |
| 1900 | -25.6 C (-14.1 F) |
| 1901 | -28.3 C (-18.9 F) |
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1953 | -18.9 C (-2.0 F) |
| 1954 | -27.2 C (-17.0 F) |
| 1955 | -25.6 C (-14.1 F) |
| 1956 | -23.9 C (-11.0 F) |
| 1957 | -26.7 C (-16.1 F) |
| 1958 | -26.1 C (-15.0 F) |
| 1959 | -36.7 C (-34.1 F) |
| 1960 | -27.2 C (-17.0 F) |
| 1961 | -24.4 C (-11.9 F) |
| 1962 | -30.6 C (-23.1 F) |
| 1963 | -32.2 C (-26.0 F) |
| 1964 | -23.3 C (-9.9 F) |
| 1965 | -30.0 C (-22.0 F) |
| 1966 | -31.7 C (-25.1 F) |
| 1967 | -30.6 C (-23.1 F) |
| 1968 | -28.9 C (-20.0 F) |
| 1969 | -26.7 C (-16.1 F) |
| 1970 | -28.9 C (-20.0 F) |
| 1971 | -30.0 C (-22.0 F) |
| 1972 | -32.8 C (-27.0 F) |
| 1973 | -24.4 C (-11.9 F) |
| 1974 | -30.0 C (-22.0 F) |
| 1975 | -25.6 C (-14.1 F) |
| 1976 | -33.3 C (-27.9 F) |
| 1977 | -31.7 C (-25.1 F) |
| 1978 | -25.0 C (-13.0 F) |
| 1979 | -37.2 C (-35.0 F) |
| 1980 | -26.1 C (-15.0 F) |
| 1981 | -27.2 C (-17.0 F) |
| 1982 | -37.2 C (-35.0 F) |
| 1983 | -33.9 C (-29.0 F) |
| 1984 | -30.6 C (-23.1 F) |
| 1985 | -35.6 C (-32.1 F) |
| 1986 | -32.2 C (-26.0 F) |
| 1987 | -24.4 C (-11.9 F) |
| 1988 | -28.9 C (-20.0 F) |
| 1989 | -28.9 C (-20.0 F) |
| 1990 | -25.0 C (-13.0 F) |
| 1991 | -28.9 C (-20.0 F) |
| 1992 | -22.8 C (-9.0 F) |
| 1993 | -28.9 C (-20.0 F) |
| 1994 | -36.1 C (-33.0 F) |
| 1995 | -26.1 C (-15.0 F) |
| 1996 | -33.9 C (-29.0 F) |
| 1997 | -27.2 C (-17.0 F) |
| 1998 | -22.8 C (-9.0 F) |
| 1999 | -33.3 C (-27.9 F) |
| 2000 | -32.8 C (-27.0 F) |
| 2001 | -25.6 C (-14.1 F) |
| 2002 | -26.1 C (-15.0 F) |
| 2003 | -23.3 C (-9.9 F) |
| 2004 | -26.7 C (-16.1 F) |
| 2005 | -26.1 C (-15.0 F) |
| 2006 | -28.3 C (-18.9 F) |
| 2007 | -27.8 C (-18.0 F) |
| 2008 | -25.6 C (-14.1 F) |
| 2009 | -31.7 C (-25.1 F) |
| 2010 | -25.6 C (-14.1 F) |
| 2011 | -32.2 C (-26.0 F) |
| 2012 | -22.8 C (-9.0 F) |
| 2013 | -25.6 C (-14.1 F) |
| 2014 | -28.9 C (-20.0 F) |
| 2015 | -25.6 C (-14.1 F) |
| 2016 | -27.2 C (-17.0 F) |
| 2017 | -30.0 C (-22.0 F) |
| 2018 | -26.1 C (-15.0 F) |
| 2019 | -35.0 C (-31.0 F) |
| 2020 | -25.6 C (-14.1 F) |
| 2021 | -27.2 C (-17.0 F) |
| 2022 | -27.8 C (-18.0 F) |
| 2023 | -26.7 C (-16.1 F) |
| 2024 | -24.4 C (-11.9 F) |
| 2025 | -30.6 C (-23.1 F) |
| 2026 | -28.9 C (-20.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1893 | 41.7 mm (1.6 in) |
| 1894 | 65.0 mm (2.6 in) |
| 1895 | 47.0 mm (1.9 in) |
| 1896 | 43.4 mm (1.7 in) |
| 1897 | 54.6 mm (2.1 in) |
| 1898 | 56.4 mm (2.2 in) |
| 1899 | 41.1 mm (1.6 in) |
| 1900 | 45.2 mm (1.8 in) |
| 1901 | 19.3 mm (0.8 in) |
| 1948 | 38.1 mm (1.5 in) |
| 1949 | 55.9 mm (2.2 in) |
| 1950 | 23.6 mm (0.9 in) |
| 1951 | 39.4 mm (1.6 in) |
| 1953 | 40.6 mm (1.6 in) |
| 1954 | 81.3 mm (3.2 in) |
| 1955 | 71.1 mm (2.8 in) |
| 1956 | 45.5 mm (1.8 in) |
| 1957 | 24.4 mm (1.0 in) |
| 1958 | 45.5 mm (1.8 in) |
| 1959 | 38.6 mm (1.5 in) |
| 1960 | 84.3 mm (3.3 in) |
| 1961 | 71.6 mm (2.8 in) |
| 1962 | 36.3 mm (1.4 in) |
| 1963 | 39.9 mm (1.6 in) |
| 1964 | 50.8 mm (2.0 in) |
| 1965 | 92.7 mm (3.6 in) |
| 1966 | 38.6 mm (1.5 in) |
| 1967 | 38.4 mm (1.5 in) |
| 1968 | 66.3 mm (2.6 in) |
| 1969 | 83.8 mm (3.3 in) |
| 1970 | 54.9 mm (2.2 in) |
| 1971 | 41.4 mm (1.6 in) |
| 1972 | 60.5 mm (2.4 in) |
| 1973 | 38.6 mm (1.5 in) |
| 1974 | 55.4 mm (2.2 in) |
| 1975 | 52.1 mm (2.1 in) |
| 1976 | 43.2 mm (1.7 in) |
| 1977 | 66.8 mm (2.6 in) |
| 1978 | 64.0 mm (2.5 in) |
| 1979 | 36.8 mm (1.4 in) |
| 1980 | 67.1 mm (2.6 in) |
| 1981 | 43.2 mm (1.7 in) |
| 1982 | 50.8 mm (2.0 in) |
| 1983 | 100.6 mm (4.0 in) |
| 1984 | 50.3 mm (2.0 in) |
| 1985 | 77.5 mm (3.1 in) |
| 1986 | 132.1 mm (5.2 in) |
| 1987 | 60.5 mm (2.4 in) |
| 1988 | 50.8 mm (2.0 in) |
| 1989 | 49.0 mm (1.9 in) |
| 1990 | 55.9 mm (2.2 in) |
| 1991 | 57.7 mm (2.3 in) |
| 1992 | 35.8 mm (1.4 in) |
| 1993 | 63.2 mm (2.5 in) |
| 1994 | 38.6 mm (1.5 in) |
| 1995 | 58.4 mm (2.3 in) |
| 1996 | 96.5 mm (3.8 in) |
| 1997 | 55.9 mm (2.2 in) |
| 1998 | 53.3 mm (2.1 in) |
| 1999 | 100.3 mm (3.9 in) |
| 2000 | 69.3 mm (2.7 in) |
| 2001 | 59.7 mm (2.4 in) |
| 2002 | 72.4 mm (2.9 in) |
| 2003 | 67.8 mm (2.7 in) |
| 2004 | 63.0 mm (2.5 in) |
| 2005 | 47.0 mm (1.9 in) |
| 2006 | 79.8 mm (3.1 in) |
| 2007 | 50.8 mm (2.0 in) |
| 2008 | 125.7 mm (4.9 in) |
| 2009 | 34.0 mm (1.3 in) |
| 2010 | 99.1 mm (3.9 in) |
| 2011 | 57.4 mm (2.3 in) |
| 2012 | 33.8 mm (1.3 in) |
| 2013 | 36.8 mm (1.4 in) |
| 2014 | 53.3 mm (2.1 in) |
| 2015 | 49.0 mm (1.9 in) |
| 2016 | 40.6 mm (1.6 in) |
| 2017 | 54.9 mm (2.2 in) |
| 2018 | 116.8 mm (4.6 in) |
| 2019 | 107.2 mm (4.2 in) |
| 2020 | 50.0 mm (2.0 in) |
| 2021 | 51.1 mm (2.0 in) |
| 2022 | 76.2 mm (3.0 in) |
| 2023 | 67.8 mm (2.7 in) |
| 2024 | 50.3 mm (2.0 in) |
| 2025 | 64.8 mm (2.6 in) |
| 2026 | 57.4 mm (2.3 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1893 | 52.1 mm (2.1 in) |
| 1894 | 80.7 mm (3.2 in) |
| 1895 | 48.3 mm (1.9 in) |
| 1896 | 64.7 mm (2.5 in) |
| 1897 | 60.8 mm (2.4 in) |
| 1898 | 74.4 mm (2.9 in) |
| 1899 | 97.5 mm (3.8 in) |
| 1900 | 56.9 mm (2.2 in) |
| 1901 | 24.8 mm (1.0 in) |
| 1948 | 38.3 mm (1.5 in) |
| 1949 | 112.6 mm (4.4 in) |
| 1950 | 43.4 mm (1.7 in) |
| 1951 | 53.4 mm (2.1 in) |
| 1953 | 84.6 mm (3.3 in) |
| 1954 | 147.3 mm (5.8 in) |
| 1955 | 88.4 mm (3.5 in) |
| 1956 | 69.9 mm (2.8 in) |
| 1957 | 48.1 mm (1.9 in) |
| 1958 | 69.2 mm (2.7 in) |
| 1959 | 65.8 mm (2.6 in) |
| 1960 | 110.5 mm (4.4 in) |
| 1961 | 144.5 mm (5.7 in) |
| 1962 | 53.3 mm (2.1 in) |
| 1963 | 67.6 mm (2.7 in) |
| 1964 | 95.2 mm (3.7 in) |
| 1965 | 150.7 mm (5.9 in) |
| 1966 | 49.3 mm (1.9 in) |
| 1967 | 89.8 mm (3.5 in) |
| 1968 | 68.8 mm (2.7 in) |
| 1969 | 104.1 mm (4.1 in) |
| 1970 | 90.9 mm (3.6 in) |
| 1971 | 78.0 mm (3.1 in) |
| 1972 | 118.9 mm (4.7 in) |
| 1973 | 54.4 mm (2.1 in) |
| 1974 | 80.7 mm (3.2 in) |
| 1975 | 86.9 mm (3.4 in) |
| 1976 | 98.6 mm (3.9 in) |
| 1977 | 127.6 mm (5.0 in) |
| 1978 | 91.6 mm (3.6 in) |
| 1979 | 65.7 mm (2.6 in) |
| 1980 | 116.1 mm (4.6 in) |
| 1981 | 72.1 mm (2.8 in) |
| 1982 | 68.8 mm (2.7 in) |
| 1983 | 100.6 mm (4.0 in) |
| 1984 | 91.5 mm (3.6 in) |
| 1985 | 112.2 mm (4.4 in) |
| 1986 | 157.8 mm (6.2 in) |
| 1987 | 76.6 mm (3.0 in) |
| 1988 | 91.4 mm (3.6 in) |
| 1989 | 74.7 mm (2.9 in) |
| 1990 | 78.8 mm (3.1 in) |
| 1991 | 48.1 mm (1.9 in) |
| 1992 | 66.3 mm (2.6 in) |
| 1993 | 72.1 mm (2.8 in) |
| 1994 | 101.9 mm (4.0 in) |
| 1995 | 84.3 mm (3.3 in) |
| 1996 | 116.9 mm (4.6 in) |
| 1997 | 71.4 mm (2.8 in) |
| 1998 | 72.6 mm (2.9 in) |
| 1999 | 153.4 mm (6.0 in) |
| 2000 | 109.2 mm (4.3 in) |
| 2001 | 62.2 mm (2.4 in) |
| 2002 | 91.5 mm (3.6 in) |
| 2003 | 108.7 mm (4.3 in) |
| 2004 | 123.7 mm (4.9 in) |
| 2005 | 87.2 mm (3.4 in) |
| 2006 | 79.8 mm (3.1 in) |
| 2007 | 147.1 mm (5.8 in) |
| 2008 | 253.0 mm (10.0 in) |
| 2009 | 63.9 mm (2.5 in) |
| 2010 | 119.5 mm (4.7 in) |
| 2011 | 95.8 mm (3.8 in) |
| 2012 | 71.2 mm (2.8 in) |
| 2013 | 77.4 mm (3.0 in) |
| 2014 | 147.2 mm (5.8 in) |
| 2015 | 114.1 mm (4.5 in) |
| 2016 | 79.3 mm (3.1 in) |
| 2017 | 61.5 mm (2.4 in) |
| 2018 | 171.1 mm (6.7 in) |
| 2019 | 139.9 mm (5.5 in) |
| 2020 | 79.0 mm (3.1 in) |
| 2021 | 82.2 mm (3.2 in) |
| 2022 | 97.3 mm (3.8 in) |
| 2023 | 89.7 mm (3.5 in) |
| 2024 | 87.6 mm (3.4 in) |
| 2025 | 150.3 mm (5.9 in) |
| 2026 | 112.0 mm (4.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1893 | 5 days |
| 1894 | 20 days |
| 1895 | 20 days |
| 1896 | 17 days |
| 1897 | 24 days |
| 1898 | 22 days |
| 1899 | 29 days |
| 1900 | 19 days |
| 1901 | 11 days |
| 1948 | 18 days |
| 1949 | 16 days |
| 1950 | 8 days |
| 1951 | 15 days |
| 1953 | 22 days |
| 1954 | 19 days |
| 1955 | 27 days |
| 1956 | 29 days |
| 1957 | 24 days |
| 1958 | 29 days |
| 1959 | 28 days |
| 1960 | 23 days |
| 1961 | 23 days |
| 1962 | 16 days |
| 1963 | 16 days |
| 1964 | 24 days |
| 1965 | 20 days |
| 1966 | 25 days |
| 1967 | 24 days |
| 1968 | 30 days |
| 1969 | 26 days |
| 1970 | 24 days |
| 1971 | 15 days |
| 1972 | 19 days |
| 1973 | 15 days |
| 1974 | 15 days |
| 1975 | 17 days |
| 1976 | 26 days |
| 1977 | 24 days |
| 1978 | 24 days |
| 1979 | 29 days |
| 1980 | 18 days |
| 1981 | 29 days |
| 1982 | 18 days |
| 1983 | 15 days |
| 1984 | 21 days |
| 1985 | 11 days |
| 1986 | 20 days |
| 1987 | 23 days |
| 1988 | 19 days |
| 1989 | 22 days |
| 1990 | 15 days |
| 1991 | 24 days |
| 1992 | 13 days |
| 1993 | 25 days |
| 1994 | 14 days |
| 1995 | 40 days |
| 1996 | 31 days |
| 1997 | 15 days |
| 1998 | 24 days |
| 1999 | 26 days |
| 2000 | 16 days |
| 2001 | 21 days |
| 2002 | 28 days |
| 2003 | 30 days |
| 2004 | 20 days |
| 2005 | 18 days |
| 2006 | 18 days |
| 2007 | 28 days |
| 2008 | 17 days |
| 2009 | 24 days |
| 2010 | 21 days |
| 2011 | 15 days |
| 2012 | 25 days |
| 2013 | 18 days |
| 2014 | 23 days |
| 2015 | 27 days |
| 2016 | 20 days |
| 2017 | 15 days |
| 2018 | 20 days |
| 2019 | 18 days |
| 2020 | 20 days |
| 2021 | 18 days |
| 2022 | 21 days |
| 2023 | 14 days |
| 2024 | 22 days |
| 2025 | 22 days |
| 2026 | 18 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
73 years with a frostAcross 73 years with a frost, the median last spring frost at Hartford Wwtp falls on 10 May and the median first autumn frost on 3 October, which leaves a median of 148 days between them.
In 1996 to 2025 the median growing season was 157 days. That is 12 days more than in 1899 to 1982.
Fitted over all years, the growing season changes by +2.1 days per decade at this station.
| Measure | Median, all years | Earliest period (1899 to 1982) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 10 May | 13 May | 5 May | 8 days earlier | -0.5 days per decade |
| First autumn frost | 3 October | 29 September | 8 October | 9 days later | +1.6 days per decade |
| Growing days | 148 days | 145 days | 157 days | 12 days more | +2.1 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
73 years, 1895 to 2025A day with at least 55.9 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 143.6 mm (5.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 55.9 mm (2.2 in) | |
| 5 years | 75.3 mm (3.0 in) | |
| 10 years | 89.7 mm (3.5 in) | |
| 25 years | 109.7 mm (4.3 in) | |
| 50 years | 126.0 mm (5.0 in) | |
| 100 years | 143.6 mm (5.7 in) | Longer than the 73 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, 73 years of values from 1895 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: 132.1 mm (5.2 in) in 1986; 125.7 mm (4.9 in) in 2008; 116.8 mm (4.6 in) in 2018.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Hartford Wwtp, at 2011. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2011 ran 0.4 C (0.7 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2011 | -0.4 | -0.7 | 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, Hartford Wwtp had a mean temperature of 7.4 C (45.2 F) and 915.6 mm (36.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Hanover (United States, 1,299 km away), Cornwall (United States, 1,223 km away) and Plattsburgh AFB (United States, 1,203 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Hanover | United States | 1,299 km (807 mi) | 7.3 C (45.1 F) | 955.4 mm (37.6 in) | 0.72 |
| Cornwall | United States | 1,223 km (760 mi) | 7.5 C (45.5 F) | 886.0 mm (34.9 in) | 0.72 |
| Plattsburgh AFB | United States | 1,203 km (748 mi) | 7.4 C (45.2 F) | 827.8 mm (32.6 in) | 0.75 |
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).