Rochester Weather Records (USC00196938)
Record envelope, standing records and threshold days for Rochester (USC00196938), Massachusetts, United States, with 127 years of record.
Key Facts for Rochester
- Rochester (USC00196938) is a weather station in Massachusetts, United States at 41.78 latitude and -70.92 longitude, 20 m (65 ft) above sea level.
- The station reports from 1900 to 2026, 127 years of record.
- 1,464 records set at Rochester still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Rochester set a daily record precipitation of 49.5 mm (1.9 in) on 12 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Massachusetts, United States, 41.78 latitude, -70.92 longitude.
- Elevation: 20 m (65 ft).
- Period of record: 1900 to 2026, 127 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
8 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 20.0 C (68.0 F) | -27.8 C (-18.0 F) | 11.1 C (52.0 F) | -20.0 C (-4.0 F) |
| Feb | 20.6 C (69.1 F) | -26.1 C (-15.0 F) | 7.2 C (45.0 F) | -20.0 C (-4.0 F) |
| Mar | 27.8 C (82.0 F) | -22.8 C (-9.0 F) | 19.4 C (66.9 F) | -15.0 C (5.0 F) |
| Apr | 34.4 C (93.9 F) | -12.8 C (9.0 F) | 28.3 C (82.9 F) | -3.9 C (25.0 F) |
| May | 36.1 C (97.0 F) | -4.4 C (24.1 F) | 32.8 C (91.0 F) | 3.3 C (37.9 F) |
| Jun | 38.3 C (100.9 F) | 1.7 C (35.1 F) | 33.3 C (91.9 F) | 4.4 C (39.9 F) |
| Jul | 38.9 C (102.0 F) | 5.6 C (42.1 F) | 36.7 C (98.1 F) | 11.7 C (53.1 F) |
| Aug | 38.3 C (100.9 F) | 1.1 C (34.0 F) | 33.9 C (93.0 F) | 13.3 C (55.9 F) |
| Sep | 36.1 C (97.0 F) | -2.2 C (28.0 F) | 30.0 C (86.0 F) | 9.4 C (48.9 F) |
| Oct | 30.0 C (86.0 F) | -7.8 C (18.0 F) | 26.7 C (80.1 F) | 2.2 C (36.0 F) |
| Nov | 25.0 C (77.0 F) | -13.3 C (8.1 F) | n/a | n/a |
| Dec | 23.9 C (75.0 F) | -24.4 C (-11.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1900 | 25 |
| 1901 | 21 |
| 1951 | 9 |
| 1952 | 15 |
| 1953 | 29 |
| 1954 | 29 |
| 1955 | 20 |
| 1956 | 30 |
| 1957 | 33 |
| 1958 | 22 |
| 1959 | 30 |
| 1960 | 16 |
| 1961 | 23 |
| 1962 | 32 |
| 1963 | 30 |
| 1964 | 31 |
| 1965 | 27 |
| 1966 | 17 |
| 1967 | 32 |
| 1968 | 14 |
| 1969 | 8 |
| 1970 | 16 |
| 1971 | 15 |
| 1972 | 23 |
| 1973 | 12 |
| 1974 | 24 |
| 1975 | 10 |
| 1976 | 21 |
| 1977 | 17 |
| 1978 | 14 |
| 1979 | 29 |
| 1980 | 10 |
| 1981 | 25 |
| 1982 | 19 |
| 1983 | 15 |
| 1984 | 22 |
| 1985 | 14 |
| 1986 | 16 |
| 1987 | 21 |
| 1988 | 20 |
| 1989 | 24 |
| 1990 | 30 |
| 1991 | 28 |
| 1992 | 15 |
| 1993 | 18 |
| 1994 | 16 |
| 1995 | 23 |
| 1996 | 13 |
| 1997 | 7 |
| 1998 | 16 |
| 1999 | 18 |
| 2000 | 20 |
| 2001 | 18 |
| 2002 | 19 |
| 2003 | 12 |
| 2004 | 11 |
| 2005 | 14 |
| 2006 | 12 |
| 2007 | 19 |
| 2008 | 8 |
| 2009 | 16 |
| 2010 | 16 |
| 2011 | 16 |
| 2012 | 25 |
| 2013 | 9 |
| 2014 | 17 |
| 2015 | 26 |
| 2016 | 19 |
| 2017 | 22 |
| 2018 | 16 |
| 2019 | 13 |
| 2020 | 22 |
| 2021 | 14 |
| 2022 | 16 |
| 2023 | 13 |
| 2024 | 7 |
| 2025 | 10 |
| 2026 | 10 |
All-Time Record Progression
9 new records| Date | Kind | Detail |
|---|---|---|
| 1980-12-26 | Record low maximum temperature | Record low maximum temperature -16.7 C (1.9 F) |
| 1982-01-18 | Record low maximum temperature | Record low maximum temperature -18.9 C (-2.0 F) |
| 1990-07-25 | Record daily precipitation | Record daily precipitation 171.5 mm (6.8 in) |
| 1991-07-22 | Record high maximum temperature | Record high maximum temperature 38.9 C (102.0 F) |
| 1996-01-08 | Record snow depth | Record snow depth 63.5 cm (25.0 in) |
| 2005-01-23 | Record daily snowfall | Record daily snowfall 61.0 cm (24.0 in) |
| 2015-02-15 | Record snow depth | Record snow depth 73.7 cm (29.0 in) |
| 2015-02-16 | Record snow depth | Record snow depth 78.7 cm (31.0 in) |
| 2015-02-18 | Record snow depth | Record snow depth 81.3 cm (32.0 in) |
Wettest Day of Each Month
Jul: 171.5 mm (6.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 99.6 mm (3.9 in) | 7 January 1962 |
| Feb | 77.5 mm (3.1 in) | 4 February 1970 |
| Mar | 109.2 mm (4.3 in) | 30 March 2010 |
| Apr | 100.6 mm (4.0 in) | 1 April 1997 |
| May | 99.8 mm (3.9 in) | 26 May 1967 |
| Jun | 139.7 mm (5.5 in) | 3 June 1983 |
| Jul | 171.5 mm (6.8 in) | 25 July 1990 |
| Aug | 148.8 mm (5.9 in) | 9 August 1976 |
| Sep | 162.6 mm (6.4 in) | 2 September 2021 |
| Oct | 96.5 mm (3.8 in) | 15 October 2005 |
| Nov | 98.0 mm (3.9 in) | 2 November 1997 |
| Dec | 115.6 mm (4.6 in) | 27 December 1969 |
Period of Record Coverage
1900 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1900 | 362 | 99% | Yes |
| 1901 | 362 | 99% | Yes |
| 1951 | 32 | 9% | No |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 363 | 99% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 359 | 98% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 360 | 99% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 361 | 99% | Yes |
| 1983 | 364 | 100% | Yes |
| 1984 | 365 | 100% | Yes |
| 1985 | 364 | 100% | Yes |
| 1986 | 363 | 99% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 365 | 100% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 361 | 99% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 305 | 83% | No |
| 1993 | 362 | 99% | Yes |
| 1994 | 363 | 99% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 361 | 99% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 332 | 91% | Yes |
| 1999 | 364 | 100% | Yes |
| 2000 | 362 | 99% | Yes |
| 2001 | 361 | 99% | Yes |
| 2002 | 302 | 83% | No |
| 2003 | 361 | 99% | Yes |
| 2004 | 362 | 99% | Yes |
| 2005 | 331 | 91% | Yes |
| 2006 | 361 | 99% | Yes |
| 2007 | 362 | 99% | Yes |
| 2008 | 363 | 99% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 360 | 99% | Yes |
| 2011 | 303 | 83% | No |
| 2012 | 365 | 100% | Yes |
| 2013 | 364 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 363 | 99% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 364 | 100% | Yes |
| 2018 | 364 | 100% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 359 | 98% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 359 | 98% | Yes |
| 2026 | 270 | 74% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 12 October 2026 | Rochester, US | daily rain (Provisional) | 49.5 mm (1.9 in) | 12.2 mm (0.5 in) | 8 years | 20 of 100 (Routine) |
| 27 September 2026 | Rochester, US | daily rain (Provisional) | 124.0 mm (4.9 in) | 49.3 mm (1.9 in) | 17 years | 43 of 100 (Notable) |
| 14 September 2026 | Rochester, US | daily rain (Provisional) | 99.3 mm (3.9 in) | 59.2 mm (2.3 in) | 39 years | 55 of 100 (Notable) |
| 4 August 2026 | Rochester, US | daily rain | 53.8 mm (2.1 in) | 21.5 mm (0.8 in) | 47 years | 36 of 100 (Notable) |
| 31 July 2026 | Rochester, US | daily low max | 20.6 C (69.1 F) | 1.1 C (2.0 F) | 40 years | 25 of 100 (Routine) |
| 22 July 2026 | Rochester, US | daily rain | 34.5 mm (1.4 in) | 5.8 mm (0.23 in) | 69 years | 33 of 100 (Routine) |
| 4 July 2026 | Rochester, US | daily high min | 25.0 C (77.0 F) | 2.8 C (5.0 F) | 12 years | 21 of 100 (Routine) |
| 4 July 2026 | Rochester, US | daily high max (Tie) | 35.6 C (96.1 F) | tie | 41 years | 5 of 100 (Routine) |
| 3 July 2026 | Rochester, US | daily high max | 36.7 C (98.1 F) | 2.3 C (4.1 F) | 71 years | 37 of 100 (Notable) |
| 3 July 2026 | Rochester, US | daily high min | 23.9 C (75.0 F) | 1.1 C (2.0 F) | 12 years | 16 of 100 (Routine) |
| 23 June 2026 | Rochester, US | daily rain | 70.9 mm (2.8 in) | 41.7 mm (1.6 in) | 16 years | 46 of 100 (Notable) |
| 13 June 2026 | Rochester, US | daily high min | 21.7 C (71.1 F) | 0.6 C (1.1 F) | 20 years | 17 of 100 (Routine) |
| 2 June 2026 | Rochester, US | daily low min (Tie) | 4.4 C (39.9 F) | tie | 72 years | 7 of 100 (Routine) |
| 21 May 2026 | Rochester, US | daily high max (Tie) | 32.8 C (91.0 F) | tie | 29 years | 4 of 100 (Routine) |
| 20 May 2026 | Rochester, US | daily high min | 16.7 C (62.1 F) | 0.6 C (1.1 F) | 56 years | 28 of 100 (Routine) |
| 23 April 2026 | Rochester, US | daily low max (Tie) | 7.2 C (45.0 F) | tie | 61 years | 7 of 100 (Routine) |
| 16 April 2026 | Rochester, US | daily high max | 28.3 C (82.9 F) | 2.7 C (4.9 F) | 65 years | 34 of 100 (Routine) |
| 29 March 2026 | Rochester, US | daily low max | 0.0 C (32.0 F) | 1.1 C (2.0 F) | 4 years | 13 of 100 (Routine) |
| 23 March 2026 | Rochester, US | daily rain | 35.6 mm (1.4 in) | 0.5 mm (0.02 in) | 53 years | 26 of 100 (Routine) |
| 3 March 2026 | Rochester, US | daily low min (Tie) | -15.0 C (5.0 F) | tie | 64 years | 7 of 100 (Routine) |
Climate Trend
71 complete years, 1900 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1900 | 10.9 C | +0.93 C |
| 1901 | 8.5 C | -1.51 C |
| 1952 | 10.2 C | +0.23 C |
| 1953 | 10.6 C | +0.64 C |
| 1954 | 9.6 C | -0.40 C |
| 1955 | 9.5 C | -0.49 C |
| 1956 | 9.1 C | -0.89 C |
| 1957 | 9.7 C | -0.25 C |
| 1958 | 8.4 C | -1.55 C |
| 1959 | 9.6 C | -0.38 C |
| 1960 | 9.1 C | -0.85 C |
| 1961 | 9.2 C | -0.79 C |
| 1962 | 8.1 C | -1.92 C |
| 1963 | 8.9 C | -1.12 C |
| 1964 | 8.8 C | -1.22 C |
| 1965 | 8.5 C | -1.54 C |
| 1966 | 9.1 C | -0.93 C |
| 1967 | 8.7 C | -1.28 C |
| 1968 | 9.0 C | -1.00 C |
| 1969 | 9.4 C | -0.61 C |
| 1970 | 8.9 C | -1.06 C |
| 1971 | 9.3 C | -0.71 C |
| 1972 | 8.5 C | -1.47 C |
| 1973 | 10.1 C | +0.14 C |
| 1974 | 9.2 C | -0.83 C |
| 1975 | 9.9 C | -0.05 C |
| 1976 | 9.2 C | -0.76 C |
| 1977 | 9.6 C | -0.36 C |
| 1978 | 8.8 C | -1.24 C |
| 1979 | 10.0 C | +0.03 C |
| 1980 | 9.4 C | -0.59 C |
| 1981 | 9.5 C | -0.46 C |
| 1982 | 9.5 C | -0.48 C |
| 1983 | 10.7 C | +0.68 C |
| 1984 | 10.5 C | +0.47 C |
| 1985 | 10.0 C | +0.03 C |
| 1986 | 9.8 C | -0.23 C |
| 1987 | 9.8 C | -0.18 C |
| 1988 | 9.8 C | -0.17 C |
| 1989 | 9.5 C | -0.49 C |
| 1990 | 11.3 C | +1.27 C |
| 1991 | 11.7 C | +1.73 C |
| 1993 | 10.4 C | +0.40 C |
| 1994 | 10.7 C | +0.72 C |
| 1995 | 10.5 C | +0.51 C |
| 1996 | 10.2 C | +0.17 C |
| 1997 | 10.3 C | +0.31 C |
| 1999 | 11.6 C | +1.61 C |
| 2000 | 10.3 C | +0.32 C |
| 2001 | 11.2 C | +1.25 C |
| 2003 | 9.9 C | -0.08 C |
| 2004 | 9.8 C | -0.17 C |
| 2006 | 11.4 C | +1.44 C |
| 2007 | 10.3 C | +0.32 C |
| 2008 | 10.5 C | +0.55 C |
| 2009 | 9.9 C | -0.05 C |
| 2010 | 11.1 C | +1.07 C |
| 2012 | 12.0 C | +1.97 C |
| 2013 | 10.7 C | +0.68 C |
| 2014 | 10.0 C | +0.05 C |
| 2015 | 10.3 C | +0.28 C |
| 2016 | 11.0 C | +1.04 C |
| 2017 | 10.5 C | +0.52 C |
| 2018 | 10.6 C | +0.58 C |
| 2019 | 10.1 C | +0.06 C |
| 2020 | 11.3 C | +1.29 C |
| 2021 | 11.1 C | +1.08 C |
| 2022 | 10.9 C | +0.93 C |
| 2023 | 11.4 C | +1.40 C |
| 2024 | 11.0 C | +0.99 C |
| 2025 | 10.3 C | +0.31 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1900 to 2025. In Fahrenheit: 0.4 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 71 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 | 0.4 F (0.2 to 0.5) per decade | 1900 to 2025 | 71 | Rise |
| Mean daily maximum | 0.1 C (0.1 to 0.2) per decade | 0.3 F (0.2 to 0.4) per decade | 1900 to 2025 | 71 | Rise |
| Mean daily minimum | 0.3 C (0.2 to 0.4) per decade | 0.5 F (0.3 to 0.6) per decade | 1900 to 2025 | 71 | 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
1900 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.9 C (102.0 F) | 1991 | 35.0 C (95.0 F) | 78 |
| Coldest night (TNn) | -27.8 C (-18.0 F) | 1961 | -19.1 C (-2.5 F) | 78 |
| Wettest day (Rx1day) | 171.5 mm (6.8 in) | 1990 | 75.1 mm (3.0 in) | 78 |
| Wettest five days (Rx5day) | 199.0 mm (7.8 in) | 1990 | 116.4 mm (4.6 in) | 77 |
| Longest dry spell (CDD) | 37 days | 1995 | 16 days | 78 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1900 | 35.6 C (96.1 F) |
| 1901 | 33.3 C (91.9 F) |
| 1951 | 17.2 C (63.0 F) |
| 1952 | 37.2 C (99.0 F) |
| 1953 | 36.1 C (97.0 F) |
| 1954 | 33.3 C (91.9 F) |
| 1955 | 35.6 C (96.1 F) |
| 1956 | 34.4 C (93.9 F) |
| 1957 | 36.1 C (97.0 F) |
| 1958 | 32.2 C (90.0 F) |
| 1959 | 33.9 C (93.0 F) |
| 1960 | 32.2 C (90.0 F) |
| 1961 | 33.9 C (93.0 F) |
| 1962 | 30.6 C (87.1 F) |
| 1963 | 35.6 C (96.1 F) |
| 1964 | 36.1 C (97.0 F) |
| 1965 | 32.8 C (91.0 F) |
| 1966 | 35.0 C (95.0 F) |
| 1967 | 33.3 C (91.9 F) |
| 1968 | 35.0 C (95.0 F) |
| 1969 | 33.9 C (93.0 F) |
| 1970 | 32.8 C (91.0 F) |
| 1971 | 33.3 C (91.9 F) |
| 1972 | 33.3 C (91.9 F) |
| 1973 | 35.0 C (95.0 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 37.8 C (100.0 F) |
| 1976 | 33.9 C (93.0 F) |
| 1977 | 36.1 C (97.0 F) |
| 1978 | 35.0 C (95.0 F) |
| 1979 | 34.4 C (93.9 F) |
| 1980 | 36.7 C (98.1 F) |
| 1981 | 35.6 C (96.1 F) |
| 1982 | 35.0 C (95.0 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 36.1 C (97.0 F) |
| 1985 | 35.0 C (95.0 F) |
| 1986 | 34.4 C (93.9 F) |
| 1987 | 36.1 C (97.0 F) |
| 1988 | 37.2 C (99.0 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 34.4 C (93.9 F) |
| 1991 | 38.9 C (102.0 F) |
| 1992 | 35.6 C (96.1 F) |
| 1993 | 37.8 C (100.0 F) |
| 1994 | 34.4 C (93.9 F) |
| 1995 | 36.1 C (97.0 F) |
| 1996 | 36.1 C (97.0 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 34.4 C (93.9 F) |
| 1999 | 37.2 C (99.0 F) |
| 2000 | 34.4 C (93.9 F) |
| 2001 | 37.8 C (100.0 F) |
| 2002 | 36.1 C (97.0 F) |
| 2003 | 34.4 C (93.9 F) |
| 2004 | 34.4 C (93.9 F) |
| 2005 | 35.6 C (96.1 F) |
| 2006 | 38.3 C (100.9 F) |
| 2007 | 35.0 C (95.0 F) |
| 2008 | 36.1 C (97.0 F) |
| 2009 | 34.4 C (93.9 F) |
| 2010 | 36.7 C (98.1 F) |
| 2011 | 37.2 C (99.0 F) |
| 2012 | 36.1 C (97.0 F) |
| 2013 | 35.0 C (95.0 F) |
| 2014 | 31.7 C (89.1 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 35.0 C (95.0 F) |
| 2017 | 34.4 C (93.9 F) |
| 2018 | 34.4 C (93.9 F) |
| 2019 | 35.6 C (96.1 F) |
| 2020 | 36.1 C (97.0 F) |
| 2021 | 35.6 C (96.1 F) |
| 2022 | 35.0 C (95.0 F) |
| 2023 | 33.9 C (93.0 F) |
| 2024 | 33.3 C (91.9 F) |
| 2025 | 38.3 C (100.9 F) |
| 2026 | 36.7 C (98.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1900 | -18.3 C (-0.9 F) |
| 1901 | -16.7 C (1.9 F) |
| 1951 | -19.4 C (-2.9 F) |
| 1952 | -17.8 C (0.0 F) |
| 1953 | -14.4 C (6.1 F) |
| 1954 | -26.1 C (-15.0 F) |
| 1955 | -21.7 C (-7.1 F) |
| 1956 | -18.9 C (-2.0 F) |
| 1957 | -26.1 C (-15.0 F) |
| 1958 | -21.1 C (-6.0 F) |
| 1959 | -17.2 C (1.0 F) |
| 1960 | -17.8 C (0.0 F) |
| 1961 | -27.8 C (-18.0 F) |
| 1962 | -21.7 C (-7.1 F) |
| 1963 | -24.4 C (-11.9 F) |
| 1964 | -24.4 C (-11.9 F) |
| 1965 | -25.6 C (-14.1 F) |
| 1966 | -21.1 C (-6.0 F) |
| 1967 | -22.8 C (-9.0 F) |
| 1968 | -21.7 C (-7.1 F) |
| 1969 | -14.4 C (6.1 F) |
| 1970 | -24.4 C (-11.9 F) |
| 1971 | -22.8 C (-9.0 F) |
| 1972 | -18.9 C (-2.0 F) |
| 1973 | -18.3 C (-0.9 F) |
| 1974 | -20.6 C (-5.1 F) |
| 1975 | -19.4 C (-2.9 F) |
| 1976 | -22.8 C (-9.0 F) |
| 1977 | -18.9 C (-2.0 F) |
| 1978 | -21.1 C (-6.0 F) |
| 1979 | -21.7 C (-7.1 F) |
| 1980 | -22.2 C (-8.0 F) |
| 1981 | -23.9 C (-11.0 F) |
| 1982 | -21.7 C (-7.1 F) |
| 1983 | -18.3 C (-0.9 F) |
| 1984 | -24.4 C (-11.9 F) |
| 1985 | -16.1 C (3.0 F) |
| 1986 | -17.8 C (0.0 F) |
| 1987 | -21.1 C (-6.0 F) |
| 1988 | -22.8 C (-9.0 F) |
| 1989 | -19.4 C (-2.9 F) |
| 1990 | -16.7 C (1.9 F) |
| 1991 | -16.1 C (3.0 F) |
| 1992 | -16.1 C (3.0 F) |
| 1993 | -19.4 C (-2.9 F) |
| 1994 | -20.0 C (-4.0 F) |
| 1995 | -17.2 C (1.0 F) |
| 1996 | -18.9 C (-2.0 F) |
| 1997 | -17.8 C (0.0 F) |
| 1998 | -13.3 C (8.1 F) |
| 1999 | -16.7 C (1.9 F) |
| 2000 | -20.0 C (-4.0 F) |
| 2001 | -12.8 C (9.0 F) |
| 2002 | -11.7 C (10.9 F) |
| 2003 | -18.3 C (-0.9 F) |
| 2004 | -22.8 C (-9.0 F) |
| 2005 | -20.6 C (-5.1 F) |
| 2006 | -12.8 C (9.0 F) |
| 2007 | -16.7 C (1.9 F) |
| 2008 | -15.6 C (3.9 F) |
| 2009 | -18.3 C (-0.9 F) |
| 2010 | -15.6 C (3.9 F) |
| 2011 | -18.9 C (-2.0 F) |
| 2012 | -13.3 C (8.1 F) |
| 2013 | -15.6 C (3.9 F) |
| 2014 | -20.6 C (-5.1 F) |
| 2015 | -22.8 C (-9.0 F) |
| 2016 | -22.8 C (-9.0 F) |
| 2017 | -16.7 C (1.9 F) |
| 2018 | -19.4 C (-2.9 F) |
| 2019 | -17.2 C (1.0 F) |
| 2020 | -12.2 C (10.0 F) |
| 2021 | -14.4 C (6.1 F) |
| 2022 | -19.4 C (-2.9 F) |
| 2023 | -22.8 C (-9.0 F) |
| 2024 | -12.2 C (10.0 F) |
| 2025 | -15.6 C (3.9 F) |
| 2026 | -20.0 C (-4.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1900 | 74.4 mm (2.9 in) |
| 1901 | 75.2 mm (3.0 in) |
| 1951 | 53.3 mm (2.1 in) |
| 1952 | 66.0 mm (2.6 in) |
| 1953 | 102.6 mm (4.0 in) |
| 1954 | 108.0 mm (4.3 in) |
| 1955 | 70.1 mm (2.8 in) |
| 1956 | 44.2 mm (1.7 in) |
| 1957 | 57.7 mm (2.3 in) |
| 1958 | 66.8 mm (2.6 in) |
| 1959 | 62.5 mm (2.5 in) |
| 1960 | 109.0 mm (4.3 in) |
| 1961 | 61.7 mm (2.4 in) |
| 1962 | 99.6 mm (3.9 in) |
| 1963 | 49.0 mm (1.9 in) |
| 1964 | 65.5 mm (2.6 in) |
| 1965 | 41.1 mm (1.6 in) |
| 1966 | 70.6 mm (2.8 in) |
| 1967 | 99.8 mm (3.9 in) |
| 1968 | 106.7 mm (4.2 in) |
| 1969 | 115.6 mm (4.6 in) |
| 1970 | 80.0 mm (3.1 in) |
| 1971 | 57.9 mm (2.3 in) |
| 1972 | 77.7 mm (3.1 in) |
| 1973 | 80.8 mm (3.2 in) |
| 1974 | 47.0 mm (1.9 in) |
| 1975 | 64.3 mm (2.5 in) |
| 1976 | 148.8 mm (5.9 in) |
| 1977 | 56.6 mm (2.2 in) |
| 1978 | 113.3 mm (4.5 in) |
| 1979 | 93.7 mm (3.7 in) |
| 1980 | 54.1 mm (2.1 in) |
| 1981 | 42.4 mm (1.7 in) |
| 1982 | 49.8 mm (2.0 in) |
| 1983 | 139.7 mm (5.5 in) |
| 1984 | 75.4 mm (3.0 in) |
| 1985 | 89.9 mm (3.5 in) |
| 1986 | 49.5 mm (1.9 in) |
| 1987 | 57.9 mm (2.3 in) |
| 1988 | 62.7 mm (2.5 in) |
| 1989 | 45.7 mm (1.8 in) |
| 1990 | 171.5 mm (6.8 in) |
| 1991 | 86.9 mm (3.4 in) |
| 1992 | 64.5 mm (2.5 in) |
| 1993 | 59.7 mm (2.4 in) |
| 1994 | 79.8 mm (3.1 in) |
| 1995 | 64.8 mm (2.6 in) |
| 1996 | 92.5 mm (3.6 in) |
| 1997 | 100.6 mm (4.0 in) |
| 1998 | 92.5 mm (3.6 in) |
| 1999 | 77.0 mm (3.0 in) |
| 2000 | 66.0 mm (2.6 in) |
| 2001 | 89.7 mm (3.5 in) |
| 2002 | 57.2 mm (2.3 in) |
| 2003 | 74.9 mm (2.9 in) |
| 2004 | 69.1 mm (2.7 in) |
| 2005 | 104.1 mm (4.1 in) |
| 2006 | 85.6 mm (3.4 in) |
| 2007 | 90.7 mm (3.6 in) |
| 2008 | 86.9 mm (3.4 in) |
| 2009 | 88.9 mm (3.5 in) |
| 2010 | 109.2 mm (4.3 in) |
| 2011 | 62.5 mm (2.5 in) |
| 2012 | 69.1 mm (2.7 in) |
| 2013 | 103.1 mm (4.1 in) |
| 2014 | 119.9 mm (4.7 in) |
| 2015 | 61.0 mm (2.4 in) |
| 2016 | 53.3 mm (2.1 in) |
| 2017 | 52.3 mm (2.1 in) |
| 2018 | 93.2 mm (3.7 in) |
| 2019 | 90.7 mm (3.6 in) |
| 2020 | 60.5 mm (2.4 in) |
| 2021 | 162.6 mm (6.4 in) |
| 2022 | 55.9 mm (2.2 in) |
| 2023 | 52.8 mm (2.1 in) |
| 2024 | 88.1 mm (3.5 in) |
| 2025 | 98.6 mm (3.9 in) |
| 2026 | 124.0 mm (4.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1900 | n/a |
| 1901 | 77.6 mm (3.1 in) |
| 1951 | 75.8 mm (3.0 in) |
| 1952 | 114.3 mm (4.5 in) |
| 1953 | 139.5 mm (5.5 in) |
| 1954 | 132.9 mm (5.2 in) |
| 1955 | 141.7 mm (5.6 in) |
| 1956 | 75.7 mm (3.0 in) |
| 1957 | 94.0 mm (3.7 in) |
| 1958 | 91.0 mm (3.6 in) |
| 1959 | 113.8 mm (4.5 in) |
| 1960 | 120.0 mm (4.7 in) |
| 1961 | 110.0 mm (4.3 in) |
| 1962 | 174.1 mm (6.9 in) |
| 1963 | 65.0 mm (2.6 in) |
| 1964 | 86.3 mm (3.4 in) |
| 1965 | 54.7 mm (2.2 in) |
| 1966 | 84.6 mm (3.3 in) |
| 1967 | 126.7 mm (5.0 in) |
| 1968 | 166.6 mm (6.6 in) |
| 1969 | 158.6 mm (6.2 in) |
| 1970 | 98.7 mm (3.9 in) |
| 1971 | 103.3 mm (4.1 in) |
| 1972 | 116.4 mm (4.6 in) |
| 1973 | 173.5 mm (6.8 in) |
| 1974 | 81.1 mm (3.2 in) |
| 1975 | 131.0 mm (5.2 in) |
| 1976 | 191.5 mm (7.5 in) |
| 1977 | 125.8 mm (5.0 in) |
| 1978 | 183.0 mm (7.2 in) |
| 1979 | 134.4 mm (5.3 in) |
| 1980 | 100.1 mm (3.9 in) |
| 1981 | 87.9 mm (3.5 in) |
| 1982 | 131.0 mm (5.2 in) |
| 1983 | 168.6 mm (6.6 in) |
| 1984 | 116.8 mm (4.6 in) |
| 1985 | 117.3 mm (4.6 in) |
| 1986 | 68.1 mm (2.7 in) |
| 1987 | 101.5 mm (4.0 in) |
| 1988 | 120.4 mm (4.7 in) |
| 1989 | 91.2 mm (3.6 in) |
| 1990 | 199.0 mm (7.8 in) |
| 1991 | 129.6 mm (5.1 in) |
| 1992 | 82.8 mm (3.3 in) |
| 1993 | 105.4 mm (4.1 in) |
| 1994 | 95.6 mm (3.8 in) |
| 1995 | 81.3 mm (3.2 in) |
| 1996 | 163.8 mm (6.4 in) |
| 1997 | 153.7 mm (6.1 in) |
| 1998 | 168.0 mm (6.6 in) |
| 1999 | 130.6 mm (5.1 in) |
| 2000 | 93.7 mm (3.7 in) |
| 2001 | 116.5 mm (4.6 in) |
| 2002 | 99.2 mm (3.9 in) |
| 2003 | 88.8 mm (3.5 in) |
| 2004 | 89.4 mm (3.5 in) |
| 2005 | 175.5 mm (6.9 in) |
| 2006 | 157.2 mm (6.2 in) |
| 2007 | 122.2 mm (4.8 in) |
| 2008 | 149.6 mm (5.9 in) |
| 2009 | 99.1 mm (3.9 in) |
| 2010 | 166.8 mm (6.6 in) |
| 2011 | 101.9 mm (4.0 in) |
| 2012 | 86.6 mm (3.4 in) |
| 2013 | 166.6 mm (6.6 in) |
| 2014 | 138.2 mm (5.4 in) |
| 2015 | 130.0 mm (5.1 in) |
| 2016 | 73.6 mm (2.9 in) |
| 2017 | 102.9 mm (4.1 in) |
| 2018 | 128.0 mm (5.0 in) |
| 2019 | 97.6 mm (3.8 in) |
| 2020 | 88.4 mm (3.5 in) |
| 2021 | 166.2 mm (6.5 in) |
| 2022 | 80.0 mm (3.1 in) |
| 2023 | 88.1 mm (3.5 in) |
| 2024 | 124.2 mm (4.9 in) |
| 2025 | 102.2 mm (4.0 in) |
| 2026 | 190.5 mm (7.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1900 | 2 days |
| 1901 | 2 days |
| 1951 | 8 days |
| 1952 | 20 days |
| 1953 | 16 days |
| 1954 | 20 days |
| 1955 | 13 days |
| 1956 | 14 days |
| 1957 | 16 days |
| 1958 | 21 days |
| 1959 | 15 days |
| 1960 | 12 days |
| 1961 | 15 days |
| 1962 | 14 days |
| 1963 | 24 days |
| 1964 | 29 days |
| 1965 | 15 days |
| 1966 | 14 days |
| 1967 | 22 days |
| 1968 | 26 days |
| 1969 | 21 days |
| 1970 | 15 days |
| 1971 | 22 days |
| 1972 | 12 days |
| 1973 | 14 days |
| 1974 | 19 days |
| 1975 | 17 days |
| 1976 | 20 days |
| 1977 | 17 days |
| 1978 | 23 days |
| 1979 | 18 days |
| 1980 | 26 days |
| 1981 | 16 days |
| 1982 | 19 days |
| 1983 | 15 days |
| 1984 | 19 days |
| 1985 | 16 days |
| 1986 | 13 days |
| 1987 | 18 days |
| 1988 | 14 days |
| 1989 | 17 days |
| 1990 | 13 days |
| 1991 | 16 days |
| 1992 | 15 days |
| 1993 | 19 days |
| 1994 | 21 days |
| 1995 | 37 days |
| 1996 | 12 days |
| 1997 | 18 days |
| 1998 | 15 days |
| 1999 | 19 days |
| 2000 | 14 days |
| 2001 | 25 days |
| 2002 | 12 days |
| 2003 | 14 days |
| 2004 | 13 days |
| 2005 | 15 days |
| 2006 | 19 days |
| 2007 | 28 days |
| 2008 | 17 days |
| 2009 | 13 days |
| 2010 | 15 days |
| 2011 | 18 days |
| 2012 | 24 days |
| 2013 | 23 days |
| 2014 | 13 days |
| 2015 | 15 days |
| 2016 | 10 days |
| 2017 | 12 days |
| 2018 | 14 days |
| 2019 | 20 days |
| 2020 | 17 days |
| 2021 | 17 days |
| 2022 | 26 days |
| 2023 | 21 days |
| 2024 | 14 days |
| 2025 | 18 days |
| 2026 | 10 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
71 years with a frostAcross 71 years with a frost, the median last spring frost at Rochester falls on 24 April and the median first autumn frost on 16 October, which leaves a median of 175 days between them.
In 1991 to 2025 the median growing season was 186 days. That is 26 days more than in 1900 to 1979.
Fitted over all years, the growing season changes by +4.9 days per decade at this station.
| Measure | Median, all years | Earliest period (1900 to 1979) | Recent period (1991 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 April | 4 May | 19 April | 15 days earlier | -2.5 days per decade |
| First autumn frost | 16 October | 10 October | 27 October | 17 days later | +2.4 days per decade |
| Growing days | 175 days | 160 days | 186 days | 26 days more | +4.9 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
71 years, 1952 to 2025A day with at least 76.0 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 170.3 mm (6.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 76.0 mm (3.0 in) | |
| 5 years | 100.8 mm (4.0 in) | |
| 10 years | 117.4 mm (4.6 in) | |
| 25 years | 138.6 mm (5.5 in) | |
| 50 years | 154.4 mm (6.1 in) | |
| 100 years | 170.3 mm (6.7 in) | Longer than the 71 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, 71 years of values from 1952 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: 171.5 mm (6.8 in) in 1990; 162.6 mm (6.4 in) in 2021; 148.8 mm (5.9 in) in 1976.
Station Changes
3 suspected3 changes were suspected in the annual mean temperature of Rochester, at 1976, 1991 and 2015. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1976 ran 0.3 C (0.5 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1991 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 2015 ran 0.5 C (0.9 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1976 | +0.3 | +0.5 | likely | 5 |
| 1991 | +0.2 | +0.4 | possible | 5 |
| 2015 | -0.5 | -0.9 | 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
2010 to 2025 against 1961 to 1990Over 2010 to 2025, Rochester had a mean temperature of 10.8 C (51.5 F) and 1,323.0 mm (52.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Patchogue 2 N (United States, 206 km away), Greenport Pwr House (United States, 143 km away) and Suwa (Japan, 10,870 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Patchogue 2 N | United States | 206 km (128 mi) | 10.9 C (51.6 F) | 1,235.2 mm (48.6 in) | 0.54 |
| Greenport Pwr House | United States | 143 km (89 mi) | 10.9 C (51.6 F) | 1,172.5 mm (46.2 in) | 0.87 |
| Suwa | Japan | 10,870 km (6,754 mi) | 10.9 C (51.5 F) | 1,332.6 mm (52.5 in) | 0.88 |
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).