Rochester Threshold Days by Year (USC00196938)

17 fixed thresholds counted per year at Rochester (USC00196938): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rochester Thresholds

Rochester: days with a maximum temperature at or above 30 C (86 F) in 74 years, most in 1983 with 46.
Rochester: days with a maximum temperature at or below 0 C (32 F) in 74 years, most in 1901 with 45.
Rochester: nights with a minimum temperature at or below 0 C (32 F) in 73 years, most in 1965 with 171.
Rochester: nights with a minimum temperature at or below -10 C (14 F) in 73 years, most in 1962 with 51.
17 fixed thresholds have at least one qualifying day at Rochester.

Days at or above 30 C (86 F)

74 years with a qualifying day

Days per year at Rochester with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 1983.

Days at or above 30 C (86 F) per year at Rochester
Year	Days	Decade average
1900	29	19.5
1901	10	19.5
1952	24	19
1953	22	19
1954	9	19
1955	28	19
1956	14	19
1957	17	19
1958	7	19
1959	31	19
1960	9	15
1961	21	15
1962	8	15
1963	16	15
1964	13	15
1965	19	15
1966	19	15
1967	6	15
1968	19	15
1969	20	15
1970	16	22
1971	17	22
1972	13	22
1973	32	22
1974	28	22
1975	30	22
1976	22	22
1977	28	22
1978	16	22
1979	18	22
1980	31	25.8
1981	23	25.8
1982	15	25.8
1983	46	25.8
1984	26	25.8
1985	25	25.8
1986	14	25.8
1987	23	25.8
1988	32	25.8
1989	23	25.8
1990	22	26.6
1991	41	26.6
1993	25	26.6
1994	23	26.6
1995	31	26.6
1996	15	26.6
1997	27	26.6
1998	22	26.6
1999	33	26.6
2000	20	24.1
2001	23	24.1
2003	24	24.1
2004	17	24.1
2005	31	24.1
2006	26	24.1
2007	30	24.1
2008	24	24.1
2009	22	24.1
2010	36	26.1
2012	27	26.1
2013	24	26.1
2014	11	26.1
2015	26	26.1
2016	33	26.1
2017	15	26.1
2018	36	26.1
2019	27	26.1
2020	30	23.6
2021	25	23.6
2022	27	23.6
2023	15	23.6
2024	21	23.6
2025	26	23.6
2026	21	23.6

For each year, a bar from the first to the last day at Rochester meeting 30 C (86 F).

First to last qualifying date each year at Rochester
Year	First date	Last date
1900	1900-05-15	1900-09-12
1901	1901-06-28	1901-07-31
1952	1952-06-26	1952-09-14
1953	1953-06-07	1953-09-05
1954	1954-06-21	1954-08-17
1955	1955-06-17	1955-08-23
1956	1956-06-01	1956-08-29
1957	1957-04-22	1957-09-14
1958	1958-07-01	1958-09-27
1959	1959-05-13	1959-09-24
1960	1960-06-28	1960-09-09
1961	1961-06-03	1961-09-13
1962	1962-04-28	1962-08-09
1963	1963-06-25	1963-07-30
1964	1964-05-09	1964-08-31
1965	1965-05-11	1965-09-23
1966	1966-06-06	1966-09-03
1967	1967-06-11	1967-08-19
1968	1968-06-07	1968-08-26
1969	1969-06-14	1969-09-03
1970	1970-05-11	1970-09-24
1971	1971-06-09	1971-09-10
1972	1972-07-03	1972-08-27
1973	1973-06-09	1973-09-05
1974	1974-05-18	1974-09-14
1975	1975-05-21	1975-08-28
1976	1976-04-18	1976-09-15
1977	1977-05-18	1977-09-04
1978	1978-05-21	1978-08-31
1979	1979-05-10	1979-10-23
1980	1980-05-23	1980-09-23
1981	1981-05-26	1981-09-15
1982	1982-07-09	1982-09-12
1983	1983-06-13	1983-09-21
1984	1984-06-06	1984-09-01
1985	1985-05-12	1985-09-22
1986	1986-05-19	1986-08-10
1987	1987-05-11	1987-08-21
1988	1988-06-13	1988-08-16
1989	1989-06-03	1989-09-12
1990	1990-04-28	1990-09-03
1991	1991-05-13	1991-09-18
1993	1993-05-12	1993-09-07
1994	1994-05-24	1994-08-28
1995	1995-06-01	1995-09-02
1996	1996-05-21	1996-09-05
1997	1997-06-11	1997-08-18
1998	1998-05-27	1998-08-31
1999	1999-05-30	1999-08-30
2000	2000-05-08	2000-09-02
2001	2001-05-03	2001-09-08
2003	2003-04-17	2003-08-28
2004	2004-05-08	2004-09-05
2005	2005-06-09	2005-09-14
2006	2006-06-02	2006-08-17
2007	2007-05-25	2007-10-06
2008	2008-06-08	2008-09-05
2009	2009-04-27	2009-08-27
2010	2010-04-08	2010-09-03
2012	2012-05-30	2012-09-01
2013	2013-05-31	2013-09-12
2014	2014-06-19	2014-09-07
2015	2015-07-09	2015-09-18
2016	2016-05-29	2016-09-15
2017	2017-05-19	2017-08-17
2018	2018-05-03	2018-09-07
2019	2019-05-27	2019-08-23
2020	2020-06-21	2020-09-05
2021	2021-05-24	2021-08-28
2022	2022-05-22	2022-08-26
2023	2023-04-15	2023-09-08
2024	2024-06-19	2024-08-29
2025	2025-06-06	2025-08-13
2026	2026-05-18	2026-09-11

Every Fixed Threshold

Fixed thresholds at Rochester
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	74	46	1983	21
35 C (95 F): Days	44	7	1999	2
90 F (32.2 C): Days	72	25	1991	8
100 F (37.8 C): Days	6	2	1991	1
0 C (32 F): Ice days (max	74	45	1901	19
0 C (32 F): Frost days (min	73	171	1965	78
-10 C (14 F): Days with min	73	51	1962	25
-20 C (-4 F): Days with min	33	10	1961	3
20 C (68 F): Tropical nights (min	72	38	1900	12
25 C (77 F): Days with min	4	5	1900	1
10 mm (0.39 in): Days with 10 mm or more rain	72	59	1983	24
25 mm (0.98 in): Days with 25 mm or more rain	72	26	2018	9
50 mm (1.97 in): Days with 50 mm or more rain	64	9	1953	4
100 mm (3.94 in): Days with 100 mm or more rain	16	2	2005	1
10 cm (3.9 in): Days with 10 cm or more snowfall	46	7	1970	2
25 cm (9.8 in): Days with 25 cm or more snowfall	20	2	2003	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	2005	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

Data for Rochester threshold days by year: CSV or JSON. Field meanings are on the data page.

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Rochester Threshold Days by Year (USC00196938)

Key Facts for Rochester Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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