Tiffin Threshold Days by Year

17 fixed thresholds counted per year at Tiffin (USC00338313): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tiffin Thresholds

Tiffin: days with a maximum temperature at or above 30 C (86 F) in 115 years, most in 1936 with 77.
Tiffin: days with a maximum temperature at or below 0 C (32 F) in 115 years, most in 2010 with 65.
Tiffin: nights with a minimum temperature at or below 0 C (32 F) in 115 years, most in 1983 with 157.
Tiffin: nights with a minimum temperature at or below -10 C (14 F) in 115 years, most in 1978 with 54.
17 fixed thresholds have at least one qualifying day at Tiffin.

Days at or above 30 C (86 F)

115 years with a qualifying day

Days per year at Tiffin with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 1936.

Days at or above 30 C (86 F) per year at Tiffin
Year	Days	Decade average
1894	49	44.3
1895	57	44.3
1896	31	44.3
1897	42	44.3
1898	39	44.3
1899	48	44.3
1900	46	31.1
1901	46	31.1
1902	28	31.1
1903	27	31.1
1904	13	31.1
1905	18	31.1
1906	44	31.1
1907	17	31.1
1908	46	31.1
1909	26	31.1
1910	38	40.9
1911	43	40.9
1912	18	40.9
1913	33	40.9
1914	60	40.9
1915	21	40.9
1916	56	40.9
1917	26	40.9
1918	53	40.9
1919	61	40.9
1920	31	45.7
1921	69	45.7
1922	52	45.7
1923	50	45.7
1924	36	45.7
1925	58	45.7
1926	40	45.7
1927	34	45.7
1928	47	45.7
1929	40	45.7
1930	70	61.9
1931	62	61.9
1932	64	61.9
1933	66	61.9
1934	76	61.9
1935	48	61.9
1936	77	61.9
1937	44	61.9
1938	49	61.9
1939	63	61.9
1940	55	51.8
1941	69	51.8
1942	48	51.8
1943	54	51.8
1944	68	51.8
1945	42	51.8
1946	43	51.8
1947	43	51.8
1948	44	51.8
1949	52	51.8
1950	25	46.8
1951	28	46.8
1952	57	46.8
1953	60	46.8
1954	54	46.8
1955	66	46.8
1956	43	46.8
1957	37	46.8
1958	22	46.8
1959	76	46.8
1961	30	34.4
1962	39	34.4
1963	33	34.4
1964	49	34.4
1965	30	34.4
1966	37	34.4
1967	24	34.4
1968	35	34.4
1969	33	34.4
1970	44	32.7
1971	34	32.7
1972	15	32.7
1973	34	32.7
1974	27	32.7
1975	30	32.7
1976	24	32.7
1977	43	32.7
1978	46	32.7
1979	30	32.7
1980	52	41.3
1981	33	41.3
1982	37	41.3
1983	66	41.3
1985	25	41.3
1986	30	41.3
1987	51	41.3
1988	58	41.3
1989	20	41.3
1990	25	36.2
1991	61	36.2
1992	14	36.2
1993	42	36.2
1994	38	36.2
1995	38	36.2
1996	34	36.2
1997	18	36.2
1998	42	36.2
1999	50	36.2
2000	16	35.6
2001	43	35.6
2002	63	35.6
2003	17	35.6
2004	23	35.6
2005	58	35.6
2006	31	35.6
2007	57	35.6
2008	35	35.6
2009	13	35.6
2010	53	53

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

First to last qualifying date each year at Tiffin
Year	First date	Last date
1894	1894-06-09	1894-09-14
1895	1895-05-04	1895-09-22
1896	1896-04-17	1896-09-11
1897	1897-06-13	1897-10-15
1898	1898-06-06	1898-10-03
1899	1899-04-30	1899-09-07
1900	1900-05-14	1900-09-26
1901	1901-06-11	1901-09-07
1902	1902-05-04	1902-09-08
1903	1903-05-17	1903-09-15
1904	1904-05-25	1904-09-11
1905	1905-06-05	1905-09-19
1906	1906-05-16	1906-09-19
1907	1907-06-21	1907-08-19
1908	1908-05-25	1908-09-27
1909	1909-06-23	1909-09-14
1910	1910-06-17	1910-09-05
1911	1911-05-10	1911-09-02
1912	1912-05-23	1912-09-11
1913	1913-05-05	1913-10-09
1914	1914-05-25	1914-09-22
1915	1915-04-24	1915-09-16
1916	1916-05-26	1916-10-08
1917	1917-05-18	1917-08-21
1918	1918-05-05	1918-08-31
1919	1919-05-29	1919-10-03
1920	1920-06-02	1920-10-19
1921	1921-05-20	1921-09-29
1922	1922-06-06	1922-10-06
1923	1923-06-01	1923-09-27
1924	1924-06-19	1924-09-21
1925	1925-04-23	1925-09-20
1926	1926-05-07	1926-09-22
1927	1927-05-09	1927-10-02
1928	1928-05-04	1928-10-13
1929	1929-05-28	1929-09-29
1930	1930-04-11	1930-09-22
1931	1931-05-18	1931-09-22
1932	1932-05-15	1932-09-19
1933	1933-05-24	1933-09-26
1934	1934-05-04	1934-09-26
1935	1935-06-13	1935-09-25
1936	1936-05-07	1936-09-23
1937	1937-05-26	1937-09-24
1938	1938-04-27	1938-09-12
1939	1939-05-06	1939-10-09
1940	1940-05-13	1940-09-21
1941	1941-04-13	1941-10-06
1942	1942-04-26	1942-09-18
1943	1943-05-30	1943-09-05
1944	1944-05-12	1944-09-20
1945	1945-06-14	1945-09-23
1946	1946-06-11	1946-10-07
1947	1947-06-10	1947-10-16
1948	1948-04-25	1948-09-19
1949	1949-05-05	1949-10-10
1950	1950-05-25	1950-08-28
1951	1951-06-01	1951-10-05
1952	1952-05-05	1952-10-01
1953	1953-05-25	1953-10-03
1954	1954-05-31	1954-10-02
1955	1955-05-03	1955-09-19
1956	1956-05-13	1956-09-14
1957	1957-06-06	1957-09-02
1958	1958-06-05	1958-09-06
1959	1959-05-02	1959-10-03
1961	1961-06-01	1961-09-24
1962	1962-04-30	1962-09-13
1963	1963-05-09	1963-10-07
1964	1964-05-19	1964-09-11
1965	1965-05-08	1965-09-21
1966	1966-05-27	1966-09-03
1967	1967-05-27	1967-08-03
1968	1968-06-06	1968-09-23
1969	1969-05-28	1969-09-01
1970	1970-05-22	1970-09-24
1971	1971-06-04	1971-09-28
1972	1972-06-14	1972-09-17
1973	1973-06-03	1973-09-27
1974	1974-06-09	1974-08-27
1975	1975-05-19	1975-08-25
1976	1976-06-07	1976-09-09
1977	1977-05-16	1977-09-09
1978	1978-05-28	1978-09-21
1979	1979-05-08	1979-07-31
1980	1980-05-05	1980-09-22
1981	1981-05-24	1981-08-13
1982	1982-05-07	1982-09-15
1983	1983-06-11	1983-09-20
1985	1985-04-22	1985-09-09
1986	1986-04-28	1986-09-30
1987	1987-05-15	1987-09-11
1988	1988-05-16	1988-08-18
1989	1989-05-31	1989-08-06
1990	1990-04-26	1990-09-07
1991	1991-05-13	1991-09-17
1992	1992-05-13	1992-08-27
1993	1993-05-12	1993-09-15
1994	1994-04-27	1994-09-17
1995	1995-06-08	1995-09-07
1996	1996-05-19	1996-09-04
1997	1997-06-20	1997-10-06
1998	1998-05-15	1998-09-27
1999	1999-05-18	1999-09-29
2000	2000-05-07	2000-09-04
2001	2001-06-12	2001-09-10
2002	2002-04-17	2002-09-20
2003	2003-06-24	2003-08-29
2004	2004-05-07	2004-09-24
2005	2005-06-05	2005-09-23
2006	2006-05-29	2006-08-27
2007	2007-05-16	2007-10-09
2008	2008-06-06	2008-09-15
2009	2009-04-26	2009-08-20
2010	2010-05-27	2010-10-11

Every Fixed Threshold

Fixed thresholds at Tiffin
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	115	77	1936	53
35 C (95 F): Days	79	22	1933	2
40 C (104 F): Days	5	4	1936	1
90 F (32.2 C): Days	114	51	1934	25
100 F (37.8 C): Days	17	10	1936	5
0 C (32 F): Ice days (max	115	65	2010	65
0 C (32 F): Frost days (min	115	157	1983	136
-10 C (14 F): Days with min	115	54	1978	31
-20 C (-4 F): Days with min	81	13	1917	6
20 C (68 F): Tropical nights (min	115	41	2002	27
25 C (77 F): Days with min	11	2	1896	1
10 mm (0.39 in): Days with 10 mm or more rain	109	47	1950	46
25 mm (0.98 in): Days with 25 mm or more rain	109	14	2007	16
50 mm (1.97 in): Days with 50 mm or more rain	60	5	1981	4
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1894	1
10 cm (3.9 in): Days with 10 cm or more snowfall	57	5	1950	4
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1894	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Tiffin 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Tiffin Threshold Days by Year

Key Facts for Tiffin Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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