Maricopa Threshold Days by Year (USC00045338)

14 fixed thresholds counted per year at Maricopa (USC00045338): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Maricopa Thresholds

Maricopa: days with a maximum temperature at or above 30 C (86 F) in 71 years, most in 1917 with 176.
Maricopa: days with a maximum temperature at or above 35 C (95 F) in 71 years, most in 1918 with 130.
Maricopa: days with a maximum temperature at or above 40 C (104 F) in 71 years, most in 1917 with 66.
Maricopa: days with a maximum temperature at or above 90 F (32.2 C) in 71 years, most in 1918 with 154.
14 fixed thresholds have at least one qualifying day at Maricopa.

Days at or above 30 C (86 F)

71 years with a qualifying day

Days per year at Maricopa with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 176 in 1917.

Days at or above 30 C (86 F) per year at Maricopa
Year	Days	Decade average
1912	114	141.6
1913	138	141.6
1914	119	141.6
1915	136	141.6
1916	161	141.6
1917	176	141.6
1918	166	141.6
1919	123	141.6
1920	114	134.8
1921	131	134.8
1922	139	134.8
1923	117	134.8
1924	141	134.8
1925	122	134.8
1926	147	134.8
1927	141	134.8
1928	150	134.8
1929	146	134.8
1930	124	142.6
1931	160	142.6
1932	140	142.6
1933	143	142.6
1934	156	142.6
1935	138	142.6
1936	159	142.6
1937	136	142.6
1938	132	142.6
1939	138	142.6
1940	143	132.3
1941	119	132.3
1942	136	132.3
1943	136	132.3
1944	130	132.3
1945	132	132.3
1946	136	132.3
1947	138	132.3
1948	119	132.3
1949	134	132.3
1950	133	132.4
1951	144	132.4
1952	132	132.4
1953	107	132.4
1954	130	132.4
1955	136	132.4
1956	137	132.4
1957	124	132.4
1958	138	132.4
1959	143	132.4
1960	146	127.9
1961	132	127.9
1962	139	127.9
1963	121	127.9
1964	137	127.9
1965	106	127.9
1966	139	127.9
1968	126	127.9
1969	105	127.9
1970	130	123.4
1971	122	123.4
1973	131	123.4
1974	142	123.4
1975	129	123.4
1976	94	123.4
1977	119	123.4
1978	120	123.4
1983	111	126
1984	135	126
1985	133	126
1986	125	126
1990	139	140.5
1991	142	140.5

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

First to last qualifying date each year at Maricopa
Year	First date	Last date
1912	1912-05-12	1912-10-18
1913	1913-04-10	1913-11-10
1914	1914-03-20	1914-10-29
1915	1915-04-12	1915-11-01
1916	1916-03-10	1916-10-28
1917	1917-02-22	1917-11-04
1918	1918-03-16	1918-11-06
1919	1919-04-29	1919-10-23
1920	1920-04-28	1920-09-07
1921	1921-04-29	1921-10-18
1922	1922-05-02	1922-10-25
1923	1923-03-27	1923-10-13
1924	1924-03-01	1924-11-04
1925	1925-02-11	1925-10-28
1926	1926-03-23	1926-11-09
1927	1927-04-21	1927-10-24
1928	1928-03-18	1928-10-20
1929	1929-03-05	1929-11-05
1930	1930-02-18	1930-11-07
1931	1931-04-04	1931-11-07
1932	1932-03-31	1932-10-29
1933	1933-04-02	1933-10-26
1934	1934-03-10	1934-10-28
1935	1935-05-05	1935-10-10
1936	1936-03-04	1936-11-19
1937	1937-04-21	1937-10-30
1938	1938-04-18	1938-10-26
1939	1939-04-06	1939-10-31
1940	1940-04-11	1940-10-20
1941	1941-05-07	1941-11-08
1942	1942-04-19	1942-10-23
1943	1943-04-30	1943-10-26
1944	1944-04-02	1944-10-28
1945	1945-04-17	1945-10-15
1946	1946-03-09	1946-10-14
1947	1947-03-15	1947-10-05
1948	1948-04-14	1948-10-22
1949	1949-04-10	1949-11-06
1950	1950-04-17	1950-10-15
1951	1951-03-15	1951-10-15
1952	1952-04-04	1952-10-07
1953	1953-04-05	1953-10-09
1954	1954-04-15	1954-10-16
1955	1955-05-10	1955-10-26
1956	1956-04-09	1956-10-03
1957	1957-04-04	1957-10-10
1958	1958-04-20	1958-10-18
1959	1959-04-02	1959-10-25
1960	1960-03-19	1960-10-23
1961	1961-04-02	1961-10-19
1962	1962-04-11	1962-10-23
1963	1963-05-16	1963-10-14
1964	1964-03-29	1964-10-22
1965	1965-03-30	1965-10-31
1966	1966-03-31	1966-11-02
1968	1968-03-31	1968-10-29
1969	1969-03-30	1969-10-01
1970	1970-05-02	1970-10-12
1971	1971-04-06	1971-10-15
1973	1973-04-26	1973-10-20
1974	1974-04-14	1974-10-19
1975	1975-05-13	1975-10-07
1976	1976-05-02	1976-10-15
1977	1977-04-06	1977-10-17
1978	1978-05-09	1978-10-24
1983	1983-05-15	1983-10-28
1984	1984-04-14	1984-10-27
1985	1985-04-01	1985-10-06
1986	1986-01-29	1986-10-10
1990	1990-04-03	1990-10-25
1991	1991-03-03	1991-11-08

Every Fixed Threshold

Fixed thresholds at Maricopa
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	71	176	1917	142
35 C (95 F): Days	71	130	1918	76
40 C (104 F): Days	71	66	1917	14
45 C (113 F): Days	16	10	1931	1
90 F (32.2 C): Days	71	154	1918	123
100 F (37.8 C): Days	71	94	1917	35
110 F (43.3 C): Days	46	20	1917	4
0 C (32 F): Frost days (min	69	54	1916	32
20 C (68 F): Tropical nights (min	69	91	1945	57
25 C (77 F): Days with min	68	33	1959	17
10 mm (0.39 in): Days with 10 mm or more rain	58	9	1941	2
25 mm (0.98 in): Days with 25 mm or more rain	29	2	1933	2
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1913	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1978	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

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Data for Maricopa 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).

Maricopa Threshold Days by Year (USC00045338)

Key Facts for Maricopa Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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