Tucson WFO Threshold Days by Year (USC00028815)

16 fixed thresholds counted per year at Tucson WFO (USC00028815): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tucson WFO Thresholds

Tucson WFO: days with 10 mm (0.39 in) or more of precipitation in 111 years, most in 1905 with 24.
Tucson WFO: days with a maximum temperature at or above 30 C (86 F) in 110 years, most in 1950 with 210.
Tucson WFO: days with a maximum temperature at or above 35 C (95 F) in 110 years, most in 1989 with 149.
Tucson WFO: days with a maximum temperature at or above 40 C (104 F) in 110 years, most in 1994 with 51.
16 fixed thresholds have at least one qualifying day at Tucson WFO.

Days at or above 30 C (86 F)

110 years with a qualifying day

Days per year at Tucson WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 210 in 1950.

Days at or above 30 C (86 F) per year at Tucson WFO
Year	Days	Decade average
1895	176	168.5
1897	183	168.5
1898	153	168.5
1899	162	168.5
1900	170	171.3
1901	178	171.3
1902	183	171.3
1903	165	171.3
1904	178	171.3
1905	142	171.3
1906	175	171.3
1907	171	171.3
1908	170	171.3
1909	181	171.3
1910	199	168.6
1911	178	168.6
1912	153	168.6
1913	165	168.6
1914	164	168.6
1915	154	168.6
1916	184	168.6
1917	171	168.6
1918	168	168.6
1919	150	168.6
1920	153	171.8
1921	165	171.8
1922	170	171.8
1923	167	171.8
1924	187	171.8
1925	181	171.8
1926	165	171.8
1927	178	171.8
1928	176	171.8
1929	176	171.8
1930	167	177
1931	178	177
1932	171	177
1933	161	177
1934	205	177
1935	160	177
1936	179	177
1937	192	177
1938	175	177
1939	182	177
1940	170	174.1
1941	155	174.1
1942	168	174.1
1943	186	174.1
1944	171	174.1
1945	176	174.1
1946	176	174.1
1947	177	174.1
1948	180	174.1
1949	182	174.1
1950	210	186.1
1951	182	186.1
1952	194	186.1
1953	184	186.1
1954	198	186.1
1955	178	186.1
1956	195	186.1
1957	161	186.1
1958	176	186.1
1959	183	186.1
1960	183	188.8
1961	183	188.8
1962	198	188.8
1963	190	188.8
1964	181	188.8
1966	199	188.8
1967	200	188.8
1968	187	188.8
1969	178	188.8
1970	162	183.9
1971	180	183.9
1972	207	183.9
1973	190	183.9
1974	189	183.9
1975	172	183.9
1976	181	183.9
1977	185	183.9
1978	193	183.9
1979	180	183.9
1980	180	178.3
1981	178	178.3
1982	171	178.3
1983	150	178.3
1984	171	178.3
1985	174	178.3
1986	180	178.3
1987	175	178.3
1988	197	178.3
1989	207	178.3
1990	185	181.3
1991	174	181.3
1992	194	181.3
1993	186	181.3
1994	173	181.3
1995	184	181.3
1996	193	181.3
1998	154	181.3
1999	189	181.3
2000	177	180.8
2001	187	180.8
2002	178	180.8
2003	178	180.8
2004	184	180.8
2005	173	180.8
2006	176	180.8
2007	193	180.8

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

First to last qualifying date each year at Tucson WFO
Year	First date	Last date
1895	1895-03-24	1895-10-28
1897	1897-04-10	1897-11-21
1898	1898-04-09	1898-11-19
1899	1899-03-07	1899-11-12
1900	1900-03-09	1900-11-07
1901	1901-03-01	1901-10-26
1902	1902-04-05	1902-10-29
1903	1903-04-08	1903-11-23
1904	1904-02-24	1904-11-24
1905	1905-05-15	1905-10-29
1906	1906-02-27	1906-11-16
1907	1907-03-17	1907-10-17
1908	1908-03-13	1908-11-07
1909	1909-04-02	1909-11-24
1910	1910-03-02	1910-11-02
1911	1911-03-09	1911-10-25
1912	1912-04-29	1912-11-10
1913	1913-03-31	1913-10-29
1914	1914-03-17	1914-10-18
1915	1915-04-03	1915-10-30
1916	1916-03-10	1916-11-04
1917	1917-03-28	1917-11-23
1918	1918-03-31	1918-11-11
1919	1919-03-31	1919-10-16
1920	1920-04-30	1920-10-15
1921	1921-02-24	1921-10-31
1922	1922-04-20	1922-10-26
1923	1923-04-10	1923-10-30
1924	1924-04-19	1924-11-22
1925	1925-02-03	1925-10-10
1926	1926-04-23	1926-10-28
1927	1927-01-04	1927-11-20
1928	1928-03-20	1928-11-12
1929	1929-03-29	1929-10-22
1930	1930-04-05	1930-11-01
1931	1931-03-22	1931-11-07
1932	1932-04-02	1932-10-28
1933	1933-03-11	1933-11-16
1934	1934-03-06	1934-11-14
1935	1935-04-11	1935-11-02
1936	1936-03-20	1936-11-16
1937	1937-04-08	1937-11-05
1938	1938-04-04	1938-10-30
1939	1939-03-16	1939-11-04
1940	1940-03-24	1940-11-02
1941	1941-04-24	1941-10-19
1942	1942-03-31	1942-10-22
1943	1943-02-20	1943-10-28
1944	1944-04-04	1944-10-23
1945	1945-04-07	1945-11-04
1946	1946-03-10	1946-10-22
1947	1947-03-25	1947-11-01
1948	1948-04-08	1948-10-26
1949	1949-03-15	1949-11-30
1950	1950-03-22	1950-11-29
1951	1951-02-09	1951-10-24
1952	1952-04-04	1952-11-06
1953	1953-01-10	1953-11-30
1954	1954-02-24	1954-10-31
1955	1955-03-08	1955-11-20
1956	1956-03-17	1956-11-12
1957	1957-02-12	1957-10-11
1958	1958-04-15	1958-11-09
1959	1959-04-01	1959-10-28
1960	1960-03-06	1960-11-03
1961	1961-03-09	1961-10-25
1962	1962-02-10	1962-11-13
1963	1963-02-04	1963-11-13
1964	1964-03-30	1964-11-08
1966	1966-03-14	1966-11-20
1967	1967-02-13	1967-11-18
1968	1968-02-26	1968-11-12
1969	1969-03-28	1969-10-27
1970	1970-04-06	1970-12-07
1971	1971-01-19	1971-11-11
1972	1972-02-19	1972-10-16
1973	1973-04-10	1973-12-01
1974	1974-02-28	1974-10-20
1975	1975-04-15	1975-11-14
1976	1976-03-22	1976-11-09
1977	1977-03-22	1977-11-27
1978	1978-03-17	1978-11-09
1979	1979-04-05	1979-10-27
1980	1980-02-27	1980-11-09
1981	1981-02-19	1981-11-24
1982	1982-02-22	1982-10-30
1983	1983-04-17	1983-10-23
1984	1984-03-20	1984-11-06
1985	1985-03-24	1985-11-04
1986	1986-02-24	1986-10-31
1987	1987-01-27	1987-10-28
1988	1988-03-20	1988-11-07
1989	1989-02-23	1989-11-11
1990	1990-03-20	1990-11-14
1991	1991-04-05	1991-11-08
1992	1992-03-25	1992-10-27
1993	1993-03-20	1993-10-26
1994	1994-03-16	1994-10-29
1995	1995-03-16	1995-11-25
1996	1996-03-09	1996-11-19
1998	1998-03-24	1998-10-20
1999	1999-01-24	1999-11-29
2000	2000-04-04	2000-10-18
2001	2001-03-20	2001-11-04
2002	2002-03-21	2002-10-16
2003	2003-03-26	2003-10-25
2004	2004-03-08	2004-10-16
2005	2005-03-11	2005-11-10
2006	2006-04-03	2006-11-08
2007	2007-03-07	2007-11-19

Every Fixed Threshold

Fixed thresholds at Tucson WFO
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	110	210	1950	193
35 C (95 F): Days	110	149	1989	102
40 C (104 F): Days	110	51	1994	22
45 C (113 F): Days	6	5	1968	2
90 F (32.2 C): Days	110	179	1952	155
100 F (37.8 C): Days	110	92	1994	60
110 F (43.3 C): Days	55	7	1968	2
0 C (32 F): Frost days (min	105	65	1917	7
-10 C (14 F): Days with min	4	2	1913	2
20 C (68 F): Tropical nights (min	110	144	1994	132
25 C (77 F): Days with min	110	99	1994	46
10 mm (0.39 in): Days with 10 mm or more rain	111	24	1905	8
25 mm (0.98 in): Days with 25 mm or more rain	88	5	1914	4
50 mm (1.97 in): Days with 50 mm or more rain	19	1	1898	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1983	1
10 cm (3.9 in): Days with 10 cm or more snowfall	5	1	1908	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1895.

Download the Data

Data for Tucson WFO 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Tucson WFO Threshold Days by Year (USC00028815)

Key Facts for Tucson WFO Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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