Tempe Threshold Days by Year (USC00028489)

13 fixed thresholds counted per year at Tempe (USC00028489): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tempe Thresholds

Tempe: days with a maximum temperature at or above 30 C (86 F) in 58 years, most in 1950 with 224.
Tempe: days with a maximum temperature at or above 35 C (95 F) in 58 years, most in 1952 with 154.
Tempe: days with a maximum temperature at or above 40 C (104 F) in 58 years, most in 1960 with 85.
Tempe: days with a maximum temperature at or above 90 F (32.2 C) in 58 years, most in 1950 with 192.
13 fixed thresholds have at least one qualifying day at Tempe.

Days at or above 30 C (86 F)

58 years with a qualifying day

Days per year at Tempe with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 224 in 1950.

Days at or above 30 C (86 F) per year at Tempe
Year	Days	Decade average
1926	174	182.5
1927	186	182.5
1928	192	182.5
1929	178	182.5
1930	178	181.9
1931	193	181.9
1932	173	181.9
1933	166	181.9
1934	202	181.9
1935	157	181.9
1936	189	181.9
1937	190	181.9
1938	172	181.9
1939	199	181.9
1940	192	182.2
1941	154	182.2
1942	171	182.2
1943	194	182.2
1944	175	182.2
1945	189	182.2
1946	177	182.2
1947	184	182.2
1948	185	182.2
1949	201	182.2
1950	224	190.3
1951	179	190.3
1952	196	190.3
1953	181	190.3
1954	204	190.3
1955	187	190.3
1956	197	190.3
1957	158	190.3
1958	184	190.3
1959	193	190.3
1960	193	184.8
1961	189	184.8
1962	197	184.8
1963	195	184.8
1964	181	184.8
1965	185	184.8
1966	188	184.8
1967	178	184.8
1968	185	184.8
1969	157	184.8
1970	168	184.2
1971	181	184.2
1972	201	184.2
1973	184	184.2
1974	189	184.2
1975	173	184.2
1976	180	184.2
1977	181	184.2
1978	195	184.2
1979	190	184.2
1980	189	185.8
1981	198	185.8
1982	179	185.8
1983	177	185.8

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

First to last qualifying date each year at Tempe
Year	First date	Last date
1926	1926-03-15	1926-10-29
1927	1927-03-24	1927-10-24
1928	1928-03-14	1928-11-12
1929	1929-03-05	1929-10-22
1930	1930-02-18	1930-11-04
1931	1931-03-22	1931-11-06
1932	1932-02-29	1932-10-17
1933	1933-04-01	1933-10-29
1934	1934-03-06	1934-11-11
1935	1935-04-13	1935-10-27
1936	1936-03-10	1936-10-29
1937	1937-04-12	1937-11-03
1938	1938-04-12	1938-10-30
1939	1939-03-15	1939-11-04
1940	1940-03-22	1940-10-25
1941	1941-04-25	1941-11-07
1942	1942-03-31	1942-11-10
1943	1943-02-20	1943-11-16
1944	1944-04-02	1944-11-04
1945	1945-04-07	1945-11-05
1946	1946-03-11	1946-10-26
1947	1947-03-26	1947-11-02
1948	1948-04-10	1948-10-28
1949	1949-03-19	1949-12-02
1950	1950-01-21	1950-12-11
1951	1951-02-11	1951-10-30
1952	1952-04-03	1952-11-07
1953	1953-03-25	1953-11-30
1954	1954-02-05	1954-11-13
1955	1955-03-09	1955-11-07
1956	1956-03-18	1956-11-11
1957	1957-02-13	1957-10-11
1958	1958-04-16	1958-11-11
1959	1959-04-02	1959-10-29
1960	1960-03-07	1960-11-04
1961	1961-03-10	1961-10-27
1962	1962-03-27	1962-11-13
1963	1963-02-04	1963-11-13
1964	1964-03-29	1964-10-30
1965	1965-04-01	1965-11-08
1966	1966-03-14	1966-11-02
1967	1967-03-17	1967-11-15
1968	1968-03-28	1968-10-30
1969	1969-03-28	1969-10-17
1970	1970-04-06	1970-10-31
1971	1971-01-20	1971-11-12
1972	1972-02-28	1972-10-17
1973	1973-04-11	1973-11-13
1974	1974-03-16	1974-10-26
1975	1975-04-22	1975-11-06
1976	1976-03-23	1976-11-08
1977	1977-02-20	1977-11-04
1978	1978-03-18	1978-11-09
1979	1979-04-06	1979-10-29
1980	1980-04-09	1980-12-17
1981	1981-02-20	1981-11-17
1982	1982-02-22	1982-10-26
1983	1983-04-01	1983-11-04

Every Fixed Threshold

Fixed thresholds at Tempe
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	58	224	1950	177
35 C (95 F): Days	58	154	1952	123
40 C (104 F): Days	58	85	1960	66
45 C (113 F): Days	33	11	1960	1
90 F (32.2 C): Days	58	192	1950	149
100 F (37.8 C): Days	58	130	1978	100
110 F (43.3 C): Days	55	26	1960	10
0 C (32 F): Frost days (min	58	55	1948	11
20 C (68 F): Tropical nights (min	58	99	1981	83
25 C (77 F): Days with min	58	40	1981	32
10 mm (0.39 in): Days with 10 mm or more rain	57	14	1941	10
25 mm (0.98 in): Days with 25 mm or more rain	34	5	1941	4
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1951	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1926.

Download the Data

Data for Tempe 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).

Tempe Threshold Days by Year (USC00028489)

Key Facts for Tempe Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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