Experiment Threshold Days by Year (USC00093271)

16 fixed thresholds counted per year at Experiment (USC00093271): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Experiment Thresholds

Experiment: days with a maximum temperature at or above 30 C (86 F) in 91 years, most in 1962 with 125.
Experiment: days with a maximum temperature at or above 90 F (32.2 C) in 91 years, most in 1954 with 96.
Experiment: nights with a minimum temperature at or below 0 C (32 F) in 90 years, most in 1968 with 78.
Experiment: nights with a minimum temperature at or above 20 C (68 F) in 90 years, most in 1911 with 135.
16 fixed thresholds have at least one qualifying day at Experiment.

Days at or above 30 C (86 F)

91 years with a qualifying day

Days per year at Experiment with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 125 in 1962.

Days at or above 30 C (86 F) per year at Experiment
Year	Days	Decade average
1901	96	88.2
1902	100	88.2
1903	78	88.2
1904	91	88.2
1905	101	88.2
1906	88	88.2
1907	88	88.2
1908	81	88.2
1909	71	88.2
1910	73	83.3
1911	109	83.3
1912	73	83.3
1913	78	83.3
1926	102	89.5
1927	102	89.5
1928	69	89.5
1929	85	89.5
1930	96	98.3
1931	124	98.3
1932	85	98.3
1933	118	98.3
1934	107	98.3
1935	112	98.3
1936	112	98.3
1937	92	98.3
1938	69	98.3
1939	68	98.3
1940	78	87.1
1941	123	87.1
1942	81	87.1
1943	94	87.1
1944	83	87.1
1945	82	87.1
1946	63	87.1
1947	91	87.1
1948	98	87.1
1949	78	87.1
1950	88	100.1
1951	112	100.1
1952	96	100.1
1953	93	100.1
1954	118	100.1
1955	106	100.1
1956	98	100.1
1957	85	100.1
1958	107	100.1
1959	98	100.1
1960	106	88
1961	72	88
1962	125	88
1963	87	88
1964	88	88
1965	99	88
1966	71	88
1967	66	88
1968	82	88
1969	84	88
1970	97	80.5
1971	73	80.5
1972	73	80.5
1973	89	80.5
1974	63	80.5
1975	111	80.5
1976	53	80.5
1977	94	80.5
1978	97	80.5
1979	55	80.5
1980	103	80.5
1981	81	80.5
1982	68	80.5
1983	64	80.5
1984	76	80.5
1985	69	80.5
1986	103	80.5
1987	86	80.5
1988	86	80.5
1989	69	80.5
1990	100	81.6
1991	70	81.6
1992	54	81.6
1993	96	81.6
1994	51	81.6
1995	82	81.6
1996	86	81.6
1997	73	81.6
1998	116	81.6
1999	88	81.6
2000	98	86.5
2001	86	86.5
2002	97	86.5
2003	65	86.5

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

First to last qualifying date each year at Experiment
Year	First date	Last date
1901	1901-05-01	1901-09-16
1902	1902-04-30	1902-09-28
1903	1903-05-20	1903-09-27
1904	1904-05-23	1904-10-11
1905	1905-04-28	1905-10-19
1906	1906-04-25	1906-09-22
1907	1907-03-20	1907-09-21
1908	1908-04-09	1908-09-14
1909	1909-05-17	1909-10-04
1910	1910-05-03	1910-10-20
1911	1911-05-10	1911-10-08
1912	1912-05-23	1912-09-18
1913	1913-04-19	1913-09-03
1926	1926-05-09	1926-10-19
1927	1927-04-18	1927-10-24
1928	1928-04-02	1928-10-10
1929	1929-03-24	1929-09-18
1930	1930-02-25	1930-09-25
1931	1931-05-03	1931-10-25
1932	1932-05-06	1932-09-18
1933	1933-05-06	1933-10-02
1934	1934-05-09	1934-10-24
1935	1935-03-23	1935-11-02
1936	1936-04-15	1936-10-27
1937	1937-04-19	1937-09-07
1938	1938-05-19	1938-10-19
1939	1939-05-12	1939-10-24
1940	1940-04-02	1940-10-27
1941	1941-04-20	1941-10-23
1942	1942-04-26	1942-09-19
1943	1943-04-28	1943-09-15
1944	1944-05-14	1944-10-07
1945	1945-05-27	1945-09-28
1946	1946-06-08	1946-09-11
1947	1947-05-14	1947-09-22
1948	1948-04-15	1948-09-22
1949	1949-05-05	1949-09-18
1950	1950-05-04	1950-10-15
1951	1951-04-27	1951-10-07
1952	1952-05-02	1952-10-03
1953	1953-05-12	1953-10-13
1954	1954-05-30	1954-10-15
1955	1955-04-17	1955-10-08
1956	1956-05-02	1956-09-17
1957	1957-04-29	1957-09-23
1958	1958-04-24	1958-10-11
1959	1959-05-02	1959-10-07
1960	1960-04-24	1960-10-04
1961	1961-06-01	1961-09-29
1962	1962-05-01	1962-10-16
1963	1963-05-07	1963-10-22
1964	1964-05-12	1964-09-24
1965	1965-04-10	1965-09-24
1966	1966-05-30	1966-09-28
1967	1967-04-04	1967-10-08
1968	1968-05-25	1968-10-02
1969	1969-05-21	1969-10-04
1970	1970-04-23	1970-10-04
1971	1971-04-21	1971-10-06
1972	1972-04-16	1972-09-30
1973	1973-05-12	1973-10-06
1974	1974-03-11	1974-09-22
1975	1975-05-03	1975-10-13
1976	1976-04-20	1976-08-30
1977	1977-04-17	1977-09-16
1978	1978-04-08	1978-09-24
1979	1979-06-03	1979-09-08
1980	1980-04-24	1980-09-27
1981	1981-05-26	1981-10-07
1982	1982-05-17	1982-10-11
1983	1983-07-01	1983-09-18
1984	1984-05-07	1984-10-19
1985	1985-05-13	1985-10-12
1986	1986-04-27	1986-10-06
1987	1987-04-22	1987-09-19
1988	1988-04-06	1988-09-26
1989	1989-04-28	1989-10-07
1990	1990-05-01	1990-10-08
1991	1991-05-16	1991-09-19
1992	1992-05-20	1992-09-21
1993	1993-05-08	1993-09-27
1994	1994-05-16	1994-09-08
1995	1995-05-09	1995-09-18
1996	1996-05-06	1996-09-13
1997	1997-05-19	1997-09-22
1998	1998-05-14	1998-10-05
1999	1999-04-04	1999-10-04
2000	2000-05-08	2000-09-26
2001	2001-04-11	2001-09-24
2002	2002-04-18	2002-10-07
2003	2003-05-07	2003-09-21

Every Fixed Threshold

Fixed thresholds at Experiment
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	91	125	1962	65
35 C (95 F): Days	79	40	1954	7
40 C (104 F): Days	1	1	1930	1
90 F (32.2 C): Days	91	96	1954	8
100 F (37.8 C): Days	23	10	1930	1
0 C (32 F): Ice days (max	51	11	1940	1
0 C (32 F): Frost days (min	90	78	1968	54
-10 C (14 F): Days with min	61	10	1970	2
-20 C (-4 F): Days with min	1	2	1985	2
20 C (68 F): Tropical nights (min	90	135	1911	61
25 C (77 F): Days with min	13	2	1902	1
10 mm (0.39 in): Days with 10 mm or more rain	89	56	1953	48
25 mm (0.98 in): Days with 25 mm or more rain	89	23	1936	16
50 mm (1.97 in): Days with 50 mm or more rain	80	12	1929	7
100 mm (3.94 in): Days with 100 mm or more rain	23	2	1971	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1994	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

Data for Experiment 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).

Experiment Threshold Days by Year (USC00093271)

Key Facts for Experiment Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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