Ajo Threshold Days by Year (USC00020080)

15 fixed thresholds counted per year at Ajo (USC00020080): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ajo Thresholds

Ajo: days with 10 mm (0.39 in) or more of precipitation in 104 years, most in 1932 with 14.
Ajo: days with a maximum temperature at or above 30 C (86 F) in 88 years, most in 2017 with 223.
Ajo: days with a maximum temperature at or above 35 C (95 F) in 88 years, most in 2020 with 170.
Ajo: days with a maximum temperature at or above 40 C (104 F) in 88 years, most in 2024 with 110.
15 fixed thresholds have at least one qualifying day at Ajo.

Days at or above 30 C (86 F)

88 years with a qualifying day

Days per year at Ajo with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 223 in 2017.

Days at or above 30 C (86 F) per year at Ajo
Year	Days	Decade average
1915	163	171.8
1916	183	171.8
1917	174	171.8
1918	177	171.8
1919	162	171.8
1920	152	174.4
1921	177	174.4
1922	177	174.4
1923	160	174.4
1924	186	174.4
1925	171	174.4
1926	176	174.4
1927	179	174.4
1928	187	174.4
1929	179	174.4
1930	181	185.9
1931	194	185.9
1932	189	185.9
1933	167	185.9
1934	217	185.9
1935	158	185.9
1936	197	185.9
1937	187	185.9
1938	176	185.9
1939	193	185.9
1940	185	172.5
1941	156	172.5
1942	161	172.5
1943	190	172.5
1944	166	172.5
1945	178	172.5
1946	159	172.5
1947	178	172.5
1948	177	172.5
1949	175	172.5
1950	195	182.5
1951	169	182.5
1952	191	182.5
1953	175	182.5
1954	197	182.5
1955	173	182.5
1956	194	182.5
1957	161	182.5
1958	182	182.5
1959	188	182.5
1960	181	181.3
1961	178	181.3
1962	190	181.3
1963	187	181.3
1964	176	181.3
1965	177	181.3
1966	191	181.3
1967	181	181.3
1968	176	181.3
1969	176	181.3
1970	169	173.7
1971	172	173.7
1972	198	173.7
1973	179	173.7
1974	174	173.7
1975	157	173.7
1976	168	173.7
1977	171	173.7
1978	171	173.7
1979	178	173.7
1980	167	161.8
1981	166	161.8
1982	159	161.8
1983	149	161.8
1984	161	161.8
1985	169	161.8
2010	173	196.3
2011	189	196.3
2012	200	196.3
2013	192	196.3
2014	202	196.3
2015	183	196.3
2016	216	196.3
2017	223	196.3
2018	187	196.3
2019	198	196.3
2020	199	200
2021	202	200
2022	199	200
2023	197	200
2024	192	200
2025	223	200
2026	188	200

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

First to last qualifying date each year at Ajo
Year	First date	Last date
1915	1915-04-03	1915-11-06
1916	1916-03-10	1916-11-03
1917	1917-03-29	1917-11-05
1918	1918-03-26	1918-11-13
1919	1919-04-01	1919-10-20
1920	1920-04-07	1920-10-12
1921	1921-02-25	1921-11-04
1922	1922-04-19	1922-10-23
1923	1923-04-09	1923-10-21
1924	1924-04-19	1924-11-23
1925	1925-03-05	1925-10-29
1926	1926-04-22	1926-10-29
1927	1927-03-24	1927-11-19
1928	1928-03-21	1928-11-13
1929	1929-03-06	1929-10-23
1930	1930-02-09	1930-11-05
1931	1931-03-22	1931-11-07
1932	1932-03-25	1932-11-26
1933	1933-03-12	1933-11-27
1934	1934-03-07	1934-11-15
1935	1935-04-07	1935-10-28
1936	1936-03-09	1936-11-16
1937	1937-03-10	1937-11-05
1938	1938-04-03	1938-10-30
1939	1939-03-16	1939-11-07
1940	1940-03-21	1940-10-26
1941	1941-04-25	1941-11-10
1942	1942-03-31	1942-10-23
1943	1943-03-27	1943-11-18
1944	1944-04-03	1944-10-24
1945	1945-04-08	1945-11-05
1946	1946-03-10	1946-10-24
1947	1947-03-26	1947-11-02
1948	1948-04-09	1948-10-27
1949	1949-04-14	1949-11-26
1950	1950-02-26	1950-11-26
1951	1951-02-11	1951-10-25
1952	1952-04-05	1952-11-09
1953	1953-03-25	1953-11-14
1954	1954-02-25	1954-11-11
1955	1955-04-10	1955-11-01
1956	1956-03-18	1956-11-12
1957	1957-02-14	1957-10-11
1958	1958-04-16	1958-12-05
1959	1959-04-02	1959-10-29
1960	1960-03-07	1960-11-03
1961	1961-03-14	1961-10-27
1962	1962-02-11	1962-11-13
1963	1963-02-05	1963-11-14
1964	1964-03-29	1964-10-30
1965	1965-04-17	1965-11-10
1966	1966-03-13	1966-11-04
1967	1967-03-17	1967-11-19
1968	1968-03-28	1968-10-30
1969	1969-03-29	1969-10-29
1970	1970-04-07	1970-11-25
1971	1971-02-16	1971-11-12
1972	1972-02-28	1972-10-17
1973	1973-04-13	1973-11-13
1974	1974-03-16	1974-10-22
1975	1975-05-04	1975-11-08
1976	1976-03-23	1976-11-08
1977	1977-02-21	1977-11-27
1978	1978-03-27	1978-11-09
1979	1979-04-15	1979-10-29
1980	1980-04-10	1980-11-30
1981	1981-02-20	1981-11-06
1982	1982-02-22	1982-10-26
1983	1983-04-24	1983-11-01
1984	1984-04-13	1984-11-06
1985	1985-04-03	1985-11-05
2010	2010-04-16	2010-11-07
2011	2011-03-11	2011-11-02
2012	2012-03-16	2012-11-25
2013	2013-03-14	2013-11-15
2014	2014-02-14	2014-11-29
2015	2015-03-12	2015-11-03
2016	2016-02-12	2016-11-16
2017	2017-02-11	2017-12-03
2018	2018-03-22	2018-11-06
2019	2019-03-27	2019-11-19
2020	2020-04-23	2020-11-22
2021	2021-03-06	2021-12-02
2022	2022-02-13	2022-11-01
2023	2023-04-08	2023-11-14
2024	2024-04-10	2024-10-28
2025	2025-02-03	2025-12-22
2026	2026-02-01	2026-10-08

Every Fixed Threshold

Fixed thresholds at Ajo
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	88	223	2017	188
35 C (95 F): Days	88	170	2020	144
40 C (104 F): Days	88	110	2024	81
45 C (113 F): Days	43	23	2023	15
90 F (32.2 C): Days	88	197	2017	167
100 F (37.8 C): Days	88	139	2020	107
110 F (43.3 C): Days	83	56	2024	38
120 F (48.9 C): Days	1	1	2025	1
0 C (32 F): Frost days (min	70	27	1920	2
20 C (68 F): Tropical nights (min	88	154	2020	131
25 C (77 F): Days with min	88	100	2024	79
10 mm (0.39 in): Days with 10 mm or more rain	104	14	1932	2
25 mm (0.98 in): Days with 25 mm or more rain	84	6	1940	2
50 mm (1.97 in): Days with 50 mm or more rain	12	2	1946	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1946	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1915.

Download the Data

Data for Ajo 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).

Ajo Threshold Days by Year (USC00020080)

Key Facts for Ajo Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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