Rochester Intl AP Threshold Days by Year (USW00014925)

20 fixed thresholds counted per year at Rochester Intl AP (USW00014925): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rochester Intl AP Thresholds

Rochester Intl AP: days with a maximum temperature at or above 30 C (86 F) in 108 years, most in 1931 with 55.
Rochester Intl AP: days with a maximum temperature at or below 0 C (32 F) in 108 years, most in 1978 with 110.
Rochester Intl AP: nights with a minimum temperature at or below 0 C (32 F) in 108 years, most in 1917 with 193.
Rochester Intl AP: nights with a minimum temperature at or below -10 C (14 F) in 108 years, most in 1937 with 102.
20 fixed thresholds have at least one qualifying day at Rochester Intl AP.

Days at or above 30 C (86 F)

108 years with a qualifying day

Days per year at Rochester Intl AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 55 in 1931.

Days at or above 30 C (86 F) per year at Rochester Intl AP
Year	Days	Decade average
1910	48	34.8
1911	37	34.8
1912	28	34.8
1913	43	34.8
1914	49	34.8
1915	13	34.8
1916	45	34.8
1917	25	34.8
1918	27	34.8
1919	33	34.8
1929	26	26
1930	44	43.1
1931	55	43.1
1932	38	43.1
1933	45	43.1
1934	51	43.1
1935	31	43.1
1936	55	43.1
1937	43	43.1
1938	22	43.1
1939	47	43.1
1940	29	34.7
1941	42	34.7
1942	18	34.7
1943	43	34.7
1944	30	34.7
1945	23	34.7
1946	25	34.7
1947	46	34.7
1948	46	34.7
1949	45	34.7
1950	22	27.6
1951	10	27.6
1952	40	27.6
1953	30	27.6
1954	24	27.6
1955	51	27.6
1956	30	27.6
1957	19	27.6
1958	13	27.6
1959	37	27.6
1960	22	16.4
1961	17	16.4
1962	11	16.4
1963	19	16.4
1964	35	16.4
1965	8	16.4
1966	22	16.4
1967	5	16.4
1968	13	16.4
1969	12	16.4
1970	22	26.2
1971	23	26.2
1972	26	26.2
1973	18	26.2
1974	23	26.2
1975	43	26.2
1976	42	26.2
1977	16	26.2
1978	25	26.2
1979	24	26.2
1980	34	24.9
1981	10	24.9
1982	16	24.9
1983	45	24.9
1984	15	24.9
1985	17	24.9
1986	12	24.9
1987	31	24.9
1988	51	24.9
1989	18	24.9
1990	9	12.5
1991	28	12.5
1992	7	12.5
1993	6	12.5
1994	11	12.5
1995	20	12.5
1996	9	12.5
1997	7	12.5
1998	11	12.5
1999	17	12.5
2000	10	17.4
2001	24	17.4
2002	26	17.4
2003	17	17.4
2004	5	17.4
2005	27	17.4
2006	20	17.4
2007	31	17.4
2008	7	17.4
2009	7	17.4
2010	21	18.7
2011	21	18.7
2012	46	18.7
2013	24	18.7
2014	4	18.7
2015	7	18.7
2016	11	18.7
2017	22	18.7
2018	24	18.7
2019	7	18.7
2020	22	21.6
2021	27	21.6
2022	16	21.6
2023	31	21.6
2024	16	21.6
2025	15	21.6
2026	24	21.6

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

First to last qualifying date each year at Rochester Intl AP
Year	First date	Last date
1910	1910-04-29	1910-09-20
1911	1911-05-11	1911-09-02
1912	1912-05-23	1912-10-06
1913	1913-05-01	1913-09-08
1914	1914-05-26	1914-09-22
1915	1915-06-06	1915-09-07
1916	1916-05-07	1916-10-08
1917	1917-05-17	1917-09-18
1918	1918-05-04	1918-08-25
1919	1919-05-28	1919-09-20
1929	1929-05-28	1929-09-03
1930	1930-06-02	1930-09-24
1931	1931-05-15	1931-09-20
1932	1932-05-14	1932-08-30
1933	1933-06-05	1933-09-09
1934	1934-04-30	1934-08-18
1935	1935-06-13	1935-09-24
1936	1936-05-16	1936-09-22
1937	1937-06-24	1937-09-24
1938	1938-06-15	1938-09-24
1939	1939-04-25	1939-09-16
1940	1940-05-12	1940-09-20
1941	1941-05-26	1941-09-21
1942	1942-06-05	1942-09-11
1943	1943-05-05	1943-09-27
1944	1944-05-29	1944-09-17
1945	1945-06-22	1945-09-07
1946	1946-06-07	1946-08-17
1947	1947-06-26	1947-10-14
1948	1948-05-20	1948-09-19
1949	1949-05-03	1949-08-26
1950	1950-06-05	1950-08-24
1951	1951-07-07	1951-08-30
1952	1952-04-28	1952-09-30
1953	1953-05-29	1953-10-02
1954	1954-06-11	1954-09-01
1955	1955-05-02	1955-09-18
1956	1956-05-12	1956-09-25
1957	1957-06-16	1957-09-01
1958	1958-06-28	1958-08-19
1959	1959-05-01	1959-09-08
1960	1960-07-20	1960-09-07
1961	1961-06-10	1961-09-10
1962	1962-05-16	1962-08-21
1963	1963-06-03	1963-10-06
1964	1964-05-21	1964-09-02
1965	1965-07-04	1965-08-17
1966	1966-05-26	1966-08-30
1967	1967-05-26	1967-08-01
1968	1968-06-04	1968-08-23
1969	1969-05-27	1969-08-30
1970	1970-04-29	1970-08-27
1971	1971-06-04	1971-09-07
1972	1972-05-17	1972-08-28
1973	1973-06-08	1973-08-29
1974	1974-06-20	1974-08-20
1975	1975-05-19	1975-09-10
1976	1976-06-06	1976-10-01
1977	1977-04-27	1977-08-27
1978	1978-05-26	1978-09-11
1979	1979-05-17	1979-08-31
1980	1980-04-21	1980-09-08
1981	1981-06-05	1981-09-10
1982	1982-06-28	1982-08-19
1983	1983-06-10	1983-09-09
1984	1984-06-26	1984-09-19
1985	1985-04-18	1985-09-07
1986	1986-05-31	1986-08-25
1987	1987-05-09	1987-09-05
1988	1988-05-28	1988-09-17
1989	1989-06-06	1989-08-22
1990	1990-06-12	1990-09-06
1991	1991-04-06	1991-08-30
1992	1992-05-01	1992-08-09
1993	1993-08-10	1993-08-26
1994	1994-04-18	1994-09-13
1995	1995-06-16	1995-08-30
1996	1996-05-17	1996-08-06
1997	1997-06-22	1997-10-06
1998	1998-05-14	1998-09-19
1999	1999-06-05	1999-09-03
2000	2000-05-04	2000-09-18
2001	2001-05-14	2001-08-08
2002	2002-04-15	2002-09-30
2003	2003-04-14	2003-09-08
2004	2004-04-28	2004-07-21
2005	2005-06-06	2005-10-03
2006	2006-05-28	2006-07-31
2007	2007-04-29	2007-10-06
2008	2008-06-20	2008-07-29
2009	2009-04-24	2009-06-26
2010	2010-05-24	2010-10-09
2011	2011-05-10	2011-09-12
2012	2012-05-18	2012-09-11
2013	2013-05-14	2013-09-10
2014	2014-05-26	2014-08-24
2015	2015-06-09	2015-09-04
2016	2016-05-06	2016-08-10
2017	2017-05-16	2017-09-24
2018	2018-05-24	2018-09-17
2019	2019-05-31	2019-09-30
2020	2020-06-01	2020-08-27
2021	2021-05-01	2021-09-19
2022	2022-05-09	2022-09-20
2023	2023-04-12	2023-10-02
2024	2024-05-12	2024-09-21
2025	2025-05-12	2025-10-04
2026	2026-05-15	2026-10-12

Every Fixed Threshold

Fixed thresholds at Rochester Intl AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	108	55	1931	24
35 C (95 F): Days	57	19	1934	1
40 C (104 F): Days	3	6	1936	6
90 F (32.2 C): Days	103	38	1934	6
100 F (37.8 C): Days	14	12	1936	1
0 C (32 F): Ice days (max	108	110	1978	42
0 C (32 F): Frost days (min	108	193	1917	91
-10 C (14 F): Days with min	108	102	1937	36
-20 C (-4 F): Days with min	108	54	1978	10
-30 C (-22 F): Days with min	66	13	1912	1
-40 C (-40 F): Days with min	1	1	1951	1
20 C (68 F): Tropical nights (min	106	25	1955	13
25 C (77 F): Days with min	9	2	1911	1
10 mm (0.39 in): Days with 10 mm or more rain	106	38	1911	21
25 mm (0.98 in): Days with 25 mm or more rain	106	16	2019	11
50 mm (1.97 in): Days with 50 mm or more rain	76	5	2000	2
100 mm (3.94 in): Days with 100 mm or more rain	11	2	1978	1
10 cm (3.9 in): Days with 10 cm or more snowfall	86	10	2019	2
25 cm (9.8 in): Days with 25 cm or more snowfall	14	2	1934	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 1910.

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Data for Rochester Intl AP 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 Intl AP Threshold Days by Year (USW00014925)

Key Facts for Rochester Intl AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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